Constitutive relations and failure criterion for rectangular concrete-filled steel tube members under pure bending
Yang Lufeng1,2 Xie Weiwei1,2 Rong Yan1,2 Jiang Lifang1,2
1. Guangxi Key Lab of Disaster Prevention and Engineering Safety, Guangxi University, Nanning 530004, China;
2. Key Lab of Engineering Disaster Prevention and Structural Safety of China Ministry of Education, Guangxi University, Nanning 530004, China
Abstract：In order to evaluate the ultimate bearing capacity of rectangular concrete-filled steel tube (CFST) members under pure bending, the modified constitutive relations were proposed for steel tube and core concrete, and the bearing capacity failure criterion was developed. Firstly, by taking into account the favorable biaxial tensile state of the steel tube in tension zone and the unfavorable biaxial compressive-tensile state of the steel tube in compression zone, the modified constitutive relations were developed for steel tube. Then, the test database of short rectangular CFST members under axial compression was adopted to obtain the peak stress expression by means of regression analysis, and the modified constitutive relation of core concrete was presented. Moreover, taking into consideration the strain hardening of steel in tension zone, the bearing capacity failure criterion was defined based on the limit state of ultimate loading capacity. Finally, the accuracy and applicability of different constitutive relations and failure criterions were verified by means of the test database and the fiber model method. Results show that the proposed constitutive relations and failure criterion can lead to higher accuracy with wide range of application for the bending capacity of rectangular CFST members under pure bending.
杨绿峰 解威威 戎 艳 蒋莉芳. 矩形钢管混凝土受弯构件材料本构关系与失效判据研究[J]. 土木工程学报, 2019, 52(1): 60-70.
Yang Lufeng Xie Weiwei Rong Yan Jiang Lifang. Constitutive relations and failure criterion for rectangular concrete-filled steel tube members under pure bending. 土木工程学报, 2019, 52(1): 60-70.
