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Wang W.,Tongji University | Zhou Q.,Tongji University | Zhou Q.,CITIC General Institute of Architectural Design and Research Co. | Chen Y.,Tongji University | And 2 more authors.
Journal of Constructional Steel Research | Year: 2013

This paper presents an experimental investigation on two full-scale tension-only concentrically braced beam-through frames (TOCBBTFs) with through beam bolted connections. This type of TOCBBTF system features cold-formed square-tube section columns connected to H-section through beams by bolted end plate. It is commonly used in low-rise prefabricated buildings. Two two-story, four-span by one-span TOCBBTFs subjected to design vertical load were cyclically loaded horizontally to examine the seismic behavior. Stable behavior was observed up to a story drift angle of 1/10. The cyclic behavior was characterized by a linear response, followed by a slip range and a significant hardening response. Deteriorating pinched hysteresis was observed due to the occurrence of cyclic brace compression buckling and tension yielding. The structural damage evolution, ductility, stiffness and shear force distribution of the TOCBBTFs were investigated. Moreover, the finite element software ABAQUS was used to investigate the behavior of TOCBBTF by nonlinear analysis. Semi-rigid analysis produced the most reasonable prediction including initial lateral stiffness and peak story shear. The calibrated numerical models can be employed to launch further studies for this structural system. © 2012 Elsevier Ltd. All rights reserved. Source

Zha X.,Harbin Institute of Technology | Wan C.,Harbin Institute of Technology | Fan Y.,CITIC General Institute of Architectural Design and Research Co. | Ye J.,Lancaster University
Computational Materials Science | Year: 2013

This paper presents a numerical approach using the discrete element method (DEM) to simulate failure modes of metal skinned sandwich panels subjected to uniform pressure. The panels were modeled by assemblies of small size particles that interact with each other through contacts. Different constitutive laws are introduced for the contacts to represent the stiffness and strength characteristics of the metal panels and the core materials. Parametric studies are conducted first to assess the influence of particle radius and friction coefficient on the numerical predictions. The model is then used to predict the mechanical behavior of four sandwich panels with different geometry. The panels are also tested in the laboratory and the test results are compared with the predictions. The comparisons suggest that the DEM model can be used as an alternative tool to predict stiffness and strength of sandwich composites. Moreover the approach can predict detailed local damage and failure modes, which is an advantage over the conventional numerical methods, such as the finite element method. © 2012 Elsevier Ltd. All rights reserved. Source

Wen P.F.,Wuhan University of Technology | Xu P.P.,CITIC General Institute of Architectural Design and Research Co. | Ding K.,Wuhan University of Technology
Applied Mechanics and Materials | Year: 2014

It is one of the keys that determining reasonable damping block geometry in the process of designing the extrusion dies. In this paper, the finite element software POLYFLOW was used to simulate the flow process of tread rubber in the head channel. In addition, the orthogonal experiment method was adopted for the optimum design of the damping block in the head channel. After optimum design, the flow velocity of rubber melt becomes more uniform in the full width at the head outlet. Consequently, the warping deformation of the rubber, which flow through the head channel, is also significantly reduced. © (2014) Trans Tech Publications, Switzerland. Source

Shi G.,Tsinghua University | Fan H.,CITIC General Institute of Architectural Design and Research Co. | Bai Y.,Monash University | Zheng J.,Beijing Building Construction Research Institute
Proceedings of the Institution of Civil Engineers: Structures and Buildings | Year: 2015

Damage such as cable pre-stress loss and anchorage failure may occur in a glass curtain wall structure supported by single-layer plane cable net but the influence on overall structural responses has not yet been identified. A finiteelement model considering the stiffness contribution from glass panels is established to study the effects of two forms of damage: pre-stress loss and anchorage failure. The accuracy and reliability of the numerical model are validated experimentally, and the effects of stiffness of the glass panel on stress distributions are discussed. Compared to experimental results, the finite-element model has sufficient accuracy to quantify the damage effects. The contribution from bending stiffness of glass panels to overall structural stiffness is identified as about 10.6% and that from the glass panel membrane effect is about 12.2%. The modelling approach is extended to describe a realistic 15 × 3 15 m glass curtain wall structure. The corresponding parametric analysis demonstrates that the stiffness contribution from glass panels depends on certain design parameters (e.g. number of glass grids and overall span), but can be ignored for structures with more than ten grids. In the investigated structures with 6~15 grids, almost no difference was found between the effects of damage on the glass curtain wall structure and on the pure supporting cable net structure. © ICE Publishing: All rights reserved. Source

Hu X.,Wuhan University | He H.,CITIC General Institute of Architectural Design and Research Co. | Jiang W.,Wuhan University
Resources, Environment and Engineering - 2nd Technical Congress on Resources, Environment and Engineering, CREE 2015 | Year: 2016

Structures subjected to violent ground shaking may be left in a displaced condition. This residual or permanent displacement may render the structures unsafe or irreparable. This paper presents the results of a parametric study aimed to construct the constant-ductility Residual Displacement Ratio (RDR) response spectrum of bilinear Single- Degree-of-Freedom (SDOF) systems subjected to strong earthquake ground motions. The RDRs, which are defined as the ratios between the residual displacement and the yield displacement, were computed using nonlinear time history analyses of bilinear SDOF systems subjected to 100 scaled ground motions. The results were statistically organized to establish the constant-ductility RDR response spectrum. © 2016 Taylor & Francis Group, London. Source

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