Study on the Eccentric Compression Performance of Stiffened Square CFST

2018 International Conference on Civil, Architecture and Disaster Prevention

土木建筑工程

Zheng, Xinzhi^1^2^3 ; Zhou, Zhixiang^1 ; Zheng, Shuang^4 ; Wang, Taotao^3

Research Station of Civil Engineering, Chongqing Jiaotong University, Chongqing

40074, China^1

Henan Engineering Laboratory of Ecological Architecture and Environment Construction, Henan Polytechnic University, Jiaozuo

454000, China^2

Institute of Bridge Detection and Reinforcement Technology, Huanghe Jiaotong University, Jiaozuo

454950, China^3

School of Civil Engineering, Zhengzhou Institute of Technology, Zhengzhou

450044, China^4

关键词: Compression bending;    Concrete filled steel tubular columns;    Confinement effects;    Diameter-to-thickness ratios;    Eccentric compression;    Rectangular section;    Solving procedure;    Width-to-thickness ratio;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/218/1/012051/pdf
DOI  :  10.1088/1755-1315/218/1/012051

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

Concrete-filled steel tubular columns (CFST) have high bearing capacity, high stiffness and good ductility. The columns with square or rectangular section are more suitable for compression bending than round. However, its lateral binding force is small in the middle of the section, and local buckling is easy to occur. Stiffened Square Concrete Filled Steel Tubular columns (SSCFST) are proposed to solve the problem that ordinary square concrete filled steel tubular columns(SCFST) are prone to appear local buckling before reaching the limits of carrying capacity in 3 cases such as the thinner steel tube wall, the larger diameter to thickness ratio or width to thickness ratio. SSCFST are SCFST added with stiffening ribs, stiffening hoops and binding bars. By its set, the lateral stiffness and the resistance ability of the local buckling of the steel tube are effectively enhanced, so the confinement effects of the steel tube to core concrete become stronger and more uniform. To compare the improved effects of SSCFST and SCFST with binding bars under eccentric compression, the paper compiles the solving procedure of the cross section grid unit method which can accurately solve the whole process curve of SSCFST under eccentric compression. The whole process curves show that the eccentric bearing capacity and ductility of SSCFST are obviously improved with respect to SCFST with binding bars.