To see the other types of publications on this topic, follow the link: Steel Truss Bridge.
Dissertations / Theses on the topic 'Steel Truss Bridge'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 42 dissertations / theses for your research on the topic 'Steel Truss Bridge.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Cao, Youyou. "System Redundancy Evaluation for Steel Truss Bridge." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/77389.
Full textAbstract:
In current bridge practice, all tension members in a truss bridge are identified as fracture critical members which implies that a collapse is expected to occur once a member of this type fails. However, there are several examples which show that bridges have remained standing and shown little distress even after a fracture critical member was completely damaged. Due to the high inspection cost for fracture critical members, it would be beneficial to remove fracture critical designation from some tension members. This could be achieved via considering system redundancy. Since there is no clear guidance in existing codified provisions for assessing system redundancy, this research is undertaken to develop simplified analysis techniques to evaluate system redundancy in truss bridges.
The proposed system redundancy analysis in this research starts with the identification of the most critical main truss members whose failure may significantly affect the system redundancy. The system redundancy is then measured by the remaining load capacity of a damaged bridge after losing one of the critical members. The bridge load capacity is checked using 3D models with nonlinear features that can capture the progression of yielding and buckling in a bridge system. The modeling techniques are validated through the case studies of the I-35W Bridge and one test span of the Milton-Madison Bridge. Reasonable correlations are demonstrated between the models and the measured data for these two bridges both in an undamaged and in a damaged state.
The feasibility of the proposed methodology for system redundancy evaluation is examined by applying the methodology blindly to two other simple truss bridges. The application shows that the proposed methodology can efficiently measure the system redundancy. To improve the system redundancy, this research also proposes sample retrofit strategies for the four example bridges.Ph. D.
2
Dickens, Loren E. III. "Structural check of a steel through truss bridge." Manhattan, Kan. : Kansas State University, 2008. http://hdl.handle.net/2097/758.
Full text
3
Minawi, Ailanto Daniel. "Design of a Long-Span Arch Truss Steel Bridge." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/4289/.
Full text
4
Akin, Tugba. "Structural Monitoring And Analysis Of Steel Truss Railroad Bridges." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614825/index.pdf.
Full textAbstract:
Railroad bridges are the most important connection parts of railroad networks. These bridges are exposed to heavier train loads compared to highway bridges as well as various detrimental ambient conditions during their life span. The railroad bridges in Turkey are mostly constructed during the late Ottoman and first periods of the Turkish Republictherefore, they are generally close to about 100 years of age
their inspection and maintenance works are essential. Structural health monitoring (SHM) techniques are widely used around the world in order to increase the effectiveness of the inspection and maintenance works and also evaluate structural reliability. Application of SHM methods on railway bridges by static and dynamic measurements over short and long durations give important structural information about bridge members&rsquo
load level and overall bridge structure in terms of vibration frequencies, deflections, etc. Structural Reliability analysis provides further information about the safety of a structural system and becomes even more efficient when combined with the SHM studies. In this study, computer modeling and SHM techniques are used for identifying structural condition of a steel truss railroad bridge in Usak, Turkey, which is composed of six spans with 30 m length each. The first two spans of the bridge were rebuilt about 50 years ago, which had construction plans and are selected as pilot case for SHM and evaluation studies in this thesis. Natural frequencies are obtained by using 4 accelerometers and a dynamic data acquisition system (DAS). Furthermore, mid span vertical deflection member strains and bridge accelerations are obtained using a DAS permanently left on site and then compared with the computer model analyses results. SHM system is programmed for triggering by the rail load sensors developed at METU and an LVDT to collect mid span deflection high speed data from all sensors during train passage. The DAS is also programmed to collect slow speed data (once at every 15 minutes) for determination of average ambient conditions such as temperature and humidity and all bridge sensors during long term monitoring. Structural capacity and reliability indices for stress levels of bridge members are determined for the measured and simulated train loads to determine structural condition of bridge members and connections. Earthquake analyses and design checks for bridge members are also conducted within the scope of this study.
5
Santos, Cody Joshua. "Dynamic Testing for a Steel Truss Bridge for the Long Term Bridge Performance Program." DigitalCommons@USU, 2011. https://digitalcommons.usu.edu/etd/894.
Full textAbstract:
Under the direction of the Federal Highway Administration the Long Term Bridge Performance Program (LTBP) selected Minnesota Bridge number 5718 as a pilot bridge for evaluation. This program focuses on the monitoring of bridges for a 20-year period to understand the structural behavior over time due to the various loads and weathering. In monitoring this bridge a better understanding can be acquired for the maintenance issues related to the nation's deteriorating bridge infrastructure.
Bridge Number 5718, which is located just outside of Sandstone Minnesota, is a steel truss bridge that spans the Kettle River. Constant monitoring of the bridge along with periodic testing of the bridge will allow for the collection of data over a 20-year period. The focus of this work is to establish a baseline for the bridges characteristics through nondestructive dynamic testing. Later tests will be compared to these results and changes can then be tracked.
In order to perform the required testing, two electromagnetic shakers were used to produce the excitation. The bridge was also outfitted with an array of velocity transducers to allow for the response to be recorded. The data was then used to extract the resonant frequencies, mode shapes, and damping ratios. A modal assurance criterion was also performed to solidify the findings. These parameters define the structural identity of the bridge. Through performing these tests the database that is being collected under the Long Term Bridge Performance Program will be used to better the overall health and safety of the nation's bridges.
6
Mentes, Yavuz. "Analytical and experimental assessment of steel truss bridge gusset plate connections." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42767.
Full textAbstract:
The I-35W Bridge over the Mississippi River in Minneapolis, MN had a catastrophic failure in the main span of the deck truss in 2007. This collapse has brought significant attention on the gusset plate connections in steel truss bridges throughout the U.S. Steel truss bridge gusset plate design has not received much focus in the past 40 years, and there is a lack of consensus within the design profession on the procedures to evaluate, design, and rate these critical elements. In the short term, based on the best available information on the gusset plate design, the Federal Highway Administration (FHWA) has issued preliminary guidance. Although some experimental research has been conducted on the ultimate strength of gusset plates, much of this work has been directed toward the performance of tension members and their connections. There has been limited experimental work on the compression capacity and stability of gusset plates, but most of this work is relevant primarily to bracing connections common in building structures. This research focuses on comprehensive experimental and analytical studies on steel truss bridge gusset plate behavior. The studies include comparisons of advanced analytical models with the responses from large-scale experimental tests using discrete and innovative full-field measurements. The calibrated finite element analysis models are then utilized to study a variety of gusset plate configurations. Improved mechanistic idealizations that better capture the observed behavior in the experiments and analytical studies are proposed as the result of this work. The design checks recommended in this thesis present a comprehensive methodology for determining the ultimate gusset plate resistance. This research provides a large database of original results that will be useful for future similar studies. In addition, this research provides modeling procedures that permit the study of steel truss bridge connections and their adjacent framing members using truss bridge sub-assemblies. Based on the comprehensive analytical studies, simple and accurate design calculation procedures to assess the nominal ultimate strength of steel truss gusset plate connections are recommended for steel truss bridge gusset plate connections.
7
Laurendeau, Matthew P. "Live-Load Testing and Finite-Element Analysis of a Steel Cantilever Deck Arched Pratt Truss Bridge for the Long-Term Bridge Performance Program." DigitalCommons@USU, 2011. https://digitalcommons.usu.edu/etd/904.
Full textAbstract:
The Long Term Bridge Performance (LTBP) program is an organization within the Federal Highway Administration that inspects, tests, analyzes, and observes, for an extended period of time, a variety of bridge types throughout the United States. Part of the program includes periodic testing of select bridges of a span of 20 years. The Kettle River Bridge located outside of Sandstone, Minnesota was selected for study due to its unique design.
The Kettle River Bridge is a historical steel cantilevered deck arched Pratt truss bridge. The bridge was instrumented with 151 strain gauges on various floor and truss members along with eight displacement gauges strategically placed along the truss. All gauges were read simultaneously as the bridge underwent non-destructive live loading. The recorded gauge readings were analyzed to determine bridge behavior and then used in the assistance of calibrating a working finite-element model.
After a working model was verified the distribution factors for the interior and exterior floor stringers were determined. By using the controlling distribution factor, a load rating for the bridge was determined for both inventory and operating. The distribution factors and load ratings determined using the working finite-element model were then compared to the AAHSTO LRFD specifications.
8
Hickey, Lucas James. "Model Validation for a Steel Deck Truss Bridge over the New River." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/32154.
Full textAbstract:
This thesis presents the methods utilized to model a steel deck truss bridge over the New River in Hillsville, Virginia. These methods were evaluated by comparing analytical results with data recorded from 14 members during live load testing. The research presented herein is part of a larger endeavor to understand the structural behavior and collapse mechanism of the erstwhile I-35W bridge in Minneapolis, MN. Objectives accomplished toward this end include investigation of lacing effects on built up member strain detection, live load testing of a steel truss bridge, and evaluating modeling techniques in comparison to recorded data.
Before any live load testing could be performed, it was necessary to confirm an acceptable strain gage layout for measuring member strains. The effect of riveted lacing in built-up members was investigated by constructing a two-thirds mockup of a typical bridge member. The mockup was then instrumented with strain gages and subjected to known strains in order to determine the most effective strain gage arrangement. Testing analysis concluded that for a built up member consisting of laced channels, one strain gage installed on the middle of the extreme fiber of each channelâ s flanges was sufficient. Thus, laced members on the bridge were mounted with four strain gages each.
Data from live loads were obtained by loading two trucks to 25 tons each. Trucks were positioned at eight locations on the bridge in four different relative truck positions. Data were recorded continuously and reduced to member forces for model validation comparisons. Deflections at selected truss nodes were also recorded for model validation purposes.
The model validation process began by developing four simple truss models, each reflecting different expected restraint conditions, in the hopes of bracketing data from recorded results. Models were refined to frames, and then frames including floor beams and stringers for greater accuracy. The final, most accurate model was selected and used for a failure analysis. This model showed where the minimum amount of load could be applied in order to learn about the bridgeâ s failure behavior, for a test to be conducted at a later time.
Master of Science
9
Brunell, Garrett Floyd. "Functionality of a Damaged Steel Truss Bridge Strengthened with Post-Tensioned CFRP Tendons." Thesis, North Dakota State University, 2012. https://hdl.handle.net/10365/26559.
Full textAbstract:
This research program investigates the performance of a steel truss bridge when subjected to both localized web damage and a subsequent post-tensioned strengthening approach. The investigation utilizes a combined approach involving an experimental scale model bridge and a numerical computer model generated using the commercial finite element software RISA 3-D. The numerical model is validated using test data and further extended to parametric studies in order to investigate the theoretical load rating, strain energy, load redistribution, mode shapes and frequency of the bridge for control, damaged and strengthened states. The presence and severity of damage are found to significantly influence the global safety and reliability of the bridge. Also, higher order modes are more susceptible to changes in shape and frequency in the presence of damage. A recovery of truss deflection and a reduction of member forces are achieved by the proposed strengthening method.
10
Orlando, Lorenzo. "Finite Element model calibration of a historical railway steel truss bridge by using dynamic monitoring data." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.
Find full textAbstract:
This paper proposes a multidisciplinary approach, combining the terrestrial laser scanner and ambient vibration tests to characterize a historical steel truss bridge in Spain: the
Vilagarcia Celosia Bridge. All methods are complemented by advanced numerical simulations and a coarse to fine calibration strategy, based on the Cotter and the non-linear least squares approaches. Results obtained corroborate the robustness of the proposed approach, with a max error in frequencies of 3.6% and an average modal assurance criterion of 0.93.
11
Häggström, Jens. "Evaluation of the Load Carrying Capacity of a Steel Truss Railway Bridge : Testing, Theory and Evaluation." Licentiate thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-60029.
Full textAbstract:
A good deal of resources has been invested in building and maintaining existing infrastructure.Many structures are now becoming old and do not meet the requirements of an increasingtraffic load, or are reaching the end of their lifecycle. It is not possible or sustainable to replaceall those structures that have been judged to be obsolete or nearly obsolete. However, in manycases, their specified load carrying capacities are understated, so there is an urgent need toobtain more robust knowledge of their true status. In the design of new structures, a numberof assumptions relating to loading and structural behaviour have to be made, a number that canbe reduced by finding out more about the actual behaviour of the structure. This licentiate thesis describes the structural behaviour of existing unballasted open steel trussrailway bridges in general and methods for assessment in particular, with the aim of keepingthese structures in service for longer. An extensive program, divided into three phases of experimental studies, was carried out toincrease the understanding of existing unballasted steel truss railway bridges. Phase I consisted of instrumentation and monitoring of a 60 year-old railway bridge (ÅbyBridge) while it was still in service. A description of the object and the monitoring in thisphase of measurements is presented in Chapter 3 with some results and analysis in Chapter 4.Some of the findings from Phase I are described in Paper A, from which it was concluded thatthe stringer beams were subjected to large stresses originating from torsion and out-of-planebending. These effects are not normally considered yet may have significant consequences inrelation to fatigue. In Phase II, the former bridge over the Åby River was replaced and put beside the railwaytracks, where the instrumentation from Phase I was extended. The bridge was statically testedin 18 pre-defined load series before reaching failure. Phase II is described in Chapter 3 andsummarized in Paper B. It was found that the bridge could withstand loading corresponding tofour times the highest permitted axle-loading, or twice the design load for new bridges, beforeexhibiting an obvious non-linear behaviour with regard to vertical displacement in the midspan.The peak load was achieved at loading approximately 50% higher than the initial nonlinearbehaviour, where lateral buckling of the top chord limited the structure from carryingmore load. The failure can be concluded as being redundant without brittle failure of any ofthe connections. In Phase III, a different bridge was fitted with instrumentation and monitored while subjectedto live loading: the bridge over the river Rautasjokk. The Rautasjokk Bridge was constructedfive years later than the Åby Bridge, using the same drawings thus making it theoreticallyidentical in terms of geometry and material. It is situated along the “Ore line”, meaning that itis subjected to higher loads compared to the Åby Bridge which was located along the “Mainline”. The program for measurements originated from a code-based assessment which ruled thebridge unsafe to use with regard to fatigue of the stringers due to the gusset plates welded tothe top flange of the stringers. Paper C describes the measurement of local fatigue strains (hotspot)and comparison with nominal strains. In that paper, it was concluded that the hot-spotapproach was only favourable for one out of three studied positions, with regard to fatiguelifespan. This thesis ends with conclusions and suggestions for further research.
12
Hasil, Tadeáš. "Drážní most nad vodotečí." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-392120.
Full textAbstract:
The subject of this master's thesis is a static and structural design of a Load-carrying steel structure of railway bridge with bottom steel deck of the span of 42 + 60 + 42 m over the Labe river in Děčín. A solid steel beam forms the main load-bearing structure of the bridge reinforced with truss-work. The truss-work is made up of an open top chord and diagonal strut without secondary vertical struts. The calculations were done in compliance with valid ČSN EN documents.
13
Wang, Liang. "Innovative damage assessment of steel truss bridges using modal strain energy correlation." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/53177/1/Liang_Wang_Thesis.pdf.
Full textAbstract:
As a part of vital infrastructure and transportation network, bridge structures must function safely at all times. Bridges are designed to have a long life span. At any point in time, however, some bridges are aged. The ageing of bridge structures, given the rapidly growing demand of heavy and fast inter-city passages and continuous increase of freight transportation, would require diligence on bridge owners to ensure that the infrastructure is healthy at reasonable cost. In recent decades, a new technique, structural health monitoring (SHM), has emerged to meet this challenge. In this new engineering discipline, structural modal identification and damage detection have formed a vital component. Witnessed by an increasing number of publications is that the change in vibration characteristics is widely and deeply investigated to assess structural damage. Although a number of publications have addressed the feasibility of various methods through experimental verifications, few of them have focused on steel truss bridges. Finding a feasible vibration-based damage indicator for steel truss bridges and solving the difficulties in practical modal identification to support damage detection motivated this research project.
This research was to derive an innovative method to assess structural damage in steel truss bridges. First, it proposed a new damage indicator that relies on optimising the correlation between theoretical and measured modal strain energy. The optimisation is powered by a newly proposed multilayer genetic algorithm. In addition, a selection criterion for damage-sensitive modes has been studied to achieve more efficient and accurate damage detection results. Second, in order to support the proposed damage indicator, the research studied the applications of two state-of-the-art modal identification techniques by considering some practical difficulties: the limited instrumentation, the influence of environmental noise, the difficulties in finite element model updating, and the data selection problem in the output-only modal identification methods.
The numerical (by a planer truss model) and experimental (by a laboratory through truss bridge) verifications have proved the effectiveness and feasibility of the proposed damage detection scheme. The modal strain energy-based indicator was found to be sensitive to the damage in steel truss bridges with incomplete measurement. It has shown the damage indicator's potential in practical applications of steel truss bridges. Lastly, the achievement and limitation of this study, and lessons learnt from the modal analysis have been summarised.
14
Mazza, Silvia. "Dynamic behaviour of the railway steel bridge crossing Po river at Ostiglia: global and local analysis." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016.
Find full textAbstract:
Structural health monitoring is a very important phase of the maintenance of a civil work. In fact, thanks to the installation of a system able to monitor the conditions of a structure, it is possible to verify how this same structure responds to the loads to which it is subjected and to identify potentially damaged zones. Specifically, a railway bridge crossing a river undergoes stresses and deformations caused by the passage of trains, earthquake events and interactions with water. The INFRASAFE project aims to investigate all these aspects in order to guarantee a total monitoring of a specific structure - the bridge at Revere crossing Po river – in the environmental surrounding where it is placed. This research thesis is part of such project in a sense that it constitutes the preliminary analytical phase prior the experimental campaigns in the site. The truss structure will be modeled in Straus7 and a modal analysis will be performed in order to determine its frequencies and vibration modes. In addition, the axle loads of the real trains passing on the bridge will be considered for a linear static analysis. The results of such analysis will be investigated and the most stressed steel junction will be locally modeled in order to study its fatigue capacity.
15
Cowled, Craig J. "On the influence of structural complexity on the global vibration characteristics of steel truss bridges." Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/115793/1/Craig_Cowled_Thesis.pdf.
Full textAbstract:
This research focuses on the vibration characteristics of steel truss bridges and how structural complexity influences the chances of successful damage detection (DD). The structural complexity of almost 200 structures from the literature is quantified, highlighting that DD is less successful for experimental structures with high levels of complexity as compared to structures with low levels of complexity. The vibration characteristics of a complex structure were studied under different damage scenarios, revealing that the characteristics most sensitive to damage were also the characteristics with the highest variance. In short, structural complexity makes damage detection difficult.
16
Trachtulcová, Šárka. "Výrobní hala." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-372106.
Full textAbstract:
The subject of this diploma thesis is desigh and assessment of steel structure industrial building. This hall has two bays. The width of the main bay is 30 metres, the width of the second bay is 15 metres. The length of building is 90 metres. Load-bearing system is created of three fixed columns with pin-supported truss beams between. Construction of roof is designed as truss purlin system. There is a bridge crane of 32 tons capacity. The building is situated in area of Uherské Hradiště.
17
Olbert, Jan. "Železniční most přes místní silnici." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240335.
Full textAbstract:
The thesis deals with the variant design of the steel structure of single-track railway bridge on the line Tišnov – Nové Město na Moravě. The task is bridging the local road by a bridge structure with one field. Length of the bridge is 40 m.
18
Šarmanová, Iveta. "Železniční most s ocelovou nosnou konstrukcí." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265627.
Full textAbstract:
The subject of master’s thesis is a structural analysis of a bearing structure of an existing historical single-track railway bridge over the Vltava river in a direction from Prague Modřany to Vrané nad Vltavou. The riveted steel bridge carries rail traffic across five fields. A part of the master’s thesis is focused on a disposal of a variant of the longest field by using a modern arch construction.
19
Hurych, Marek. "Lávka přes nádraží." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-409851.
Full textAbstract:
The diploma thesis deals with design of loadbearing stell structure of a footbridge across the railway station. Footbridge is situated in the city centre of Brno with total length of 135 meters. For comparison, three bridging variants are predesigned and a varints comparison is made. The selected option was developed in greater detail. It is an arched structure with a semithrough bridge deck and adjacent span with support of oblique column. The main loadbearing structure consists of a pair of pin-supported arches inclited to each other at an angle of 11°. Arches support beams with susperder, the beams are conected by ortotropic steel deck. All load-bearing elements are designed from S355 stell. Spatial rigidity of the structure is ensured by tilting of the arches and by truss bracing at the top of the arch in combination with rigid struts of arch. Spatial rigidity of the superted deck is ensured by ortotropic steel deck.
20
Malý, Jan. "Objekt pro průmyslovou výrobu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265431.
Full textAbstract:
The subject of this diploma´s thesis is the design and assessment of steel structure two-bay building for industrial production. The width of the side aisles is 15 meters and the width of the main aisles is 35 meters. The length of industrial building is 90 meters. The height of the building is 17.4 meters. Steel structure of main aisles consists of main truss, the distance is 6 meters. The main truss consists of truss girder and fixed column. In the main aisles traversed, by bridge crane with a capacity of 20 tons. Steel structure of side aisles consists frame construction. The building for industrial production is designed for the area of Blansko.
21
Pham, Hoang Anh. "Lávka pro pěší přes řeku Dyji v Břeclavi." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-392109.
Full textAbstract:
This thesis deals with structural design of a steel frame footbridge with wheelchair access, which will lead pedestrian and cyclists‘ traffic over the river Thaya in Břeclav. The footbridge is a structure of one field, lightness of a bridge opening is 58,92 m and a span length is 60,25 m. A light width of an area between rails is 2,5 m. The footbridge is constructed of a truss beam cable – stayed bridge on an oblique pylon of 20,0 m length and a preloaded steel suspender. The thesis was processed according to valid standards ČSN EN.
22
Ganglbauer, Tereza. "Nosná ocelová konstrukce železničního mostu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-371925.
Full textAbstract:
The master thesis focuses on the design of a Load-carrying steel structure of railway bridge with bottom steel deck of the span of 28 + 45 + 23 m. The bridge is situated in the municipality of Třebestovice. Four variants of solution have been calculated. Two variants are made by plate main beams of variable profile, the next alternative was made by truss structure and the fourth variant consist of a combination of plate main beams with truss stiffener in the middle span. The most optimal solution was processed in detail. The calculations were done in compliance with valid ČSN EN norms.
23
Beran, Miroslav. "Výrobní hala." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-392241.
Full textAbstract:
The diploma thesis deals with the design and assessment of the steel supporting structure of the production hall. The transverse dimension of the hall is 21,00 m, the longitudinal dimension is 70,00 m, the height of the hall is 17,56 m. S355 steel is used as the main supporting material. The supporting part of the hall consists of columns on which is placed a truss and two crane tracks at two height levels. Three different types of purlins and pillars are considered in the design of the steel structure. For the selected variant, a static calculation of the main bearing elements, including selected details, is drawn up and drawings are drawn up.
24
Vošček, Martin. "Silniční a tramvajový most." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265573.
Full textAbstract:
The subject of this Diploma Thesis is to develop different alternatives of the road and tram bridge. It is a river bridge with the length of 52,5 m. There are compared two proposals, while in the first proposal it is an arch bridge with the tension bars. The second proposal which is also finalized as the winning proposal is the truss structure. Both proposals have composite deck. The structure is designed from steel S355 and concrete C35/45. The load bearing structure is designed in accordance with applicable technical standards.
25
Borchers, Stephanie. "Parametric analysis of resilient design of steel truss bridges." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/99587.
Full textAbstract:
Thesis: M. Eng., Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2015.Cataloged from PDF version of thesis.
Includes bibliographical references (page 55).
Designing structures to be resilient to extreme loads has become a topic of interest in recent years, which has been triggered by the progressive collapse of structures in the past. Structural failure due to the lack of resilient design has been particularly prevalent in bridges. The failures have been results of a variety of factors that the bridges have been subjected to. The objective of preventing the occurrence of future collapses has encouraged further research into the design of resilient structures. Two main methods to design for resilience have been implemented in this thesis. These methods include the incorporation of robustness or redundancy into the bridge design. Each method is advantageous over the other in certain circumstances. These methods are both based on linear static analysis procedures. A series of 2D truss bridge models with varying parameters have been analyzed for their performance in damaged states. The damage incurred by the bridges include the removal of a pier and the removal of bridge members. The results of this investigation conclude that the cost of designing a bridge to be resilient is relatively low in comparison to the overall cost of the bridge. Robust bridge designs are generally more effective for bridges with longer spans, whereas designs with redundancy are better suited for shorter spans. As the amount of structural damage that is incurred by a bridge increases, the more redundancy should be built into the structure. These results were shared by all three of the truss topologies that were explored.
by Stephanie Borchers.
M. Eng.
26
Bartoň, Radek. "Ocelová lávka pro pěší." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227509.
Full textAbstract:
This diploma thesis contains a study of current composite structure of footbridge and in part II design and assessment of steel structure of footbridge for pedestrians and cyclists placed on current footbridge location. Current footbridge is located on "nábřeží Dukelských hrdinů" in Rožnov pod Radhoštěm. In part I, assessment of the current composite structure of footbridge is done, using ČSN and ČSN EN standards for adjusted static behavior of the structure. Comparison of both assessments is made and also with an original assessment from 1988. In part II, design and assessment of steel structure of footbridge placed on currents footbridge location described in part I is done.The structure was designed as two vierendeels trusses connected with cross beams, supporting concrete bridge deck. 9 variants were examined, differing with truss height and the number of verticals. Detailed design and assessment for parts of the structure is done for the chosen variant.
27
Urbánek, Jan. "Lávka pro pěší v Blansku." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265355.
Full textAbstract:
The subject of the thesis is design and check of steel load-bearing structure of a footbridge. The footbridge spans the river Svitava in the town Blansko. The span length is 24 metres. The structural design is spatial bar structure with two main trusses. The upper and lower chords are curved in the shape of circular arch and they are connected by diagonal bars. In the level of the upper and lower chords the beams are connected by floor beam. Horizontal rigidity of the upper and lower construction area is secured by bracings. The bridge deck is laid on the lower floor beam. The solution is the result of the comparison and evaluation of two variants.
28
Fiedlerová, Lucie. "Nosná ocelová konstrukce kryté lávky pro pěší mezi budovami výukového areálu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225524.
Full textAbstract:
The subject of this master’s thesis is to design the supporting steel structure covered pedestrian bridge between the learning area buildings A and D of the Faculty of Civil Engineering, street Veveří 95 in Brno. The construction is designed as a bridge rod spatial structure with two main girders. The girders are a combination Vierendeel girder and truss structure. The girders are connected at the level of the upper and lower band by a crosspiece. The horizontal stiffness of the upper and lower surface structure is ensured by bracing. The upper surface of the pedestrian bridge is horizontal in the longitudinal direction. The lower surface of the pedestrian bridge is curved in order to overcome the difference in height between buildings A and D. This solution is the result of comparison an evaluation of three alternative solutions.
29
Mikhno, Yevgeniy. "Návrh lávky přes silnici I/11 v Ostravě." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-409840.
Full textAbstract:
The aim of this bachelor thesis is variant design and assessment of loadbearing structure of steel footbridge over I/11 route. Main superstructure will have two steel arched beams joined with lower orthotropic deck using suspenders in the „V“ shape. For assessment of superstructure a three-dimensional structural computational model was created in software Dlubal RFEM 5.20. The span of the footbridge is 48,71 m, free width is 4 m, height is 7,5 m. The structure was designed according to currently valid standarts to the ultimate limit state and serviceability limit state. Supporting elements are designed from steel of class S355.
30
Chaloupka, Petr. "Lávka mezi budovami." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225486.
Full textAbstract:
This master's thesis deals with the designing of the appropriate supporting steel structure footbridge for pedestrians. The footbridge is used to connect two separate buildings (buildings D and Z at the Faculty of Civil Engineering Brno University of Technology). Four variants have been designed about solutions supporting steel structure. The final variant was prepared in detail and was carried out static assessment of the individual elements and selected details. The main supporting structure of this variant are two trusses. Diagonals of these trusses are designed linkage system of Macalloy 460. Bridge deck is designed of composite steel a concrete board with crossbars. The footbridge is designed as simple beam with an overhanging end. Length span is 34.8 m, length overhanging ends is 5.8 meters. The total length of the footbridge is 40.6 meters. Width of footbridge is 2.8 meters. Free width is 2 meters. In the cross point with the axis of local road is height of footbridge above ground 4.43 meters. Next to the building Z, there is a footbridge stored on a concrete support, near the building D, the footbridge is stored on a steel frame of support. The footbridge is deposited on elastomeric bearings. The footbridge is being protected from the weather. The sheating of the building is designed by Wictec 60 system. The master's thesis also contains drawing documentation of the proposed solution.
31
Smělíková, Petra. "Přemostění řeky Svitavy a tratě ČD v Blansku." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227189.
Full textAbstract:
The aim of the Diploma Thesis is elaboration of study of bridge crossing over the Svitava river and ČD railway track in Blansko. It concerns a five-pole steel beam road bridge with through-span which carries road of the third category. The static system of the construction is solved as solid-web beam of 1.3 meters height which is in three middle spans reinforced by truss construction with top chord and system of diagonals without verticals. The height of the main beam where reinforced by trusswork is 4.75 meters. The width of spans in the road axis is 18.5 + 30.525 + 44.4 + 30.525 + 18,5 metres. The bridge deck consists of steel cross beams bonded with reinforced concrete slab of 200 millimeters of thickness. The drive-through width of the roadway is 7.0 meters. The bridge is fitted with right-sided walkway placed on steel cantilevers. The walk-through width of the walkway is 3.0 meters. Material used is S355 Steel, C30/37 Concrete and S460 Steel which is used for marginal spans of the bridge. Load-bearing construction is assessed in compliance with current technical requirements laid down by European Directives, so called “Eurocodes”. The calculation of inner powers is performed using the Scia Engineer 2013.1 software.
32
Hedric, Andrew C. "Dynamic Behaviors of Historical Wrought Iron Truss Bridges – a Field Testing Case Study." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc822751/.
Full textAbstract:
Civil infrastructure throughout the world serves as main arteries for commerce and transportation, commonly forming the backbone of many societies. Bridges have been and remain a crucial part of the success of these civil networks. However, the crucial elements have been built over centuries and have been subject to generations of use. Many current bridges have outlived their intended service life or have been retrofitted to carry additional loads over their original design. A large number of these historic bridges are still in everyday use and their condition needs to be monitored for public safety. Transportation infrastructure authorities have implemented various inspection and management programs throughout the world, mainly visual inspections. However, careful visual inspections can provide valuable information but it has limitations in that it provides no actual stress-strain information to determine structural soundness. Structural Health Monitoring (SHM) has been a growing area of research as officials need to asses and triage the aging infrastructure with methods that provide measurable response information to determine the health of the structure. A rapid improvement in technology has allowed researchers to start using new sensors and algorithms to understand the structural parameters of tested structures due to known and unknown loading scenarios. One of the most promising methods involves the use of wireless sensor nodes to measure structural responses to loads in real time. The structural responses can be processed to help understand the modal parameters, determine the health of the structure, and potentially identify damage. For example, modal parameters of structures are typically used when designing the lateral system of a structure. A better understanding of these parameters can lead to better and more efficient designs. Usually engineers rely on a finite element analysis to identify these parameters. By observing the actual parameters displayed during field testing, the theoretical FE models can be validated for accuracy. This paper will present the field testing of a historic wrought iron truss bridge, in a case study, to establish a repeatable procedure to be used as reference for the testing of other similar structures.
33
Nádvorník, Ondřej. "Návrh mostní konstrukce na rychlostní komunikaci." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226420.
Full textAbstract:
This Master's thesis deals with the detailed design of the supporting structure of the bridge with two sections, with the rise in the direction of the intermediate support, and cross-cut single-beam construction. The supporting structure is designed from the prestressed concrete, prestressing losses are accurately quantified. It also deals with the assessment of pillar base threshold and pilot groups. The assessment was carried out according to the limit states.
34
Chen, Rong-Zong, and 陳榮宗. "The structural behavior of truss bridge of steel-LER 45 steel truss bridge as an example." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/49127758187221724456.
Full textAbstract:
碩士國立高雄第一科技大學
營建工程所
97
With higher stiffness, Warrant Type steel truss bridge has been widely used in the railway bridge systems, such as the High speed railway and Kaohsiung Rapid Transit system. Lateral bracing system, such as the floor beams and the diagrams are designed to provide the rigidity of the bridge. However, the distortion-induced fatigue may become significant with such lateral bracings. In this study, numerical analysis was carried out to examine the effect of the diagrams on the fatigue behavior of the LER 45 Warrant Type steel truss bridge. Both the stress-induced fatigue problem and distortion-induced fatigue problems are included in this study. The parameters examined in this study including the spacing of the diagrams and floor beams, the thickness of the girder web. Based on research results, it is found that the stress concentration and the out-of-plane deformation increase with the increasing of the spacing of the lateral supports, but decreases with the increasing of the web thickness. And, the out of plane deformation is significant if the depth-to-thickness ratio of the girder web is larger than the critical value of 160. It is suggested to be considered out-of-plane deformation in design of Warrant Type steel truss bridge if the depth-to-thickness ratio is larger than the critical value.
35
Hung, Pei-Ching, and 洪珮菁. "Design and analysis of steel railway truss bridge." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/58272923653538447972.
Full textAbstract:
碩士中華科技大學
土木防災工程研究所
98
This research focused on a continuous steel truss curved railway bridge structure analysis in the planning: preliminary design and detailed design stages, by using SAP90 structure analysis software program, established two-dimensional and three-dimensional model and compare the results. In addition to the railway bridge eastbound and westbound track, there are a total of three track live load lanes included cargo track. The steel truss curved railway bridge style is fitted with the mechanical behavior of three-span continuous structures. There is no similar domestic bridge, hoping to be able to provide a reference for the future bridge design.
36
Bowen, Charles Merrill. "Analysis, testing, and load rating of historic steel truss bridge decks." Thesis, 2003. http://wwwlib.umi.com/cr/utexas/fullcit?p3110731.
Full text
37
Chang, Chun-Hao, and 張均豪. "Optimum Design of Steel Truss Bridge Members Using the Improved Genetic Algorithm." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/54139835599185724488.
Full textAbstract:
碩士國立臺灣科技大學
營建工程系
104
It has been always a challenge for engineers to find a balance between safety and economy in the structural design. To achieve this goal, the potential of using genetic algorithm (GA) to determine member sizes of 2D steel truss bridges is investigated in this study. Compared to the previous studies, this research is highlighted with (1) an self-developed structural analysis program that provides the author more flexibility to consider moving live load and the 3 limit states(2) the improved GA that include initial search, penalty parameter, elistic strategy and auto-tuning. The potential of using the improved GA is investigated though a simple example with the lightest but feasible member sizes obtained from the exhaustive method. After that, Taguchi method is conducted to determine the parameters in the improved GA, and (3) the efficiency of the improved GA is compared with the conventional GA through an approximately full-scale design case.. According to the research results, the following conclusions are drawn: (1) For a simple design case, the use of exhaustive method and the improved GA provide the same results. However, the analysis time spent by the exhaustive method is greater than 30 days while the average time spent by the improved GA for 10 analyses is about 6 minutes. (2) For the approximately full-scale design case, the efficiency of conventional GA is greatly improved by the improved GA but engineering judgement is still necessary to examine the results from the improved genetic algorithm.
38
Pollino, Michael. "Analytical and experimental investigation of a controlled rocking approach for seismic protection of bridge steel truss piers." 2007. http://proquest.umi.com/pqdweb?did=1397912751&sid=1&Fmt=2&clientId=39334&RQT=309&VName=PQD.
Full textAbstract:
Thesis (Ph.D.)--State University of New York at Buffalo, 2007.Title from PDF title page (viewed on Feb. 28, 2008) Available through UMI ProQuest Digital Dissertations. Thesis adviser: Bruneau, Michel. Includes bibliographical references.
39
Hafner, Anthony G. "Experimental research on the behavior and strength of large-scale steel gusset plates with sway-buckling response including effects of corrosion and retrofit options." Thesis, 2012. http://hdl.handle.net/1957/28486.
Full textAbstract:
The collapse of the I-35W Bridge in Minneapolis, MN on August 1, 2007 brought into question the design and inspection of gusset plates in steel truss bridges. The experimental tests performed in this research study the sway-buckling strength and behavior of large-scale steel gusset plates in an isolated truss connection. Parameters studied include plate thickness,combination member loading, initial out-of-plane imperfection, diagonal compression member out-of-plane flexural stiffness, corrosion, and alternative retrofits to increase lateral stiffness. The flexural stiffness of the diagonal compression member and retrofit designs were unique to
the testing program. The variables monitored during testing include gusset plate surface stresses and strains, member axial strains, out-of-plane displacement of the gusset plate free
edge, and buckling capacity. The results were compared with previously established design models for predicting buckling capacity of gusset plates which include the Whitmore effective
width, the Modified-Thornton method, and the FHWA Load Rating Guidelines. A parametric finite element model was developed to determine the lateral stiffness of the gusset plate
connection and the additional stiffness provided by the alternative retrofit options.
The results showed interaction between the diagonal compression member and gusset plate occurs, which affects sway-buckling capacity. Combination of member loads showed evidence of detrimental effects on sway-buckling capacity. Corrosion of the gusset plates along the top edge of the bottom chord did not lead to significant reduction in sway-buckling capacity. The two retrofit designs showed increases in both lateral stiffness and buckling capacity as well as economic benefits over traditional retrofit methods. Comparison of the results to the current design guidelines showed that the current methods are conservative and
do not accurately represent the true behavior of gusset plate connections. The research concludes with two proposed models for future use in design and retrofit of gusset plates. The
first is a member-gusset plate interaction model based on a stepped column analogy that takes into account the effects of member flexural stiffness and gusset plate stiffness. The second is
a general design guideline developed for retrofit of gusset plate connections dominated by sway-buckling behavior which uses a stiffness based approach to increase the capacity of gusset plate connections.Graduation date: 2012
40
Nettis, Andrea. "Seismic fragility and risk assessment of large bridge portfolios: efficient mechanical approaches based on multi-source data collection and integration." Doctoral thesis, 2021. http://hdl.handle.net/11589/229598.
Full textAbstract:
In earthquake-prone countries, most of the existing bridges were designed in the past without appropriate anti-seismic regulations and can induce important direct or indirect losses if subjected to severe seismic ground shaking. The main challenges in the extensive seismic risk assessment of existing bridges are related to the large number of structures to be inspected and the limited available resources. Therefore, time- and cost-saving approaches for providing seismic risk metrics on existing bridges are needed. This dissertation investigates efficient methodologies for bridge-specific seismic risk assessment within portfolio analysis by using multi-source data integration and simplified mechanical approaches.
A methodology for multi-source data collection is described. The applicability of remote-sensing data in populating inventory for structural analysis purposes is discussed. A procedure for using Remotely Piloted Aircraft Systems and photogrammetry to retrieve exhaustive structural information is presented.
The effectiveness of displacement-based assessment approaches to be used together with the capacity spectrum method (CSM) for seismic performance assessment is analysed, considering continuous-deck reinforced-concrete (RC) and steel truss multi-span bridges.
A fragility analysis methodology based on cloud analysis using the CSM results is also presented. The CSM is applied with real (i.e. recorded) ground-motion spectra (as opposed to code-based conventional spectra) to explicitly consider record-to-record variability.
A seismic risk assessment framework combining the proposed efficient data collection and simplified probabilistic seismic assessment methodologies is finally presented. It accounts for the influence of knowledge-based uncertainties associated with an initial incomplete data collection. The proposed approach is applied and tested on eight simply-supported RC bridges of the Basilicata national road network.
41
DePiero, Anthony H. "High cycle fatigue modeling and analysis for deck floor truss connection details." Thesis, 1997. http://hdl.handle.net/1957/33707.
Full textAbstract:
The Oregon Department of Transportation is responsible for many steel deck truss bridges containing connection details that are fatigue prone. A typical bridge, the Winchester Bridge in Roseburg, Oregon, was analyzed to assess the loading conditions, stress levels, and fatigue life of the connection details. The analysis included linear-elastic beam analysis, 2D and 3D finite element modeling, and fatigue modeling. A field identification methodology was developed to expand the analysis to other steel deck truss bridges. Five retrofit strategies were investigated to determine their effectiveness in reducing the stress ranges developed in the connection details.Graduation date: 1998
42
Kriegl, Matthew J. "The preservation of historic, single-lane, metal truss bridges in Hunterdon County, New Jersey : issues, concerns, and techniques." 2011. http://liblink.bsu.edu/uhtbin/catkey/1640184.
Full textAbstract:
This study investigates the complex issues surrounding the preservation of historic, single-lane, metal truss bridges. Essentially functionally obsolete, these structures are targeted for replacement due to current government transportation policies, funding requirements, and safety concerns. After these issues are discussed, a series of case studies from Hunterdon County, New Jersey, will highlight multiple bridge rehabilitation projects in which designs and plans were modified to suit the unique situations and conditions of each of these structures, without compromising historic integrity and improving safety. These bridges have important cultural value, and although in some cases the original structure may be lost or wholly reconstructed, the historic character of the bridge and area is retained. This thesis illuminates the difficulties that need to be overcome in attempting to successfully preserve historic, single-lane bridges and their rural context (while maintaining transportation functionality), and illustrates the important role of community involvement in the preservation process.Department of Architecture