RESEARCH ON RESTORING FORCE MODEL OF HIGH STRENGTH CONCRETE-FILLED SQUARE STEEL TUBULAR COLUMNS
Based on the experimental results of twenty three high strength concrete-filled square steel tubular (HCFT) columns subjected to cyclic lateral load, the restoring force model of square HCFT columns is established. Through theoretical analysis and experimental results, the main parameters of the restoring force model which are axial load ratio, confinement effect coefficient as well as slenderness ratio are discussed. The theoretical method is put forward. The results show that the relation of elastic stiffness to degraded stiffness, the relation of ultimate bearing capacity to yielding loads are proportional with confinement effect coefficient, and inversely with axial load ratio as well as slenderness ratio. Many various influential factors are considered in the restoring force model of square HCFT columns. The model is close to the experimental results which can be conveniently applied for nonlinear dynamics analysis of composite structures.
high strength concrete-filled rectangular steel tubular columns restoring force model azial load ratios confinement effect coefficient slenderness ratio
Kai-Ze Ma Xin-Wen Liang Bin Li
School of Civil Eng., Xian University of Architecture and Technology, Xian 710055, P.R. China Architectural Engineering Institute, Inner Mongolia Scientific and Technical University, Baotou 0140
国际会议
广州
英文
647-652
2009-11-28（万方平台首次上网日期，不代表论文的发表时间）