方形钢管混凝土叠合柱三面受火后偏压力学性能研究  

Study on the mechanical properties of square Steel Tube-Reinforced Concrete(ST-RC)columns under eccentric compression after three-sides heating

作　　者：唐冲 包延红 TANG Chong;BAO Yanhong(School of Civil Engineering,Qinghai University,Xining 810016,China)

机构地区：[1]青海大学土木工程学院,青海西宁810016

出　　处：《青海大学学报》2023年第4期62-69,共8页Journal of Qinghai University

基　　金：青海省科学技术厅项目(2019-ZJ-971Q)。

摘　　要：为研究方形钢管混凝土叠合柱三面受火后的偏压力学性能,合理选取材料本构关系,建立方形钢管混凝土叠合柱三面受火后力学数值模型,对构件三面受火后的破坏形态、承载力-位移曲线、轴力分布进行分析.参考实际工程常用范围,对影响方形钢管混凝土叠合柱三面受火后偏压极限承载力的主要因素进行参数分析.结果表明:方形钢管混凝土叠合柱三面受火后破坏形态为弯曲破坏;受火时间、截面尺寸、长细比、核心面积比、偏心率、截面配筋率对方形钢管混凝土叠合柱三面受火后的偏压极限承载力影响较大.In order to investigate the eccentric compression mechanical properties of square Steel Tube-Reinforced Concrete(ST-RC)columns under the conditions of three-sides heating,a numerical model is established after selecting the material constitutive relationship reasonably.The damage morphology,bearing capacity-displacement curve and axial force distribution of the components are analyzed under the conditions of three-sides heating.Referring to the application scope of practical engineering,parameter analysis is conducted on the main factors affecting the ultimate bearing capacity of square ST-RC columns under eccentric compression after three-sides heating.The results indicate that the damage morphology of square ST-RC columns after three-sides heating is bending damage.The effects of fire exposure time,section size,slenderness ratio,core area ratio,eccentricity ratio and section reinforcement ratio on the ultimate eccentric bearing capacity of square ST-RC columns are greater after three-sides heating.

关 键 词：方形钢管混凝土叠合柱 三面受火 数值模拟 极限承载力 参数分析 

分 类 号：TU398.9[建筑科学—结构工程]