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Shi G.,Tsinghua University | Shi G.,State Key Laboratory for Disaster Prevention in Civil Engineering | Wang M.,Tsinghua University | Bai Y.,Monash University | And 3 more authors.
Engineering Structures | Year: 2012

In order to study cyclic performance of high-strength structural steel and establish an appropriate constitutive relationship, experiments were carried out on seventeen Q460D steel specimens subjected to different loading patterns. The mechanical responses of high-strength structural steel were evaluated and discussed including stress-strain relationship, failure modes, ductility and hysteretic performance. A constitutive model was further established for uniaxial cyclic loading and implemented in ABAQUS through its user subroutine interface - UMAT. After justification of the modeling results by the experimental measurements from various loading conditions, the proposed model was applied in nonlinear time history analysis for steel frames using fiber beam element method. Both experimental and modeling results showed that the responses of high-strength structural steel under cyclic loading and monotonic loading were different and the necking and fracture behavior would occur in advance for the former because the accumulated damages reduced the ductility of steel. © 2011 Elsevier Ltd.

Zhao B.-D.,Tongji University | Wang W.,State Key Laboratory for Disaster Prevention in Civil Engineering | Chen Y.-Y.,State Key Laboratory for Disaster Prevention in Civil Engineering | Meng X.-D.,Tongji University | And 2 more authors.
Xi'an Jianzhu Keji Daxue Xuebao/Journal of Xi'an University of Architecture and Technology | Year: 2010

The box-section beams of roof system of Shanghai Synchrotron Radiation Facility welded inner-stiffened tubular which filled concrete and inserted the reinforced concrete frame column. It forms a connection of concrete filled steel tubular column to box-section beam(CFTCBB). In this paper, a large-scale specimen of CFTCBB joint under static loading experiment is carried out and mechanical behaviors and failure patterns of the joint are studied. It is found that the failure patterns of the joint are elasto-plastic local buckling at the end of beam section and the beam can bear although local buckling is severe. The joint behaves excellently in deformability, and it also can develop a higher capacity than those of the members. Nonlinear finite element analysis shows that the simplified finite element model of cantilever beam simulate mechanical behaviors of counterpart in CFTCBB joint well. It also shows that the bearing capacity of beam will be enhanced if beam is arranged by an oblique angle and the shape of its support end is a straight line.

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