Homogenous generalized yield function and ultimate load-bearing capacity analysis of rectangular concrete-filled steel tubular trusses
Yang Lufeng1,2 Jiang Lifang1,2 Zheng Jian1,2 Xie Weiwei1,2
1. School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;
2. Key Lab of Engineering Disaster Prevention and Structural Safety of the Ministry of Education, Guangxi University, Nanning 530004, China
Abstract：The homogeneous generalized yield function (HGYF) was developed for the concrete-filled steel tube (CFST) with different rectangular cross sections, and the elastic modulus reduction method (EMRM) was proposed for evaluating the ultimate bearing capacity of the CFST trusses. Firstly, high-order polynomials consistent with different rectangular cross sections were employed to develop the explicit expressions of the undetermined coefficients of HGYF, taking the constraint effect coefficients as arguments, so that the HGYF was developed for CFST components with rectangular sections. Then an adaptive criterion was presented to distinguish the highly-stressed elements. Secondly, the elastic modulus of the highly-stressed elements were reduced to simulate the stiffness damage, then the ultimate bearing capacity was determined for the CFST trusses. The computation results for CFST components and structures by the proposed method agree well with those from the model experiments and the incremental non-linear finite element method, which indicates that the HGYF and the EMRM have good applicability and accuracy with higher efficiency.
