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Gottron J.,Thorson Baker and Assoctes. | Harries K.A.,University of Pittsburgh | Xu Q.,Shanghai Key Laboratory of New Technology Research on Engineering Structures
Construction and Building Materials | Year: 2014

The phenomenon of creep, particularly in anisotropic and fibre-reinforced materials, is critical to structural design. The objective of this study is to study the creep behaviour of bamboo in particular considering the effect of specimen orientation. The experiment is motivated by the restriction of sustained load on various materials, particularly fibre reinforced materials, due to creep. In this study, half of the radially-cut Bambusa stenostachya (Tre Gai) specimens subjected to a sustained load were oriented so that the fibre-rich outer culm wall is in tension; the other half were loaded so that the outer culm wall is in compression. All tests were conducted in accordance with, and assessed based on, established creep test standards for wood. The orientation of the specimen was found to have significant effect on both the creep behaviour and residual strength of creep-conditioned specimens. The results showed that the bamboo loaded with the outer culm-wall in tension (OT) exhibited (a) a larger modulus of rupture; (b) a lower apparent modulus of elasticity; and (c) a lower residual strength when compared to specimens with their outer culm-wall in compression (OC). In terms of post-creep residual strength, creep conditioning appeared to have a strengthening effect on OC specimens and a detrimental on OT specimens. Results were assessed against common design values for timber and it concluded that the Tre Gai bamboo is seemingly better able to withstand higher sustained loads than timber. © 2014 Elsevier Ltd. All rights reserved. Source


Lu X.,Tongji University | Wang J.,Tongji University | Zhang F.,Shanghai Key Laboratory of New Technology Research on Engineering Structures | Zhang F.,Shanghai Research Institute of Building Sciences
Computers and Structures | Year: 2013

A special DEM (distinct/discrete element method) model employing spring model designed for RC members is proposed to simulate seismic collapse of spatial RC frame structures. The failure criteria are developed. Methods to get the rotational displacement and the contact detection algorithm prove good accuracy and efficiency. Taking advantages of this model, a Visual C++6.0 based simulation program, 3DCollap1.0, is developed and then verified by simulating the shaking table test of a RC frame featuring strong-beam-weak-column from minor and moderate earthquakes to severe earthquake which results in structural collapse. The collapse process of a strong-column-weak-beam RC frame is also successfully simulated. © 2013 Elsevier Ltd. All rights reserved. Source


Chun Q.,Nanjing Southeast University | Chun Q.,Shanghai Key Laboratory of New Technology Research on Engineering Structures | Sun L.X.,Nanjing Southeast University
Advanced Materials Research | Year: 2013

Lounge bridges in Taishun are a special type of Chinese traditional timber structure. Wenxing Lounge Bridge is a famous bridge of them. The analysis of structural performance and damages for Wenxing Lounge Bridge is the foundation of its repair and reinforcement. The performance degradation of wood material and the action of strong external force and the effect of environmental changing and the factor of unfavorable human-activity have continuously accelerated the damage of the bridge. After visiting local craftsmen, building technics and detailed conformations of the bridge are researched. The FEM analyses on the structure before damaged and after damaged are carried out respectively. Damages' reasons of the bridge are then generally analyzed and repair design of the bridge is also presented. © (2013) Trans Tech Publicutions, Switzerland. Source


Liu F.-T.,South China University of Technology | Wu B.,South China University of Technology | Wu B.,Shanghai Key Laboratory of New Technology Research on Engineering Structures | Wei D.-M.,South China University of Technology
Gongcheng Lixue/Engineering Mechanics | Year: 2011

Test results of five concrete beams in fire are presented in this paper, four of which were strengthened with carbon fiber sheet and protected by passive fire insulation, and the other un-strengthened one was tested as a comparison. The primary objectives of these tests are to investigate the influence of flexural cracks at mid span on the temperatures of tensile reinforcements, and to evaluate the failure mode, deformation and fire resistance of the strengthened beams with relatively thin fire insulation. Test results show that: (a) the deflection and crack width and depth of the beam increase very slowly for a long duration of the fire, as a result, the effect of flexural cracks at mid span on the temperatures of tensile rebars is very limited; (b) spalling and debonding of concrete at beam soffit may cause a change of the failure location of the strengthened beam in fire; and (c) in the case that the actual load ratio is not larger than 0.5, the fire endurance of a strengthened beam with relatively thin fire insulation (e.g., 10 mm-20 mm) can meet the requirement of 2 h in design code. Source


Wang Z.,Nanjing University of Technology | Wang Z.,Shanghai Key Laboratory of New Technology Research on Engineering Structures | Liu W.,Nanjing University of Technology | Wei W.,Nanjing University of Technology | Ye Y.,Nanjing University of Technology
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2012

Quasi-static tests on three reinforced concrete composite shear walls with level splice and one reinforced concrete composite shear wall without level splice under cyclic loading were reported. Quasi-static test on one reinforced concrete shear wall under cyclic loading was reported too. The deformation properties and failure mode were discussed. The bearing capacity, hysteretic loops, skeleton curves, ductility and energy-dissipation were analyzed. Test results indicate that the mechanical behavior of the reinforced concrete composite shear walls with level splice and the reinforced concrete composite shear wall without level splice is the same as that of the reinforced concrete shear wall. The study shows that the reinforced concrete composite shear walls with level splice have good seismic behavior. The detailing requirements of the level splice are reasonable, and the load-carrying capacity of the reinforced concrete composite shear walls with level splice is greater than that of the reinforced concrete composite shear wall without level splice. The prefabricated parts and the cast-in-situ concrete parts of the reinforced concrete composite shear walls can work together very well under loading. Source

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