反复荷载作用下矩形钢管混凝土树状节点的非线性分析

本文在确定了往复应力作用下钢管混凝土的钢材和核心混凝土的应力-应变关系的基础上，利用纤维杆元模型，有限元模型对钢管混凝土Y形柱和十字形钢梁连接的节点的荷载-位移滞回关系曲线及其骨架曲线进行了计算，并与试验结果进行了比较。结果表明：由纤维杆元模型与试验所得的低周反复荷载作用下的骨架曲线极为相似，但在峰值荷载后差异较大；由纤维杆元模型和有限元所得的在低周反复荷载作用下滞回曲线也与在反复荷载作用下试验所得的结果相一致。纤维杆元模型能准确地预测节点的弹塑性行为和整体抗震性能，可用于节点滞回性能的非线性参数分析研究。在此基础上研究了方钢管混凝土柱的轴压比，宽厚比及核心混凝土强度对节点受力性能的影响。

Nonlinear analysis of dendriform connections to concrete filled square steel rectangular tubes under low-cycle reversed loading

In this paper,the load-displacement and skeleton curve of dendriform connections to the concrete filled square steel rectangular tubes under low-cycle reversed loading was calculated by fiber line element model,which is based on the relation of the stress-strain of steel and concrete and is compared with the FE and experiment.It is demonstrated that the monotonic load-displacement curves from the fiber line element models agree well with the framework curves of the cyclic behavior from the low-cycle reverse...