型钢混凝土柱基于OpenSEES平台的滞回性能分析

为研究型钢混凝土柱在低周反复荷载作用下的抗震性能,采用开源的有限元分析软件OpenSEES,建立基于纤维模型的型钢混凝土柱模型,通过定义不同单轴材料本构关系的纤维来模拟其各自不同的应力-应变关系,结合非线性梁柱单元,形成完整的型钢混凝土柱模型,并采用此模型对低周反复荷载作用下4个不同轴压比的型钢混凝土柱进行滞回性能的全过程数值模拟.研究结果表明;型钢混凝土柱具有较好的抗震性能,但在高轴压比下,耗能能力和延性下降剧烈.

Analysis on Hysteretic Characteristics of Steel Reinforced Concrete Columns on OpenSEES

In order to study the seismic behavior of SRC （Steel Reinforced Concrete） column under low-cycle loading, the open source finite element software OpenSEES was used to establish models of SRC columns based on the nonlinear beam-column element. Different fibers were defined to simulate different stress-train relationships. And then, the model was used to simulate the hysteretic behavior of SRC columns with different axial compression ratio under low-cycle loads. The results show that SRC columns behave good seismic prop- erties with different axial load ratios, but the energy dissipation and ductility decreased seriously.