基于OpenSEES的预应力装配双肢墙低周往复试验数值分析

Numerical Analysis for Low-cyclic Loading Test of Post-tensioned Coupled Wall Based on OpenSEES

提出新型预应力装配双肢墙(PCW)结构并进行两榀PCW试件的低周往复试验与数值模拟。以有限元软件OpenSEES为分析平台,采用基于纤维模型并考虑剪切变形的非线性梁柱单元模拟墙肢,在连梁与墙肢结合部位采用零长度连接单元模拟预应力筋与连接钢筋的作用,编制程序求解零长度单元恢复力模型,采用自适应非线性求解法对两榀试件的低周往复试验进行数值分析,试验及数值分析结果表明:PCW结构具有良好的自恢复能力,卸载后残余变形小,结构损伤集中,震后易修复;连接钢筋的应用有效增大PCW结构的耗能能力;数值分析较好地模拟了PCW的弹塑性性能,数值分析结果与试验结果吻合良好,基于OpenSEES的分析模型适用于PCW结构的非线性分析。

A new kind of post-tensioned coupled wall(PCW) structure was proposed.The low-cyclic loading tests of the two PCW specimens were carried out.Based on OpenSEES,nonlinear beam-column element based on fiber model with the consideration of nonlinear shear deformation was used to simulate pier.The zero-length element was used to simulate the action of post-tensioned steel and connecting reinforcement in the interface between coupling beam and pier.The restoring force models of the zero-length elements were established by programming.The nu-merical analysis of the low-cyclic loading tests was performed using adaptive nonlinear solution.Results of the tests and the numerical analysis indicated that PCW is of good self-centering ability with little residual deformation after unloading,and damage concentrating in certain parts that can be repaired after the earthquake.The energy dissipa-tion capacity of PCW is increased because of the connecting reinforcement.The elastoplastic performances of PCW can be well simulated by numerical analysis,and the analysis model based on OpenSEES can be applied to non-lin-ear analysis with good precision.