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Journal articles on the topic 'Existing bridge structure'
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1
Koteš, Peter, Miroslav Brodňan, and František Bahleda. "Diagnostics of Corrosion on a Real Bridge Structure." Advances in Materials Science and Engineering 2016 (2016): 1–10. http://dx.doi.org/10.1155/2016/2125604.
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Real bridge structures are affected by environmental conditions. The environmental loads in time cause the degradation of concrete and reinforcement. The diagnostics of real state of existing bridges are very important due to actual degradation and corrosion. In the frame of research activities of Department of Structures and Bridges, Civil Engineering Faculty, University of Žilina, the real bridge structure was observed for a few years. It is girder reinforced concrete bridge near town of Žilina in Slovakia. The results of diagnostics which focused on reinforcement corrosion are presented. The paper deals with reinforcement corrosion and its influence on the moment resistance of the existing concrete structures.
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An, Xin Zheng, Cheng Yi, and Rui Xue Du. "Performance Deterioration Behavior of Existing Reinforced Concrete Bridges." Advanced Materials Research 79-82 (August 2009): 1367–70. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.1367.
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The analyses of concrete from a bridge in Handan district shows that most bridges concrete should have cracked. The study of the technical measures against the performance deterioration of existing reinforced concrete bridges will undoubtedly become an imperative issue. In recent years, lots of bridges have been built in Handan. We choose a reinforced concrete bridge to investigate the effect of the effective member stiffness degradation and durability degradation induced by vehicle overload, vehicle overflow, rebar corrosion, and concrete deterioration on highway reinforced concrete bridges. And Static loading test was conducted at its middle span. Based on the test data in different circumstances, the seriousness of vehicle overload is discussed. In consequence, the performance of highway reinforced concrete bridges on stiffness degradation and durability degradation is more serious compared with the bridge under the condition of non-overloading. The results show that the process of rebar corrosion in highway reinforced concrete bridges is sped up under the condition of vehicle overload and vehicle overflow on the highway reinforced concrete bridges, which decreases the durability of the bridge structure, and the speed of the durability degradation increases as time goes on. The paper conclusion is instructive for the construction and maintenance of bridge.
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Oleszek, R., and W. Radomski. "Dynamic Analysis of an Existing Arch Railway Bridge According to Eurocodes." Archives of Civil Engineering 62, no. 4 (December 1, 2016): 99–118. http://dx.doi.org/10.1515/ace-2015-0100.
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AbstractModern regulations concerning railway bridges are based on the approach of structural dynamics, which is described in PN-EN standards. This paper presents the results of theoretical dynamic analysis of the HSLM-A train set loading on the structure of a pre-stressed concrete arch bridge - the first railway bridge of its type which was built in Poland (completed in 1959). The recommendations of PN-EN have been followed and modal analysis was carried out to define the sensitivity of the structure to chosen eigenforms. Additionally the paper presents a course of calculations and the conclusions obtained from the analysis of displacements, accelerations, and bending moments induced in the structure through a simulated passage of a high-speed train in the context of the requirements of PN-EN Standards. The conclusions from the current calculations can be used for dynamic analysis of bridges of similar structural solutions.
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Radnić, Jure, Domagoj Matešan, and Ivan Banović. "Bridges with multiple structural systems: The example of Trilj Bridge reconstruction in Croatia." Bridge Structures 17, no. 1-2 (June 11, 2021): 65–75. http://dx.doi.org/10.3233/brs-210185.
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Development of multiple structural systems for bridges is useful in the design of new bridges and rehabilitation of existing bridges. This paper briefly presents some existing bridges with multiple structural systems and succinctly discusses design ideas for bridges with such systems. As an example of a bridge with multiple structural systems, the paper presents the reconstruction of a pedestrian suspension bridge in the City of Trilj, Croatia. The new bridge’s load-bearing structure is composed of several structural systems. Namely, the reconstructed bridge is a combination of suspension, cable-stayed and stress-ribbon bridge, which is laterally restrained with horizontal tensioned ropes. Numerical analysis was conducted on the renovated bridge. The results have shown an acceptable levels of stresses and deflections verifying the structural safety of the restored bridge. It is believed that this example of the bridge renovation may be useful in the design of new and strengthening of existing similar bridges.
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Istiono, Heri, and Jaka Propika. "Analisa Non-Linier Pada Mekanisme Keruntuhan Jembatan Rangka Baja Tipe Pratt." Borneo Engineering : Jurnal Teknik Sipil 1, no. 2 (December 25, 2017): 68. http://dx.doi.org/10.35334/be.v1i2.604.
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Steel truss bridge collapse often occurs, both in Indonesia and in other countries. As a result of the collapse of the bridge is in addition to the casualties also losses from the financial aspects. This collapse caused due to various factors, one of them because of a decrease in the strength of the bridge structure. To minimize required maintenance of the bridge's collapse and to facilitate the maintenance of one of them must be known failure mechanisms existing bridges. In the analysis of this collapse, will be modeled steel truss bridge pratt’s type with long spans is 60 meters. Analysis of the collapse of the steel truss bridge's, utilizing a pushover analysis to analyze the behavior of the bridge structure. Pushover analysis done with give vertical static load pattern at the structure, next gradually increase by a factor until one vertical displacement target of the reference point is reached. The study shows that at model singe span failure occurred on the chord on mid span. The performance level of structure shows all models of bridges in the state are IO, this case based on the target displacement FEMA 356 and the actual ductility occurs in all models of bridges is compliant with SNI 2833-2008.
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Chen, Biao, and Sheng Li. "The Application of FBG-Based Overweight Vehicle Recognition for Existing Bridge." Advanced Materials Research 368-373 (October 2011): 1935–38. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.1935.
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In order to know the operation condition of bridges when they’re under the action of overweight vehicles, it’s necessary to collect the testing information of bridges under the overloaded condition. Based on the high-speed demodulation instrument, the optical fiber grating (FBG) sensor system can realize the continuous collection for the dynamic strain of structure. According to the analysis of the collected data, auto-sorting and recognition for overweight vehicles can be realized. The introductive system has been applied to the health monitoring system of no.2 Wuhan Bridge over Yangtze River (N2WB). The result showed that not only it’s able to recognize whether or not there was an overweight vehicle passing the bridge, but also it could auto-sort the grade of overweight vehicles, which was an effective overweight vehicle monitoring tool for the existing large span bridges.
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Firoj, Mohd, Sauhardra Ojha, Prince Poddar, and Sanjeew Kumar Singh. "Seismic hazard assessment of existing reinforced concrete bridge structure using pushover analysis." Journal of Structural Engineering & Applied Mechanics 3, no. 4 (December 31, 2020): 229–43. http://dx.doi.org/10.31462/jseam.2020.04229243.
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The present paper focuses on the nonlinear static pushover analysis of a 3-span existing RC bridge located in Indian seismic Zone IV as per IS1893-2016 using the Finite Element Method (FEM). The 3D model of the RC bridge is simulated using the FEM technique and pushover analysis is performed to analyze the structure for modal mass participating ratio, performance level, spectral demand, and capacity of the structure. The bridge pier and longitudinal girder are modeled using the two noded beam element and bent cap and abutment of the bridge structure is modeled using the 8 noded brick element. The base of the column is assumed fixed condition. The pushover analysis is performed using Displacement Modification (FEMA 440) and Capacity Spectrum Method (ATC 40). The outcomes of results appear that the considered bridge has inadequate capacity to cope up with any of the desired performance levels because spectral demand is greater than the spectral capacity. The modal analysis of the 3D bridge exposes that it has many closely-spaced modes. The mass participating ratio for the higher modes is not very high. After performing pushover analysis of the exiting RC bridge structure it has been concluded that the existing bridge structure does not meet seismic criteria of spectral demand as per the ATC 40 and FEMA 440, therefore retrofitting is required for bridge component i.e. piers, abutment, and bent cap.
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Mehta, Darshan J., and S. M. Yadav. "Analysis of scour depth in the case of parallel bridges using HEC-RAS." Water Supply 20, no. 8 (October 15, 2020): 3419–32. http://dx.doi.org/10.2166/ws.2020.255.
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Abstract Scour is now one of the main problems for river as well as for coastline engineering. Bridges are the vital structures which must be designed to prevent failure against the effects of scour. Scour holes can occur without warning and cause the failure of a bridge. The main significant issues in hydraulic and river engineering are to determine the connection between parameters affecting the maximum and minimum depth of scour. The scour depth in the alluvial stream below a river bed differs based on the flows, pier shape, pier size and sediment characteristics. Dual bridges of basically the same structure are placed parallel to and only a small distance away from an existing bridge, either on the upstream or downstream side. Naturally, the backwater generated by dual bridges is bigger than that of a single bridge but lower than the value resulting from separate consideration of the two bridges. In the present work, an hydraulic model is used to simulate the stability of a bridge in the study area, namely ‘Sardar Bridge’ on the Tapi river. Scour profiles for various flood events have been assessed for a particular bridge. The velocity of flow is used to estimate depths of scour at different piers and abutments. Estimating depth of the scour during the design can significantly decrease the overall cost of bridge foundation construction. Results from the present study show that construction of a new bridge should be proposed on the upstream side rather than downside side of the existing bridge. By doing so, hydraulic stability of the existing bridge is ensured.
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Gladkov, Gennady, Konstantin Morgunov, and Yuri Ivanovsky. "Model studies of flow parameters in the area of bridge supports." E3S Web of Conferences 244 (2021): 05014. http://dx.doi.org/10.1051/e3sconf/202124405014.
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The results of laboratory modeling of the influence of the bridge crossing supports erected during the construction of the highway near the existing railway bridge on the flow characteristics in the channel of the Neva River are presented. Modeling was carried out for two options for the location of the new bridge supports relative to the existing bridge structures. The limits of changes in the characteristics of the river flow are taken into account - the maximum, minimum and residual flows and benchmarks of the water level in the channel. Studies have shown that the construction of the designed bridge supports in the channel does not cause significant changes in the flow structure. There is a redistribution of the flow rate in the sections of the existing and designed bridges. The average velocities in the navigable span of the existing bridge are somewhat reduced when new supports are built. The velocity diagram is aligned along the width of the central and side spans, and a vortex wake is more clearly formed in the area behind the supports.
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Koteš, Peter, Josef Vican, and Martina Ivašková. "Influence of Reinforcement Corrosion on Reliability and Remaining Lifetime of RC Bridges." Materials Science Forum 844 (March 2016): 89–96. http://dx.doi.org/10.4028/www.scientific.net/msf.844.89.
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The evaluation of existing bridge structures is the most important process in the global Bridge Management System (BMS) because of providing the basic information about existing bridges required from the viewpoint of decision making process related to the optimal bridge maintenance and rehabilitation strategy. The theoretical approach using conditional probability and the positive effect of the inspection was developed. The new information concerning the actual structure condition is used in this mathematical model. This information is not available in the process of the new structure design [1]. The work is focused on structures subjected to bending [2]. The reinforced concrete beam elements with or without degradation were investigated. The corrosion of reinforcement bars was used as material degradation. The biggest effect of the inspection was obtained for members, which do not degrade. Hereby, the negative effect of degradation on reliability index is also demonstrated.
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Tian, Hao, Guo Ping Li, and Ai Rong Chen. "Concrete Bridge Durability Design and Maintenance." Applied Mechanics and Materials 147 (December 2011): 55–61. http://dx.doi.org/10.4028/www.scientific.net/amm.147.55.
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The fundamental approach for solving the durability deficiency is to perform the durability design for planned concrete bridges and the durability maintenance for existing concrete bridges. Most of the existing durability design and maintenance methods, however, are qualitative and contain many subjective factors, which cannot solve the problems such as whether the structure is safe or not throughout the service life. The critical problems, such as the design service life, the environmental parameters, the material degradation process, as well as the lifetime performance assessment method, are found out based on deep insight into the existing concrete bridge durability design and maintenance methods. Finally, the schematics of concrete bridge durability design and maintenance methods that can quantitatively evaluate the degradation process of concrete bridges are proposed and the further research direction is determined.
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Petzek, Edward, Luiza Toma, and Elena Meteş. "Deconstruction of Existing Railway and Highway Bridges." Advanced Materials Research 814 (September 2013): 214–21. http://dx.doi.org/10.4028/www.scientific.net/amr.814.214.
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The paper presents the damage under time dependent actions, fatigue, creep, corrosion for a railway bridge and a highway bridge. The first one is situated on the IV Pan-European Corridor, which crosses the Romanian territory. Although recently rebuilt, in the end of 80s, the bridge’s superstructure, made of decks with twin plain web girders, was in an unsatisfactory condition - loss of load bearing capacity and missing structural parts (strong corrosion and cracks). After the stress analysis and the fatigue verifications based on the Wöhler concept which were made in relation with the prescriptions of the Romanian standard SR 1911-1998, Swiss code 161 & SBB Richtlinie 2002 and the German code DS 805-2002, a life prediction analysis based on fracture mechanics principles was performed in order to evaluate the remaining fatigue life for this structure for the new traffic UIC conditions; in conclusion, the superstructure should be replaced. The highway bridge is the only crossing possibility over the Bistriţa River, parish Frânceşti, being an important element for the road infrastructure in the area. The current bridge was meant to be a temporary structure, but due to economic difficulties it wasn’t replaced. It does assure the clearance and safety according to the standards. Based on the technical situation of the existing bridge the replacement of this structure is a necessity. Taking into consideration the need of a simple technology, the limited construction height and a very short erection time, it leads in both cases to the necessity of a modular system with low costs. In this area of application the VFT-WIB® solution with its roots in the classical WIB composite structure was developed.
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Mandlik, Prof Dharmraj N. "Study of Steel Bridge and Design of its Prototype." International Journal for Research in Applied Science and Engineering Technology 9, no. VI (July 15, 2021): 700–711. http://dx.doi.org/10.22214/ijraset.2021.36428.
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The “Study of Steel Bridge and design of its prototype” is based on reviewing existing literatures, project reports and researches in steel bridge structures. The study depends upon the different aspects in design considerations of a steel bridge where its main focus is to understand the scaling law and design of a prototype of a steel bridge structure. The study includes a) Classification of bridges which helps in categorizing the bridges on basis of their structures b) Types of steels used in bridges and their strength which helps to understand the importance of types of steel, its strength and when to use it. c) Tests conducted on bridges which help in determining safety, durability and loading capacity of bridge. d) Loads on bridges to understand type of loadings a bridge has to sustain. f) To reduce the cost of experimentation a technique is used its main objective is to conduct experiments on structures at reduced scales which is known as Scaling prototype. Cost is cheap due to the dropping in the loading equipment and dropping in the cost of test structure fabrication and testing. The researchers must be watchful and pure on how far the model behaves similar to the prototype By properly applying scaling laws, it is possible to infer the behaviour of a structure from the response of a similar model whose dimensions are scaled by a factor b. In some cases, however, e.g. in case of the strain rate sensitive of structures under serves the dynamic loads, these laws become inaccurate, rigorously limits this approach. It is exposed that the behaviour of a structure, if made of mild steel, can be predicted from the response of a model. The technique used here is publicised to be valid for simple structues subjected to the transverse and axial impact loads.
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Kim, Hyunsik, Sungho Tae, Yonghan Ahn, and Jihwan Yang. "Scenarios for Life Cycle Studies of Bridge Concrete Structure Maintenance." Sustainability 12, no. 22 (November 17, 2020): 9557. http://dx.doi.org/10.3390/su12229557.
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The sustainability of structures during their construction and service life has become a widespread topic of interest. To ensure the sustainability of bridges, maintenance databases can be analyzed to determine the status changes and required maintenance of existing bridges. The results of this analysis can then be used to predict the environmental impacts and costs incurred during ongoing maintenance of new bridges to prepare accordingly for the future. To prepare for future events, this study utilizes the US National Bridge Inventory to analyze changes in the condition rating of bridge decks and substructures according to their service years, and suggests maintenance scenarios for the service life of bridge deck and substructure concrete by investigating the maintenance activities according to service years. The factors for applying the scenarios in Korea and conceptual equations for life cycle studies which apply the scenarios are discussed for further study in the life cycle assessment field of bridges.
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Zhang, Ke Chao, Jian Zhang Chen, Han Wan Jiang, and Hai Qiang Liu. "Research of Inservice Arch Bridge Superstructure Damage Status and Evaluation Index System." Applied Mechanics and Materials 361-363 (August 2013): 1358–61. http://dx.doi.org/10.4028/www.scientific.net/amm.361-363.1358.
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Scientific and integrated index system is a basic approach to accurately assess actual structure state of inservice arch bridge. It could provide clear evaluation guidance to assessment work of existing bridges. What is more, it is aimed to avoid or reduce erroneous and omission judgement phenomenon of bridge damage assessment by the grassroots-level maintenance workers. Based on summation of variety common damage in common arch bridges, this paper adopts AHP (analytic hierults are aimed to provide effective method and basis to long-term, persistent damage evaluaarchy process) method to establish arch bridge superstructure damage evaluation model with structure member (or component), the restion of inservice arch bridge.
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Perić, Dunja, Marta Miletić, Bhavik R. Shah, Asad Esmaeily, and Hongyu Wang. "Thermally induced soil structure interaction in the existing integral bridge." Engineering Structures 106 (January 2016): 484–94. http://dx.doi.org/10.1016/j.engstruct.2015.10.032.
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Zhang, Li Qun, Hong Huan Cui, and Hai Long Wang. "The Capacity Assessment about Existing Reinforced Concrete Bridge with Cracks." Advanced Materials Research 368-373 (October 2011): 2157–60. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.2157.
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Recently, bridge deterioration with time and ever increasing traffic loads raise concerns about safety and durability of aging bridges. Based on the studies about damage assessment on the level of materials and components，the author made a comparative analysis on the damage mechanism and applicable conditions，and put forward the amended formulas for calculating the flexural and shears capacity，This paper combined with results of previous studies, based on the structural damage assessment research, reinforced concrete beam structure correction formula is given in the event of cracks and shear cracks.The assessment formula for shear capacity was established as well，and in which various impact factors of shear strength was considered comprehensively.
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Peng, Wei, Wen Ya Ye, Jia Jia, Zhao Hui Lu, and Hai Tao Hou. "Reliability Assessment of Existing Reinforced Concrete Arch Bridge." Applied Mechanics and Materials 405-408 (September 2013): 1687–90. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.1687.
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A finite element model of an existing reinforced concrete arch bridge was established. The reliability index was investigated based on the PDF module in ANSYS software. Taking the maximum concrete stress and tendon stress as limit state, the limit state functions of main arch, upright column and deck are established respectively. There are taken as series system to study the bridge system reliability according to the structural characteristics of reinforced concrete arch bridge. The lowest reliability index superstructure is selected as the whole structure reliability index. Based on JC method and made-up MATLAB program, the reliability index of the example bridge is calculated.
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McIntyre, M., and A. Scanlon. "Interpretation and application of core test data in strength evaluation of existing concrete bridge structures." Canadian Journal of Civil Engineering 17, no. 3 (June 1, 1990): 471–80. http://dx.doi.org/10.1139/l90-051.
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Compressive strength tests on concrete cores taken from existing bridge structures are often used as a tool in evaluating the strength of the existing structure. Some difficulties are, however, encountered in interpreting the result of these tests and incorporating appropriate values in the usual equations for determining strength of structural members. In this paper, relationships between core tests, cylinder tests, and in situ strength are reviewed based on data reported in the literature. Methods for incorporating core test data into a limit states design approach for strength evaluation are investigated. A method is proposed to convert data from compressive strength tests on cores into an equivalent design compressive strength that can be used in the normal design equations for strength. The method is applied to the analysis of an existing bridge for which core test data are available. Key words: concrete cores, reinforced concrete, bridges, tests, compressive strength, structural evaluation.
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Han, Ji Guang, Jian Xin Xu, and Ze Min Xu. "Evolution Characteristics of Existing Bridge Safety Based on Algebraic Topology and Image Processing." Applied Mechanics and Materials 501-504 (January 2014): 1210–13. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.1210.
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This paper investigates the evolution characteristics of existing bridge safety based on algebraic topology and image analysis. Through the calculation of betti numbers of cross section in bridge pier binarization images, evolution curve of betti numbers time series is observed, which reflects the changes in internal structure of bridge piers, due to the variation of external environment. The analysis results show that when the evolution trend of the betti number appears a smooth change, the bridge pier is in safe condition, and when betti number curve appears sudden fluctuations, the internal structure of piers presents some changes. This study has positive significance for long-term monitoring of bridge safety.
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Ma, Min Jing. "Dynamic Load Test Analysis for Continuous Steel Bridge." Applied Mechanics and Materials 275-277 (January 2013): 1078–81. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.1078.
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Bridge dynamics is an important topic in the development of the modern Bridges. It not only can reflect the mechanical performance of the bridge structure under the action of vehicle load, but also reveals system influences on the bridge structure under seismic action. But in order to supplement the shortage of the pure theoretical mechanics model, we need to do some tests to improve the research that is also the most reliable method. Illustrated by the example of a viaduct (continuous steel box girder-bridge) in Taiyuan, the testing span is loaded and tested. We analyze the structure using the bridge calculation common software Midas. The existing Bridge in dynamic test loads is analyzed to research that if their vibration characteristics and dynamic response and dynamic performance can meet the requirements of normal use.
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Maleki, Shervin, and Alireza Siadat. "The Response Modification Factor for Seismic Design of Integral Abutment Bridges." Journal of Civil Engineering and Construction 10, no. 3 (August 15, 2021): 140–53. http://dx.doi.org/10.32732/jcec.2021.10.3.140.
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The response modification factor (R factor) is a crucial parameter for calculating the design seismic forces applied to a bridge structure. This factor considers the nonlinear performance of bridges during strong ground motions. Conventional bridge structures rely on the substructure components to resist earthquake forces. Accordingly, there are R factors available in the design codes based on the type of bridge substructure system. Lateral load resisting system of Integral Abutment Bridges (IABs) in the longitudinal direction is more complex than ordinary bridges. It involves the contributions from soils behind the abutments and soil/structure interaction (SSI) in addition to existing rigid connection between the superstructure and abutments. There is no R factor available in any design code throughout the world for IABs in the longitudinal direction that considers all these parameters. In this research, the Federal Emergency Management Agency publication FEMA P695 methodology has been applied to estimate the R factor for IABs. It is found that 3.5 could be a safe and valid R factor in the longitudinal direction for seismic design of such bridges.
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Au, Alexander, Clifford Lam, Akhilesh C. Agarwal, and Bala Tharmabala. "Bridge evaluation by mean load method per the Canadian Highway Bridge Design Code." Canadian Journal of Civil Engineering 32, no. 4 (August 1, 2005): 678–86. http://dx.doi.org/10.1139/l05-015.
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The Canadian Highway Bridge Design Code (CHBDC) provides two alternative methods for evaluating the strength of existing bridges. The load and resistance factor method provides a general approach and covers the most extreme load situations that can occur in a general bridge population. The mean load method considers the uncertainties of loads acting on a specific bridge, the method of analysis, and resistance of the structure involved, and thus can provide a more accurate evaluation of individual bridges. Since traffic load represents a major portion of bridge loads, a better evaluation of specific bridges is obtained by using the statistical parameters of traffic loads observed on the structure. However, the overall accuracy depends heavily on capturing the most critical loading conditions during the survey periods. The mean load method is particularly valuable where actual traffic loads are expected to be significantly lower than those used in code calibration and when the potential economic benefits arising from a more realistic evaluation outweigh the extra costs of live load data collection and analysis. This paper demonstrates that the mean load method using site-specific traffic loading information can lead to a significantly higher live load-carrying capacity of a bridge.Key words: highway bridges, bridge evaluation, reliability, mean load method, bridge testing.
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Svoboda, Adam, and Ladislav Klusáček. "Possibility of Increasing the Load Bearing Capacity of Parapet Bridge Structures." Solid State Phenomena 272 (February 2018): 319–24. http://dx.doi.org/10.4028/www.scientific.net/ssp.272.319.
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Post-tensioning is a suitable, reliable and durable method for strengthening existing reinforced concrete bridge structures. The high efficiency of post-tensioning can be seen on many implemented applications for bridge reconstructions worldwide. There are still several thousands of beam and slab bridges the load capacity of which no longer meets the demanding transport conditions. The oldest reinforced concrete beam bridges, from 1905-1915, are designed according to the Austrian Ministry of Railways Bridge Standard of 1904 when the largest load to be considered was the 18-tonne road steamroller. These bridges are not dimensioned for the currently valid traffic load values. The paper deals with the strengthening of the parapet beam bridges from the period of 1905-1930. These bridges have two main beams pulled over the bridge deck which is supported by cross beams. The cross beams connect the two main beams, forming a half-frame in the transverse direction which provides spatial rigidity of the structure. The spans of these bridges are usually in the range of 15 to 25 m.
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Liao, Jing Bo, Guang Wu Tang, and Fei Pan. "Finite Element Model Updating of Existing T-Girder Bridge by Field Quasi-Static Generalized Influence Line." Applied Mechanics and Materials 226-228 (November 2012): 1609–13. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.1609.
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Finite element model updating is the important foundation of structural damage detection, condition assessment for engineering structure. A new method, for finite element model updating based on the quasi-static generalized influence line (QSGIL) residual objection, is presented to update the finite element model of beam-structure in order to improve the quality and precision of finite element analysis. Both of the theory and model experimental study show that the proposal method can efficiently update the finite element model in the previous study [1]. In this paper, the updating techniques are further developed to update the finite element model of the existing T-Girder bridge, the QSGIL of the updating model agrees very well with the field QSGIL of the existing bridge, which illustrates that the proposal methodology is promising in the practical bridge structure and other structures.
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Yoo, Hyeonwoo, Jeongho Oh, and Sinwhan Ahn. "Field Evaluation of Load Bearing Capacity and Embedment Depth of Existing Ballastless Plate Girder Bridge Foundations." Journal of the Korean Society of Hazard Mitigation 21, no. 1 (February 28, 2021): 225–30. http://dx.doi.org/10.9798/kosham.2021.21.1.225.
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The ballastless plate girder bridge, classified as a structure type that requires an emergent replacement among domestic railway bridges, generally tends to upgrade to a ballasted track along with continuous welded rail (CWR). The axial forces of the CWR due to the temperature change need to be distributed to the bridge foundations. Because most of the existing ballastless plate girder bridges of over 50 years of age do not provide any design information, such bridge foundations are regarded as unknown foundations, and therefore, it is crucial to identify the structural adequacy and dimension. In this study, an effort was made to establish a correlation between the standard penetration test (SPT) and mid-size pneumatic cone penetration test (MPCP) to estimate the load bearing capacity of an unknown foundation. A field test was conducted to estimate the depth of the unknown foundation by employing SPT and MPCP as the source wave part. The magnitude of the shear wave was mitigated by the presence of PVC and steel pipes, such that it might be possible to identify the embedment depth of unknown foundations.
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Kim, Jin-Pal, Yang-Hoo Park, Seung-Hwan Park, and Kook-Hwan Cho. "Stability of Temporary Bridge Bearing Method Passing Underneath Existing Subway Structure." Journal of Korean Society of Hazard Mitigation 14, no. 4 (August 31, 2014): 111–18. http://dx.doi.org/10.9798/kosham.2014.14.4.111.
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MENG, Kun, Chunyi CUI, Minze XU, Qifu WANG, and Jian SU. "Vibration of the existing bridge structure induced by metro train operation." Journal of Shenzhen University Science and Engineering 37, no. 6 (November 1, 2020): 610–16. http://dx.doi.org/10.3724/sp.j.1249.2020.06610.
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Xiao, Ye, Xiaoyong Luo, Jinhong Liu, and Kun Wang. "Dynamic Response of Railway Bridges under Heavy-Haul Freight Trains." Advances in Civil Engineering 2020 (March 10, 2020): 1–13. http://dx.doi.org/10.1155/2020/7486904.
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In the freight railway bridge, the increase of the train running speed and train axle loads can enlarge dynamic response (DR) of the railway bridges, which leads to excessive vibration of bridges and endangers the structural safety. In this paper, a three-dimensional coupled finite element (FE) model of a heavy-haul freight train-track-bridge (HHFTTB) is established using multibody dynamics theory and FE method, and the DR for the coupled system of HHFTTB are solved by ABAQUS/Explicit dynamic analysis method. The field-measured data for a 32 m simply supported prestressed concrete beam of a heavy-haul railway in China are analyzed, and the validity of the FE model is verified. Finally, the effects of train formation number, train running speed, and train axle loads on DR of the heavy-haul railway bridge structures are studied. The results show that increasing the train formation number only has an influence on DR duration of the bridge structure, rather than the peak value of DR, when the train formation number exceeds a certain number; besides, the train axle loads and train running speed have significant influence on DR of the bridge structure. The results of this study can be used as reference for the design of heavy-haul railway bridges and the reinforcement transformation of existing railway bridges.
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Gugа, Nikita A., Gleb A. Averchenko, Kirill A. Vasilev, Vyacheslav A. Borisov, and Alexey M. Ismailov. "Costs planning and ways to improve bridge operation service." Transportation Systems and Technology 7, no. 2 (July 1, 2021): 30–41. http://dx.doi.org/10.17816/transsyst20217230-41.
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Repair and reconstruction is an integral part of the life cycle of such structures as: bridges, overpasses, aqueducts. Timely maintenance and repair of bridge structures contributes to the continuous improvement of their technical level, as well as to the operational state with increasing load and intensity over time on constantly under construction highways.
This article presents the results of a study of the need to repair structures over time. The article contains a description of the types of work, as well as the terms when these works need to be performed, graphs of the volume and cost of work are given. As materials and initial data, the data of approximate turnaround periods of elements of bridge structures were taken, as well as a table of the frequency of repairs by year was compiled.
Based on the collected data, graphs of the cost and changes in the volume of work were built over time. In addition, graphs of the cost of repairing individual elements of the structure are given in relation to the total cost of the structure.
Based on the results obtained, recommendations are formulated for planning the repair of expatriated bridge structures by bridge maintenance departments. A set of measures is also proposed to eliminate existing violations and further operation of the bridge structure. A set of works for the repair of individual units and structures is recommended. Arguments are given for the need to share responsibilities between bridge operation departments during the repair of the structure.
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Polak, Michal, Petr Fajman, Jiri Maca, and Tomáš Plachý. "Diagnostics of an Existing Cable-Stayed Bridge by Means of the Dynamic Load Test." Applied Mechanics and Materials 769 (June 2015): 200–205. http://dx.doi.org/10.4028/www.scientific.net/amm.769.200.
Full textAbstract:
The cable-stayed bridge at the inner ring road in Prague in the Czech Republic was put into operation in 1997. In 2008 a crack was found in the bridge structure area where the end beam was connected with the upper deck of the box section and where the bridge expansion joint system was anchored. The basic objective of diagnostic works, which were started immediately after the finding of the crack, was obtaining the basis for bridge structure modifications, among other things, to prevent formation of similar damages in the future. A series of diagnostic methods was used for determination of the bridge actual state and the real static and dynamic bridge behavior. One of these methods was the dynamic load test. It was focused on an examination of the bridge forced vibration which was caused by dynamic effects of a usual traffic flow. An arrangement of the test was not quite usual because the experiment was concentrated on dynamic behaviour of bridge support areas especially. The abutment area, the pylon area and the area of a pillar with the bearing with a tensile structural element were observed on the investigated bridge. The dynamic load test was performed in two stages. The first stage was focused on investigation of bridge dynamic behaviour in original structural conditions and on obtaining the basis for design of bridge adjustments. The second stage was realized after bridge reconstruction in December 2012 and verified the effectiveness of bridge modifications.
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Xie, Xiao-Li, Yang Huang, and Xia Qin. "Conceptual design of a new type of single-tower cable-stayed arch bridge and study of its mechanical properties." Advances in Structural Engineering 24, no. 11 (March 27, 2021): 2500–2511. http://dx.doi.org/10.1177/13694332211001506.
Full textAbstract:
In order to overcome the apparent characteristics as a flexible structure of a long-span single-tower cable-stayed bridge and the excessive axial force of the main girder, and to exert the advantages of cable-stayed arch cooperative system bridges, this paper proposes a new type of single-tower cable-stayed arch cooperative system bridge. On the premise of the same amount of steel, the new cooperative system bridge can have a greater stiffness than the existing cable-stayed arch cooperative system bridge with the same span. The new system bridge uses the main girder as the rigid tie bar to balance the arches’ thrusts, which enables the main girder to have a smaller axial force and makes the cable-stayed arch cooperative system bridge a thrustless structure. The proposed bridge is assembled by the following method: (a) constructing a cable-stayed bridge with a steel box girder to bear part of the dead load and to act as a construction platform firstly; (b) then installing arch structures and fixing they with the girder to bear the remaining dead load; and, (c) adding web members between the arch ribs and the girder to form a variable-height truss structure with the arch ribs as the upper chords and the girder as a lower chord to bear most of the live load at last. The underlying mechanical principles were explained, and the mechanical properties of the cooperative system bridges were calculated with the finite element method in this paper. The stiffness and axial forces in the girders are analyzed by the finite element method and compared with those of the conventional bridges. The FEA results show that the new cooperative system bridge has the truss structure’s characteristics, which shows apparent advantages of stiffness and much smaller axial force in the main girder.
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Li, Yan Wei, Zhi Wei Sun, and Wei Wei Song. "Prestressed Concrete Bridge Bearing Capacity Evaluation Based on Analytic Hierarchy Process and Fuzzy Evaluation Method." Advanced Materials Research 368-373 (October 2011): 2006–10. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.2006.
Full textAbstract:
A bearing capacity evaluation model of prestressed concrete bridge is established based on analytic hierarchy process. In order to determine the bearing capacity of the existing bridge condition, fuzzy evaluation method is used to evaluate material damage degree of bridge structures, in which of experience of experts can be used sufficiently. The method is evident and useful, which can reflect the prestressed concrete bridge in service effectively, improve the existing structure model and optimize the bearing capacity of synthetic evaluation. At the same time, the result is verified reasonably by an engineering example.
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Chen, Feng, Da Lin Hu, and Yi Li Sun. "Anti-Shear Reliability Analysis of Existing Pre-Tensioned Prestressed Concrete Beam Bridges under Atmosphere Condition." Advanced Materials Research 255-260 (May 2011): 1017–22. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.1017.
Full textAbstract:
The shear bearing capacity of pretensioning prestressed concrete beam bridge mainly depends on the stirrup and concrete of the beam, but the longitudinal pre-pressure plays a certain role for the shear bearing of the structure. Under the carbonization corrosion condition, the shear-bearing capacity of the pretensioning prestressed concrete beam will attenuate gradually with the stirrup corrosion and concrete deteriorate. And the risk of brittle shear failure will be increased with the enhanced reinforcement corrosion amount. The paper presents an anti-shear calculation model of the pretensioning prestressed concrete beam bridge, and discusses the time-variation model of the corrosion stirrup considering the effective prestress attenuation under the carbonization corrosion condition. The analysis method on the anti-shear reliability of existing pretensioning bridges under the corrosion condition is proposed then. The method will be used in the durability and safety evaluation of the shear-bearing capacity of the existing pretensioning prestressed concrete bridges.
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Guo, Xuan, Zheyu Zhang, and ZhiQiang Chen. "Mainshock-Integrated Aftershock Vulnerability Assessment of Bridge Structures." Applied Sciences 10, no. 19 (September 29, 2020): 6843. http://dx.doi.org/10.3390/app10196843.
Full textAbstract:
Seismic fragility analysis is often conducted to quantify the vulnerability of civil structures under earthquake excitation. In recent years, besides mainshocks, strong aftershocks have been often witnessed to induce structural damage to engineered structures, including bridges. How to accurately and straightforwardly quantify the vulnerability of bridges due to sequential mainshocks and aftershocks is essential for an efficient assessment of bridge performance. While recognizing the limitation of existing methods, this paper proposes a mainshock integrated aftershock fragility function model, which empirically encodes the effects of mainshocks and retains the simple form of traditional fragility curves. A pile foundation-supported bridge system is modeled considering seismic soil-structure interaction to demonstrate the proposed fragility model. Numerical examples show that the resulting fragility curves incorporate the initial value for the probability of collapse of the bridge system due to a mainshock and the effects of the variable aftershocks conditional on the mainshock. Statistical analysis confirms that the proposed model fits the simulated vulnerability data (e.g., seismic intensities of aftershocks and the response demands conditional a select mainshock ground motion) both accurately and robustly.
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Rokneddin, Keivan, Jayadipta Ghosh, Leonardo Dueñas-Osorio, and Jamie E. Padgett. "Seismic Reliability Assessment of Aging Highway Bridge Networks with Field Instrumentation Data and Correlated Failures, II: Application." Earthquake Spectra 30, no. 2 (May 2014): 819–43. http://dx.doi.org/10.1193/040612eqs160m.
Full textAbstract:
The bridge reliability in networks (BRAN) methodology introduced in the companion paper is applied to evaluate the reliability of part of the highway bridge network in South Carolina under a selected seismic scenario. The case study demonstrates Bayesian updating of deterioration parameters across bridges after spatial interpolation of data acquired from limited instrumented bridges. The updated deterioration parameters inform aging bridge seismic fragility curves through multi-dimensional integration of parameterized fragility models, which are utilized to derive bridge failure probabilities. The paper establishes the correlation structure among bridge failures from three information sources to generate realizations of bridge failures for network-level reliability assessments by Monte Carlo analysis. Positive correlations improve the reliability of the case study network, as predicted from network topology. The benefits of the BRAN methodology are highlighted in its applicability to large networks, while addressing some of the existing gaps in bridge network reliability and prioritization studies.
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Vajdian, Mehdi, Alireza Habibi, and Aliparvari Aliparvari. "Studying the Seismic Reliability in the Cable-Stayed Bridge." Modern Applied Science 10, no. 12 (September 3, 2016): 188. http://dx.doi.org/10.5539/mas.v10n12p188.
Full textAbstract:
With regard to the abundant importance of bridges and the need to study the behavior of these structures against earthquake forces and also new and strong methods for analysis of structures in this article, the probabilistic structure based on seismic reliability is used in order to assess the seismic performance of the members of a cable bridge by using of incremental non-linear dynamic analysis. This analysis method is an efficient tool for estimating the need and capacity in engineering probabilistic method according to the performance. With regard to the unpredictable and uncertain property of earthquake and the hypotheses existing in modeling the bridges and uncertainties existing in demand and capacity and with regard to the losses and severity parameters, the method based on reliability is used for studying in these structures according to the intended performance levels. In this research, the purpose is to study the seismic reliability of one of the cable bridges which has been designed according to the seismic criterion of Iran country (Ahvaz). In this research, sap2000 software has been used for incremental non-linear dynamic analysis, and the reliability level is calculated with regard to FEMA351 instruction.
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Chen, Shuangrui, and Quansheng Yan. "Reliability Estimation of Existing Concrete Bridge Based on Bayesian Dynamic Model." Open Civil Engineering Journal 9, no. 1 (September 10, 2015): 698–704. http://dx.doi.org/10.2174/1874149501509010698.
Full textAbstract:
It is of great significance to timely and accurately forecast the safety state of the bridge as far as the maintenance is concerned. Bayesian forecasting is a method of deriving posterior distribution in accord with the sampling information and prior information, where real time online forecasting is realized by means of recursive algorithm and the stationary assumption. Bayesian dynamic linear model is created to forecast the reliability of the bridge on the basis of the observed stress information of a bridge structure. According to the observed information, the model created is a superposition of constant mean model and seasonal effect model. The analysis of a practical example illustrates that Bayesian dynamic linear modes can provide an accurate real time forecast of the reliability of the bridge
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Kim, Jung Han, Ick-Hyun Kim, and Jin Ho Lee. "Experimental Study on the Behavior of Existing Reinforced Concrete Multi-Column Piers under Earthquake Loading." Applied Sciences 11, no. 6 (March 16, 2021): 2652. http://dx.doi.org/10.3390/app11062652.
Full textAbstract:
When a seismic force acts on bridges, the pier can be damaged by the horizontal inertia force of the superstructure. To prevent this failure, criteria for seismic reinforcement details have been developed in many design codes. However, in moderate seismicity regions, many existing bridges were constructed without considering seismic detail because the detailed seismic design code was only applied recently. These existing structures should be retrofitted by evaluating their seismic performance. Even if the seismic design criteria are not applied, it cannot be concluded that the structure does not have adequate seismic performance. In particular, the performance of a lap-spliced reinforcement bar at a construction joint applied by past practices cannot be easily evaluated analytically. Therefore, experimental tests on the bridge piers considering a non-seismic detail of existing structures need to be performed to evaluate the seismic performance. For this reason, six small scale specimens according to existing bridge piers were constructed and seismic performances were evaluated experimentally. The three types of reinforcement detail were adjusted, including a lap-splice for construction joints. Quasi-static loading tests were performed for three types of scale model with two-column piers in both the longitudinal and transverse directions. From the test results, the effect on the failure mechanism of the lap-splice and transverse reinforcement ratio were investigated. The difference in failure characteristics according to the loading direction was investigated by the location of plastic hinges. Finally, the seismic capacity related to the displacement ductility factor and the absorbed energy by hysteresis behavior for each test were obtained and discussed.
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Kim, Sang-Hyun, Jong-Sup Park, Woo-Tai Jung, and Jae-Yoon Kang. "Strengthening Effect of the External Prestressing Method That Simulated a Deterioration Bridge." Applied Sciences 11, no. 6 (March 12, 2021): 2553. http://dx.doi.org/10.3390/app11062553.
Full textAbstract:
Various methods for strengthening existing structures have been developed owing to the increase in human and property damages caused by the deterioration of structures. Among the various reinforcing methods, the external prestressing method increases the usability and safety of a structure by directly applying tension to the weak tensile area that suffers the greatest deflection during the structure usage. The external prestressing method is advantageous in reducing cracks caused by the introduced tension and restoration of the deflection. Since the strengthening method is applied to deterioration bridges, the strengthening effect is affected by the condition of the existing structure. However, studies on the strengthening effect according to the degree of deterioration are insufficient. Therefore, the behavior according to the strengthening status was analyzed, and the strengthening effect was identified in this study by simulating the deteriorated bridge, reducing the compressive strength and reinforcement quantity, and conducting a four-point loading test. As a result of the experiment, a reinforcement effect of 215% crack load, 161% yield load, and the difference in behavior according to the reinforcement parameters were confirmed.
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Marasabessy, Erwin. "IMPLEMENTATION OF BRIDGE MANAGEMENT SYSTEM ON INTERURBAN BRIDGE IN MALUKU PROVINCE." Journal of the Civil Engineering Forum 1, no. 2 (July 16, 2017): 63. http://dx.doi.org/10.22146/jcef.23999.
Full textAbstract:
Bridges as transport infrastructures play a vital role in smoothing traffic flows. The success of a bridge in playing its role and serving its function depends on its management. The Directorate General of Highways of the Ministry of Public Work has used a system to manage bridges known as the Bridge Management System (BMS). The system allows a systematic plan and provides a uniform procedure for all bridge operation activities on the national and provincial level. Data from Implementation Agency of National Inter-Urban Roads of Area IX, Northern Maluku in 2011 indicates that the total length of national roads in Maluku Province is 15,238.01 M, with a total of 562 bridges. In Ambon Island, especially, there are 52 bridges totaling 1,176.25 m in length. The study was conducted at several inter-urban bridges in Maluku Province of Ambon Island: Wai Batu Merah, Wai Ruhu, Wai Lawa, Wai Yari and Wai Tua bridges. Assessment of bridge structure conditions was conducted visually to determine the conditions of the existing bridges comprehensively by referring to the Bridge Management System (BMS) complemented with a computer-based Bridge Management Information System (BMIS). Condition scores for the five bridges—Wai Batu Merah, Wai Ruhu, Wai Lawa, Wai Yari, and Wai Tua, according to Bridge Management System, are 2, 1, 2, 1, and 2 respectively. The scores of the five bridges indicate that their physical condition can be categorized as good or with minor defects. Based on technical screening, the proposed treatment for Wai Batu Merah, Wai Ruhu, Wai Lawa, dan Wai Tua bridges is the rehabilitation of their sub-elements. As for the Wai Yari Bridge, the treatment will be maintained regularly. The defect repair costs are IDR 149,138,238.00, IDR 81,048,000.00, IDR 174,579,106.10, IDR 79,233,324.01 and IDR 238,323,258.60 for Wai Batu, Wai Ruhu, Wai Lawa, Wai Yari, and Wai Tua Bridges, respectively.
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Cheng, Yong Chun, Hong Bin Guo, Xian Qiang Wang, and Yu Bo Jiao. "Durability Assessment of Reinforced Concrete Bridge Based on Fuzzy Neural Networks." Advanced Materials Research 838-841 (November 2013): 1069–72. http://dx.doi.org/10.4028/www.scientific.net/amr.838-841.1069.
Full textAbstract:
In the operation process of bridge structures, some bridges appear early failure without reaching design reference period due to the influences of external environment, vehicle load and other factors. Therefore, the problem of structure durability is very obvious. In this paper, a new durability assessment method is proposed based on fuzzy neural networks, which can take account of the defects and deficiencies of existing durability assessment methods. The simulation for learning and testing samples indicates that the proposed method possesses good learning ability and predictive analysis ability. Actual project verifies the effectiveness of the method
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Yin, Haijun, Ziqing Li, and Xianwu Hao. "Research on structural dynamic characteristics of continuous steel box girder-bridge with lager ratio of wide-span." ITM Web of Conferences 17 (2018): 03008. http://dx.doi.org/10.1051/itmconf/20181703008.
Full textAbstract:
Structure natural frequency and mode of vibration can not only reflect the structure modal parameters of dynamic properties, but also incarnate the dynamic evaluation characteristics of bridge structure. This paper applies ANSYS to establish the finite element model based on a continuous steel box girder bridge in order to obtain the corresponding modal analysis parameters. Through the environmental stimulation test, The results show that height of the steel box girder and the setting of diaphragm plate is reasonable, transverse space of piers not merely provide enough support but also ensure lateral stability of the bridge, as well as offering aside the maximum lateral clearance of the existing road. Meanwhile, the calculation results have important engineering practical values. which can provide basic data for the design, construction and maintenance of similar Bridges.
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Bodnar, Larysa, Serhii Stepanov, Serhii Zavhorodniy, and Vitalii Yastrubinetskyi. "Repair programs development taking into account the presence of high-risk defects on bridges." Dorogi i mosti 2021, no. 23 (March 25, 2021): 158–66. http://dx.doi.org/10.36100/dorogimosti2021.23.158.
Full textAbstract:
Introduction. In recent years in Ukraine, the weight and traffic volume of vehicles on the roads have increased significantly. Most of the bridges that are operating on these roads were built according to norms, the design loadings of which are not corresponding to the modern loadings on transport facilities.Problem Statement. The issue of bridges operation with defects of the structure in the condition of limited funding of the road industry become particularly relevant at the present stage, as the age of bridges is constantly increasing, and the resource of their elements is being expiring.Due to limited funding, the economic and time components of the designed models have a significant impact on the quality of performed calculations and the determination of the optimal strategy for performing of repairing work in specified conditions. The choice of planned works is determined during repairing plans development, both for evaluation of the current state of bridges and for determination of predicted bridge repairing terms.Purpose. the purpose of the work is the development of further optimization of the mode of repairs plan development to eliminate existing defects of bridges.Materials and methods. During the determination of repairs cost in the Analytical Expert Bridge Management System (AESUM), the average norms of the work volume were used. This method was limited by the fact that cost calculations were constant and did not consider actual defects of the bridges. The experience of the constructed bridges operation over 40–50 years revealed a significant number of various defects of structure, mainly of spans and piers. The causes of defects are long-term operation without proper maintenance, as well as a number of shortcomings during the design and construction of bridges. In order to further mode optimization of repair plans development, the existing defects on the bridges were studied from the point of view of their impact on the further destruction of certain elements of the bridge, or the facility as a whole, on the acceleration of this process. Such defects have been identified as high risk defects.Results. Scientists of «DerzhdorNDI» SE have developed and applied the technique of repair cost determination by formation of works complex to eliminate existing defects at the inspected facilities. A module for bridge repair planning has been developed considering the need for priority elimination of high risk defects.Conclusions. The technique of repairs cost determination was developed, as well as the module for bridge repair planning considering the need for priority elimination of high risk defects.Keywords: highway bridge, Analytical Expert Bridge Management System (AESUM), repairs cost determination, defect on bridges.
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Li, Fang Yuan, Zheng Yuan Xie, and Xiao Shuai Guo. "Literature Reviews and Summary of Concrete Bridge Seamless Broaden Technology." Applied Mechanics and Materials 193-194 (August 2012): 1290–95. http://dx.doi.org/10.4028/www.scientific.net/amm.193-194.1290.
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When the bridges broaden with seamless technology, there are differences between the existing bridge and the new bridge in design, construction and service. Because of concrete creep and shrinkage, temperature effect and prestress loss, there are stress defects in the seam, which will affect the service and safety. The current methods for the seam in foreign and domestic, such as plant steel and semi-rigid connection method are passive measures based on structure exiting state, which cannot ensure the long-term performance of the seam.
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Sun, Hao, Yong Jiu Qian, and Fang Zhang. "Assessment & Analysis of Service Performance for Small-Span Suspension Bridge with Steel Truss Girders." Applied Mechanics and Materials 178-181 (May 2012): 2187–91. http://dx.doi.org/10.4028/www.scientific.net/amm.178-181.2187.
Full textAbstract:
Most of the short span suspension bridges with steel truss girders early constructed will approach their design service life. Correctly evaluating the actual service performance is the basic basis of repairing, strengthening and technical reconstruction. First, load-bearing capacity evaluation based on static load test was briefly introduced. Then, combined with Chengnan bridge, the main existing damages and their causations of the bridge were summarized and analyzed. Based on the field detection datum and original design load grade, the finite element mode with some damages was established. Then, by analyzing the calculation results, the scheme of static load test was confirmed. Through comparing the static load test results with the results of upgraded finite element, the actual conditions of the existing bridge structure were evaluated. In order to resume its load-bearing capacity, some of measurements and suggestions of strengthening were proposed.
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Pawlak-Jakubowska, Anita. "PARAMETRIC MODELLING OF CLASS II MECHANISMS APPLIED IN MOVABLE STRUCTURES." Boletim da Aproged, no. 34 (December 2018): 21–24. http://dx.doi.org/10.24840/2184-4933_2018-0034_0002.
Full textAbstract:
Movable engineering structures are an important topic of modern scientific issues connected with civil engineering. Working on solutions to these issues requires an interdisciplinary action in fields such as geometry, construction, machine theory and mechanics or automatics. The author work considers class II mechanisms in existing solutions that occur in moving engineering, such as retractable roofs and bridges. Movement realization has a major influence on the behaviour of the structure during displacement. The analysis of the movability of existing engineering objects supported by parametric modelling facilitates the study of movement and allows for new concepts of solutions. KEYWORDS: retractable roof, movable bridge, class II mechanisms, quadrangles.
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Diao, Yan. "T-Shaped Girder Bridge Detection." Applied Mechanics and Materials 501-504 (January 2014): 1305–9. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.1305.
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this article through the detection of T-shaped girder bridge, grasp the present situation of bridge structure and disease, and evaluate existing technical conditions to provide technical basis for the repair and reinforcement of the bridge in the future.
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Breccolotti, M., G. Franceschini, and A. L. Materazzi. "Sensitivity of Dynamic Methods for Damage Detection in Structural Concrete Bridges." Shock and Vibration 11, no. 3-4 (2004): 383–94. http://dx.doi.org/10.1155/2004/752013.
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A critical analysis of the available methods for the assessment of structural concrete bridges through the observation of their dynamic response is carried out. A mathematical model for the evaluation of the natural frequencies shift due to bridge damage is applied to the case of an existing reinforced concrete bridge. The numerical results, along with the general structure of the mathematical problem, allow discussing some limitation and drawbacks of the dynamic methods. Namely the need for a reference set of the bridges dynamic properties before the onset of damage and the effect of the ambient temperature variation may lead, in many cases, to unreliable estimates of the structural condition of the investigated bridges.
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Chen, Xu Yong, and Xiao Xie. "Research on Masonry Arch-Bridges Reinforcement and Reconstruction Methods." Applied Mechanics and Materials 501-504 (January 2014): 1152–56. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.1152.
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We analyze existing masonry arch-bridges and corresponding reinforcement methods in this paper and bring about the method of using strip-shaped outer-wrap reinforced concrete with chemically planted bar to improve the new and old concretes cooperative work so as to strengthen the wholeness and improve impermeability of the bridge. We also compare two experiments on one actual bridge of 30 cm strip-shaped outer-wrap reinforced concrete in the main arch ring and 20 cm global outer-wrap reinforcement concrete, of which the data shows the superiority of strip-shaped outer-wrap reinforced concrete for it strengthens both the bridge floor and bottom structure and improve the load capacity.