循环加载条件下钢管混凝土应力-应变关系模型

Constitutive model of concrete filled circular steel tube brace members under cyclic load

为建立钢管混凝土框—撑体系中钢管混凝土支撑的恢复力模型,分析循环加载条件下材料应力-应变关系模型,给出钢材应力-应变关系模型及受约束和非约束时混凝土的骨架曲线,并确立混凝土的加、卸载滞回规则,为开展低周往复荷载作用下钢管混凝土支撑在大变形状态下的恢复力特性研究提供参考依据.

In order to establish the restoring force model of steel concrete brace in concrete filled steel tube frame-support system,this paper studied materials constitutive relationship model under cyclic load,given the steel constitutive model and the confined and non-confined concrete skeleton curve,and established the loading and unloading hysteretic rules for concrete.These provide references for carrying out study on restoring force characteristics of concrete filled steel tube brace system in the large deformation under low cyclic load.