Academic literature on the topic 'Load-bearing wall system'
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Journal articles on the topic "Load-bearing wall system"
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Osman, S. A., Zawawi Samba Mohamed, A. R. Sulaiman, and M. Fikri Ismail. "Experimental Analysis of Interlocking Load Bearing Wall Brickool System." Key Engineering Materials 594-595 (December 2013): 439–43. http://dx.doi.org/10.4028/www.scientific.net/kem.594-595.439.
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This paper presents the results of investigation on structural behavior of the load bearing walls of interlocking bricks system called Brickcool. The model of Brickcool load bearing walls with and without reinforcement were tested in the laboratory until they failed. Both models were prepared with the same dimension of 1.3 m height, 1.0 m wide and 125 mm width. The influence of reinforcement on the deflection and strain of the load bearing walls were examined. Physical and mechanical tests of the individual brick were also been carried out. Results of this study proved that the model of load bearing wall with reinforcement have higher failure load with lower displacement at the top of the wall. The presence of reinforcement in strengthening the wall panel also increase the compression and tension strain compared to the wall panel without reinforcement. The physical and mechanical test results also found that the bricks have satisfied the minimum requirement values set by the British and American Standards.
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Keerthan, Poologanathan, and Mahen Mahendran. "Thermal Performance of Load Bearing Cold-formed Steel Walls under Fire Conditions using Numerical Studies." Journal of Structural Fire Engineering 5, no. 3 (August 19, 2014): 261–90. http://dx.doi.org/10.1260/2040-2317.5.3.261.
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Cold-formed Light gauge Steel Frame (LSF) wall systems are increasingly used in low-rise and multi-storey buildings and hence their fire safety has become important in the design of buildings. A composite LSF wall panel system was developed recently, where a thin insulation was sandwiched between two plasterboards to improve the fire performance of LSF walls. Many experimental and numerical studies have been undertaken to investigate the fire performance of non-load bearing LSF wall under standard conditions. However, only limited research has been undertaken to investigate the fire performance of load bearing LSF walls under standard and realistic design fire conditions. Therefore in this research, finite element thermal models of both the conventional load bearing LSF wall panels with cavity insulation and the innovative LSF composite wall panel were developed to simulate their thermal behaviour under standard and realistic design fire conditions. Suitable thermal properties were proposed for plasterboards and insulations based on laboratory tests and available literature. The developed models were then validated by comparing their results with available fire test results of load bearing LSF wall. This paper presents the details of the developed finite element models of load bearing LSF wall panels and the thermal analysis results. It shows that finite element models can be used to simulate the thermal behaviour of load bearing LSF walls with varying configurations of insulations and plasterboards. Failure times of load bearing LSF walls were also predicted based on the results from finite element thermal analyses. Finite element analysis results show that the use of cavity insulation was detrimental to the fire rating of LSF walls while the use of external insulation offered superior thermal protection to them. Effects of realistic design fire conditions are also presented in this paper.
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Xu, Ming, Zhong Fan Chen, and Wei Jie Zhang. "Experimental Study on the Seismic Behavior of Concrete Composite Bearing Walls." Advanced Materials Research 163-167 (December 2010): 1090–95. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.1090.
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Concrete composite bearing wall system is an innovated composite structure system, which is assembled by load-bearing walls, enclosure walls and thermal protection and insulation layers. Four concrete composite bearing walls were tested quasi-statically under low cyclic lateral loads. The characteristics including failure modes, hysteretic characteristics, ductility and stiffness degradation are investigated. It is shown that the concrete composite bearing walls possess high strength and ductility. In the elastic stage, the prefabricated slabs and frame could work together very well, and the composite walls exhibited enough stiffness against lateral deformation. With increasing horizontal load, the stiffness of the prefabricated slabs tended to decrease, and finally the composite wall system failed by flexural failure of frame structure with dense columns.
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Bosakov, S. V., A. I. Mordich, A. A. Karyakin, S. A. Sonin, and I. S. Derbentsev. "Distribution of Load Forces in Hollow Core Slabs of Precast Solid Floor Supported on Bearing Walls." Science & Technique 18, no. 2 (April 17, 2019): 93–103. http://dx.doi.org/10.21122/2227-1031-2019-18-2-93-103.
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The need to cut construction cost of residential and public buildings and provide them with a free and transformable planning structure during their operation cause interest in building wall systems with a large step of bearing walls. In order to reduce labor inputs and increase rate of construction in such building load-bearing system it is also necessary to maximize the use of large-sized prefabricated products and minimize consumption of in-situ concrete. In this case prefabricated products should be substituted according to the conditions of local (regional) construction industry base and volume of in-situ concrete must be sufficient to ensure a complete redistribution of internal forces between elements of the bearing system under load. As for the described bearing wall system of a multi-storey building the paper presents a flat precast solid floor formed by hollow-core slabs and monolithic crossbars supported by load-bearing walls. The hollow-core slabs supported at the ends on cast-in-place crossbars in the planes of bearing walls are arranged in dense groups between cast-in-place braced cross-beams. Dense contacts between overlapping elements are fixed by internal bonds. New data on distribution of forces in floor elements under the action of a vertical load have been obtained on the basis of full-scale tests and existing theoretical assumptions. It has been established that due to this load reactive thrust forces ensuring an operation of every hollow-core slab group in the floor as an effective solid plate supported along the contour have been originated in the floor plane along two main axes. Calculation of the reactive thrust forces makes it possible more accurately to assess a load-bearing capacity and rigidity of the precast solid floor and to increase a step of bearing walls up to 8 m and more while having hollow-core slabs with a thickness of 220 mm.
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Pan, Li Cheng, Xi Yan Wang, and Deng Feng Wang. "Influence of Stressed Skin Effect on the Bearing Capacity of Electrostatic Precipitator Casing Wall." Advanced Materials Research 1049-1050 (October 2014): 246–50. http://dx.doi.org/10.4028/www.scientific.net/amr.1049-1050.246.
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In wall-column structural system of electrostatic precipitator casing, wall will share the load with column and provide lateral bracing support when the load is applied on the column .Then the wall panel exert the stressed skin effect, which will influence its load bearing capacity. By nonlinear finite element method, when wall panel exerts stressed skin effect, whether the effect will influence the wall bearing capacity is investigated as well as the failure mode. The relationship is analyzed between the loading level onto column, panel thickness, loading form onto wall and the affecting degree on the bearing capacity of wall panel. The computation results indicate that the bearing capacity of wall panel is lower when it exerts the stressed skin effect. When the wall is thin, the weakening degree of panel bearing capacity resulting from stressed skin effect is slightly affected by loading level onto column. When the wall is thicker, the weakening degree of panel bearing capacity increases apparently as the loading level onto column increases. For a certain loading level onto column, compared with the locally loaded wall panel, the impact on load bearing capacity is greater for the globally loaded wall panel. Research work has reference value for the calculation and design of enclosure structures of electrostatic precipitator casing.
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Oktavianus, Yusak, Kasun Shanaka Kristombu Baduge, Kristopher Orlowski, and Priyan Mendis. "Structural behaviour of prefabricated load bearing braced composite timber wall system." Engineering Structures 176 (December 2018): 555–68. http://dx.doi.org/10.1016/j.engstruct.2018.09.037.
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Rusthi, Mohamed, Poologanathan Keerthan, Mahen Mahendran, and Anthony Ariyanayagam. "Investigating the fire performance of LSF wall systems using finite element analyses." Journal of Structural Fire Engineering 8, no. 4 (December 11, 2017): 354–76. http://dx.doi.org/10.1108/jsfe-04-2016-0002.
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Purpose This research was aimed at investigating the fire performance of LSF wall systems by using 3-D heat transfer FE models of existing LSF wall system configurations. Design/methodology/approach This research was focused on investigating the fire performance of LSF wall systems by using 3-D heat transfer finite element models of existing LSF wall system configurations. The analysis results were validated by using the available fire test results of five different LSF wall configurations. Findings The validated finite element models were used to conduct a parametric study on a range of non-load bearing and load bearing LSF wall configurations to predict their fire resistance levels (FRLs) for varying load ratios. Originality/value Fire performance of LSF wall systems with different configurations can be understood by performing full-scale fire tests. However, these full-scale fire tests are time consuming, labour intensive and expensive. On the other hand, finite element analysis (FEA) provides a simple method of investigating the fire performance of LSF wall systems to understand their thermal-mechanical behaviour. Recent numerical research studies have focused on investigating the fire performances of LSF wall systems by using finite element (FE) models. Most of these FE models were developed based on 2-D FE platform capable of performing either heat transfer or structural analysis separately. Therefore, this paper presents the details of a 3-D FEA methodology to develop the capabilities to perform fully-coupled thermal-mechanical analyses of LSF walls exposed to fire in future.
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Fofiu, Mihai, Andrei Bindean, and Valeriu Stoian. "Carbon Fiber Strips Retrofitting System for Precast Reinforced Concrete Wall Panel." Key Engineering Materials 660 (August 2015): 208–12. http://dx.doi.org/10.4028/www.scientific.net/kem.660.208.
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This paper presents the retrofitting procedure used on a precast reinforced concrete wall panel (PRCWP) in order to restore its initial load bearing capacity. The specimen used in this experimental test is one from the residential multistoried buildings constructed in Romania from the 1970 onwards. All of the characteristics of the element are from the specific era, only scaled down with a factor of 1:1,2. The element was subjected to in-plane reversed cyclic loading to simulate its seismic behavior and obtain its maximum load bearing capacity. After the test we retrofitted the element using Carbon Fiber Strips Externally Bonded (EBR) and anchored with Carbon Fiber Reinforced Polymers (CFRP) mesh. The porpoise of the paper is to compare the maximum loading bearing capacity of the unstrengthen and strengthen elements in order to compare them and examine the efficiency of this retrofitting procedure.
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Zhu, Min Wei, and Yuan Zhen Liu. "Experimental Study on the Seismic Performance of Composite Shear Wall Structure with Thermal-Insulation Wall Form." Advanced Materials Research 295-297 (July 2011): 1489–93. http://dx.doi.org/10.4028/www.scientific.net/amr.295-297.1489.
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The composite shear wall system with permanent thermal-insulation wall form of glazed hollow bead is a new kind of energy-saving building. the experimental study on the seismic performance of composite shear wall structure was proposed. Through the tests of the walls with different shear-span ratio and axial compression ratio under vertical force and low cyclic horizontal load, the seismic behaviors of slitted shear walls under low cyclic load tests were studied. Through the expemental study, the calculation methods for load-bearing capacity of walls with different shear-span ratio were obtained. And then the laws for the energy dissipation and ductility feature were revealed. Besides, the comparison analysis were made on the seismic behaviors between composite shear walls and common shear walls.The study could provide a foundation for the designing evaluating on the performance for the new structure.
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Girhammar, Ulf Arne, and Bo Källsner. "Tests and Analyses of Slotted-In Steel-Plate Connections in Composite Timber Shear Wall Panels." Advances in Civil Engineering 2017 (2017): 1–20. http://dx.doi.org/10.1155/2017/7259014.
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The authors present an experimental and analytical study of slotted-in connections for joining walls in the Masonite flexible building (MFB) system. These connections are used for splicing wall elements and for tying down uplifting forces and resisting horizontal shear forces in stabilizing walls. The connection plates are inserted in a perimeter slot in the PlyBoard™ panel (a composite laminated wood panel) and fixed mechanically with screw fasteners. The load-bearing capacity of the slotted-in connection is determined experimentally and derived analytically for different failure modes. The test results show ductile postpeak load-slip characteristics, indicating that a plastic design method can be applied to calculate the horizontal load-bearing capacity of this type of shear walls.
Dissertations / Theses on the topic "Load-bearing wall system"
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Guler, Gokay. "Effect Of Inelastic Behaviour Of Load Bearing Walls On The Frame." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12610566/index.pdf.
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The purpose of this study is to investigate the influence of material and geometric nonlinearities occurring in beams, columns and walls of RC frame-wall structural systems when undergoing severe ground excitations. For this purpose, a low-rise RC building is considered with and without walls, and the joining beams and columns are designed with the strong-column weak-beam concept. The dimensions, material properties and the reinforcement amounts are calculated in accordance with the values suggested in design codes. Each structure is analyzed for various levels of applied vertical force and change in wall stiffnesswhere the effect of geometric nonlinearity is considered for each case. Force formulation frame elements with spreading inelasticity over the span are used for the modelling of each beam, column and wall. The coupling of the section forces is obtained by the fibre discretization of the section into several material points. Each section is divided into confined and unconfined regions and appropriate material properties are used for concrete and steel for cyclic loading. Both static pushover and dynamic analyses are performed in order to replicate the worst case scenario for a possible earthquake. From this study, it is concluded that the beams and columns of a frame-wall structural system should be designed carefully for load redistributions resulting from the yielding of the wall in the case of a strong earthquake, thus the design codes should address this situation for both in the retrofit of existing frame buildings with walls and in the construction of new frame-wall type buildings.
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Janů, Kateřina. "Mateřská škola." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226573.
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This thesis solves the project of materniti house in moderate terrain. Materniti house is located on the grounds numbers 1475 in the village Jezeřany - Maršovice. The building has two floors. Materniti house is designed for 60 children and 15 employees. Building serves as a pre-school institution for the education of children. The buiding has a load-bearing wall system. The outer walls, load–bearing walls and partitions are from ceramic blocks POROTHERM. Wall is insulated with mineral wool BAUMIT thickness of 100 mm. The ceilings are made of prestressed hollow panels Spiroll HCE 250 thickness of 250 mm. The roof of building is part of the aisle, made of wooden trusses with an inclination of 12°. Truss consists of hunter cased sloping roof. The second part of building consists of single-layer flat roof. The facade is part of non-ventilated and ventilated by fiber-cement boards CEMBRIT. Windows are plastic DESIGN by VEKRA. Balcony two-doors are plastic VEKRA CLASITIC VD. Entrance two-doors are wooden VEKRA NATURA 68.
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Křenek, Vojtěch. "Mateřská škola." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-372005.
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The aim of my diploma thesis is to elaborate project documentation for the execution of a new building of kindergarten. The intention is to construct a new kindergarten which access preschool-age children has visual contact with nature and space of outside. This is purpose why all main windows face south. In the second floor is situated schoolroom for minor activity. The building is designed as brick, using clay blocks which are put on concrete foundation strips. Basement walls are from formwork brick fill concrete and steel armature. Thermal insulation is from contact thermal insulation system and ventilated facade with wood clapboard from pine (Thermowood). The roofing is designed partly as single-shell vegetative (extensive) roof and partly as a float double-shell roof with timber truss girder. Ceiling construction in the basement and the first floor is from concrete load-bearing structure.
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Bystedt, Gabriella, and Bernuy Fatima Estrada. "Balance between financial and quality gains in housing production : A study on concrete and wooden frames." Thesis, KTH, Byggteknik och design, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-296546.
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With increased demand for housing in Sweden's metropolitan regions, it is of greatimportance to meet the need and build more. The supply of housing is governed byaccess to land and what it costs to build apartment houses. In Sweden, there is ahistory of cartel formation of contractors and at the turn of the millennium, thegovernment invested funds to create increased price transparency in theconstruction sector. Based on this, the purpose of this project is to investigate how itis possible to today produce housing more economically, while maintaining quality.The study is limited to the purchase of prefabricated hollow core and load-bearingwall elements in both concrete and wood. The goal is to be able to compare prices ofthese construction parts between Swedish and foreign suppliers. The foreignsuppliers are limited to the ones operating in the Baltic countries and Poland. Thus, itmust be investigated which of the wooden or concrete frames is most economicallyprofitable, what opportunities there are with international purchases of frameelements and what should be taken into account in international purchases.I och med ökad efterfrågan på bostäder i Sveriges storstadsregioner är det av vikt atti samma takt öka utbudet. Utbudet styrs av tillgång till mark samt vad det kostar attbygga. I Sverige finns en historia av kartellbildning av byggföretag och regeringensatte vid millennieskiftet in medel för att skapa ökad pristransparens inombyggsektorn. Med bakgrund i detta är syftet med examensarbetet att undersöka hurdet idag går att producera bostäder mer ekonomiskt, med bibehållen kvalitet iåtanke. Studien avgränsas till inköp av prefabricerade håldäck och bärandeväggelement i betong respektive trä. Målet är att kunna jämföra priser av dessakonstruktionsdelar mellan svenska och utländska leverantörer. De utländskaleverantörerna avgränsas till att verka inom baltikum och Polen. Således ska detutredas vad utav trä- eller betongstomme som är mest ekonomiskt lönsamt, vilkamöjligheter som finns med internationella inköp av stomelement samt vad som börtas hänsyn till vid internationella inköp.De risker som finns kopplade till just internationella inköp är bland andra risk attprodukten inte stämmer överens med vad som avtalats och leveransförseningar.Logistikrisker begränsas med hjälp av avtal reglerade utifrån det internationellaregelverket Incoterms. Det finns även politiska och valutarelaterade risker medinternationell handel.ISO 9000 är ett kvalitetsledningssystem som ligger till grund för att företag ochorganisationer ska kunna säkerställa att kvaliteten i deras arbete svarar upp motkundens behov och krav. ISO 14000 samlar standarder inom miljöledningssystem.Intervjuer av sex svenska och fem utländska leverantörer om pris och kvalitetsarbetegav intressanta resultat för studien. Samtliga utländska leverantörer är certifierademed ISO 9001 samt ISO 14001. Två av sex svenska bolag har ISO9001-certifieringen och hälften ISO 14001-certifieringen. Att köpa prefabriceradebetongelement är enligt studien inte ekonomiskt lönsammare i utlandet, det är detdäremot att köpa träelement.
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Tobek, Miroslav. "Řešení dopravy v centru Havlíčkova Brodu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-225922.
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The aim of this diploma thesis is the solution of the traffic situation in the city center of Havlíčkův Brod. Mainly the ground road number II/150 adjustment, which consist in the modification of the two-way traffic to one-way traffic organization in the streets Dolní, Žižkova and Na Ostrově by using the analogy of a roundabout layout, is solved within this thesis. All mentioned modifications simplify the traffic situation, improve the orientation and increase the security and the traffic flow mainly in relation to pedestrians and cyclists. Another part of this thesis is focused on revitalization of the public spaces in front of the community center called Ostrov and junction of existing cycle tracks situated on the both banks of the Sázava river. In relation to this topic the adjustment of rainwater sewerage system, low-voltage above ground network, public lighting, communication electric cables, fire brigade signal lights and low-pressure gas pipeline is also solved.
Conference papers on the topic "Load-bearing wall system"
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Memari, A. M., and Joseph A. Standley. "Introduction of a Transparent Sustainable Load-Bearing Wall System with Integrated Photovoltaic for Residential Construction." In Architectural Engineering Conference (AEI) 2011. Reston, VA: American Society of Civil Engineers, 2011. http://dx.doi.org/10.1061/41168(399)17.
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Aviram, A., C. O'Laughlin, R. L. Mayes, R. O. Hamburger, and J. Nielsen. "Development of an Innovative Load-Bearing Steel Stud Wall System for Blast Protection of Building Envelopes." In Structures Congress 2014. Reston, VA: American Society of Civil Engineers, 2014. http://dx.doi.org/10.1061/9780784413357.192.
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Kerkhof, Klaus, Fabian Dwenger, Gereon Hinz, and Siegfried Schmauder. "Influence of Local Wall Thinning and Support Stiffness in Piping Systems on Safety Assessments for Dynamic Loading." In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28703.
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The load bearing behavior of piping systems depends considerably on support distances and stiffness as well as cross section characteristics. Stiffness of supports can often be defined only with difficulty by applying simplified procedures or guidelines based on assumptions. Load cases can be estimated quite well, but the safety assessment of a piping system can only be as reliable as the system model can realistically describe the present support stiffness or imperfections e.g. local wall thinning. As a consequence, the prediction of the system response may be poor. It is likely that calculated frequencies differ from natural frequencies determined experimentally. These frequency shifts lead to unrealistic predictions of stress analysis. Examples for overestimations and underestimations of stress analysis are given regarding the load case earthquake, depending on whether the frequency shift runs into or out of the plateau of the applied floor response spectrum. The influence of local wall thinning on modal characteristics is investigated. Conservative estimations of the influence on the load bearing behavior regarding severe local wall thinning are given. For fatigue checks the linear response of an experimental piping system is calculated and safety margins are demonstrated by comparing calculated with experimental results.
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Mathew, Alka Susan, and Regi P. Mohan. "Analytical Study on Seismic Performance of Aluminium Sandwich Shear Wall with Different Core Shapes." In International Web Conference in Civil Engineering for a Sustainable Planet. AIJR Publisher, 2021. http://dx.doi.org/10.21467/proceedings.112.6.
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Shear walls are efficient monotonic load resisting systems in high rise or super high rise framed structures and hence are the most critical elements in seismic design. This paper focus on application of Aluminium sandwich shear walls (ASSW) consist of aluminium panels as top and bottom plates and aluminium core to serve as seismic protection system. ASSW have the advantage that these are light weight systems with high stiffness to weight ratio and bending strength. These could well replace steel shear walls which are having more structural weight. This paper presents analytical analysis of performance of ASSW under monotonic and seismic loading using ANSYS software. Sandwich shear wall models were first simulated, verified and analysis was carried out. The response of aluminum sandwich shear wall with two different core shapes or configurations are studied to obtain optimum core shape or configuration for maximum load bearing capacity. Then full scale monotonic and cyclic tests were conducted on aluminium sandwich shear wall with optimum core shapes or configurations. The obtained results allow useful information for the selection of aluminium sandwich shear wall in the seismic design of framed structures.
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Lassen, Tom, Andreas Istad Lem, and Geir Imingen. "Load Response and Finite Element Modelling of Bonded Loading Hoses." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23545.
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Steel reinforced bonded vulcanized rubber loading hoses are frequently used in offshore oil loading systems. The hoses are used as offloading system between platforms and shuttle tankers and represent a flexible economical feasible solution for hydrocarbon transfer. The reliability of these hoses throughout the service life is an important issue both with respect to operational availability and with respect to environmental safety. Hence, the load bearing capacity of these hoses and the fatigue endurance become matters of concern and important design topics. Due to the large deformation of these hoses and the complicated composite structure in the hose wall, the hoses are difficult to analyze with respect to the strain and stress response when subjected to the various load cases. The present paper presents extreme load capacity assessments and a fatigue life prediction methodology for bonded loading hoses subjected to high pressure, tension and bending in a catenary configuration and in repeated reeling under high hose tension. The load effects on the hose during the reeling operations and the fatigue life predictions methodology for both steel components and rubber are emphasized in the present work. A combination of advanced finite element modeling and full scale testing to corroborate the analyses results has been carried out to qualify the hoses to be fit for service and to fulfill the API17K requirements. The present paper presents results from advanced finite element models and full scale testing for a 20″ bonded hose with steel end fittings. The investigation brings new knowledge in the field of hose design methodology and the results are discussed in light of current requirements and regulations such as OCIMF and API 17K. A consequence of the comprehensive testing and analysis work is that the requirement for testing in future projects is reduced, and calibrated analysis models can be used to predict hose capacities.
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Vaha-Savo, Lauri, Alejandra Garrido Atienza, Christian Cziezerski, Mikko Heino, Katsuyuki Haneda, Clemens Icheln, Xiaoshu Lu, and Klaus Viljanen. "Passive Antenna Systems Embedded into a Load Bearing Wall for Improved Radio Transparency." In 2020 50th European Microwave Conference (EuMC). IEEE, 2021. http://dx.doi.org/10.23919/eumc48046.2021.9338219.
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Lam, Poh-Sang, Andrew J. Duncan, Lisa N. Ward, Robert L. Sindelar, Yun-Jae Kim, Jae-Yoon Jeong, Hyun-Jae Lee, and Myeong Woo Lee. "Crack Growth Rate Testing and Large Plate Demonstration Under Chloride-Induced Stress Corrosion Cracking Conditions in Stainless Steel Canisters for Storage of Spent Nuclear Fuel." In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-94031.
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Abstract Stress corrosion cracking may occur when chloride-bearing salts deposit and deliquesce on the external surface of stainless steel spent nuclear fuel storage canisters at weld regions with high residual stresses. Although it has not yet been observed, this phenomenon leads to a confinement concern for these canisters due to its potential for radioactive materials breaching through the containment system boundary provided by the canister wall during extended storage. The tests for crack growth rate have been conducted on bolt-load compact tension specimens in a setup designed to allow initially dried salt deposits to deliquesce and infuse to the crack front under conditions relevant to the canister storage environments (e.g., temperature and humidity). The test and characterization protocols are performed to provide bounding conditions in which cracking will occur. The results after 2- and 6-month exposure are examined in relation to previous studies in condensed brine and compared with other experimental data in the open literature. The knowledge gained from bolt-load compact tension testing is being applied to a large plate cut from a mockup commercial spent nuclear fuel canister to demonstrate the crack growth behavior induced from starter cracks machined in regions where the welding residual stress is expected. All these tests are conducted to support the technical basis for ASME Boiler and Pressure Vessel Section XI Code Case N-860.
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Chong, William W. F., and Hedong Zhang. "Simulating Surface Forces Between Iron Oxide Surfaces Immersed in Methyl Oleate Using Molecular Dynamics." In ASME-JSME 2018 Joint International Conference on Information Storage and Processing Systems and Micromechatronics for Information and Precision Equipment. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/isps-mipe2018-8524.
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Using Molecular Dynamics (MD) simulation, the current study determined the surface forces between iron oxide surfaces when immersed in methyl oleate. Condensed-phase Optimized Molecular Potentials for Atomistic Simulation Studies (COMPASS) force field was used to model the methyl oleate molecules. For the nano-confinement simulation, the iron oxide wall was modelled from its crystal structure. The nano-confinement simulation model was setup in a manner where the confined methyl oleate molecules were in contact with the bulk molecules surrounding each side of the iron oxide walls. Through the simulation, the load-separation gap profile was obtained by reducing the separation gap between the ferric oxide walls. When the separation gap was reduced from 2.75 nm to 1.88 nm, the load is shown to increase monotonically. Such increase in load bearing ability of the contact is observed to correspond to a more densely packed methyl oleate molecules, reflected by four well-formed layers across the separation gap. As the gap is dropped from 1.88 nm to 1.63 nm, the load instead reduces, indicating deteriorating load bearing ability of the contact. However, the load bearing ability of the contact is then shown to recover when the gap was further reduced till 1.38 nm. This oscillatory load trend is shown to be as a result of a layer of methyl oleate molecules being squeezed out of contact, corroborated by the density profile change where four well-formed layers were reduced to only three layers from 1.88 nm to 1.38 nm gap. This also indicates that the simulated contact exhibits structural forces, known as solvation forces. Thus, the MD simulation discussed in this study is demonstrated to be capable of providing a foundation to allow for a multi-scale simulation, integrating various force laws at different length scales, to study larger scale tribological contacts.
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Kitamura, Seiji, Masaki Morishita, Shuichi Yabana, Kazuta Hirata, and Katsuhiko Umeki. "Shaking Table Tests With Large Test Specimens of Seismically Isolated FBR Plants: Part 1—Response Behavior of Test Specimen Under Design Ground Motions." In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-77614.
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The seismic isolation technology is planned to introduce to the next generation’s fast breeder reactor (FBR) plants in order to reduce seismic load subjected to components. To grasp the ultimate behavior of a seismically isolated plant under extremely strong earthquake at a level beyond the design ground motions and to establish ultimate strength design methods of seismic isolators, we made a series of shaking table test with large test specimen of seismically isolated FBR plants. The ultimate behavior test was performed using one of the world largest three-dimensional shaking tables “E-Defense” of National Research Institute for Earth Science and Disaster Prevention of Japan to obtain ultimate behavior data of a technologically-feasible large scale model. Test specimen consists of concrete blocks, reinforced concrete walls and isolation layer with six laminated rubber bearing with lead plug (LBR). The gross mass of upper structure of the test specimen is about 600ton. The diameter of the LRB is 505mm that reduced prototype dimensions to about 1/3. In this study, the following three behaviors were assumed as the ultimate behavior of the seismic isolation system; 1) loss of response reduction function of the isolation system by hardening of rubber, 2) non-linear response behavior by the cracking of the concrete wall and 3) braking of the LRB. When the input acceleration level increased, the test specimen was designed to show the ultimate behavior in the above-mentioned order. The ultimate behavior test of the seismic isolation system was carried out on the condition of two input waves by using two test specimen sets of the same dimensions. In this paper, details of the test specimen including the LRB and loading conditions are described. Response behavior of the test specimen under design ground motions is also reported. The restoring force characteristics of the LRBs were stable. The response acceleration of a horizontal direction measured at the upper structure of the specimen was reduced. Prior to the ultimate behavior tests with strong input waves, the response reduction functions of the test specimen under design ground motions were confirmed.
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Defaye, Cyril, Daniel Nelias, and Florence Bon. "Analysis of High-Speed Cylindrical Roller Bearing With Flexible Rings Mounted in a Squeeze Film Damper." In ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44245.
Full textAbstract:
For high-precision mechanical systems such as gas-turbine engines, which operate under extreme conditions, it is particularly important to accurately predict the behavior of the mainshaft rolling bearings. This prediction includes, among others, the load distribution, stiffness and power dissipation. Although shaft speeds tend to increase, rings and shaft walls are becoming thinner due to size and weight constraints. Thus, bearing behavior is no longer independent of the housing and ring stiffness. Furthermore, since forty years, the use of squeeze film damper is largely widespread in gas-turbine engines to significantly reduce the vibratory levels. Due to the flexibility of the ring providing the interface between the roller bearing and the fluid film, it appears an elastic coupling which modifies the behavior of the bearing-squeeze film damper system. This paper presents first a squeeze film damper model with a flexible inner ring (i.e. outer ring of the roller bearing). An analytical stop model is introduced to reproduce the interference between the inner ring of the squeeze film damper and its housing. In a second part, an elastic coupling between the presented squeeze film damper model and an existing roller bearing model is proposed. Finally, the results presented show that this coupling has a first order influence on the behavior of the bearing-squeeze film damper system. It is also shown that the coupling between a roller bearing and a squeeze film damper when linked by a flexible ring introduces a dissymmetry of the load distribution with respect to the applied load direction. Moreover, in certain cases, the position of the bearing in its housing can reach eccentricities larger than the radial clearance of the squeeze film damper.