装配式短肢剪力墙节点抗震性能参数分析及恢复力模型研究

Parametric analysis of seismic performance of assembled short leg shear wall joints and modeling the restoring force

采用ANSYS建立装配式短肢剪力墙的节点模型,分析得到节点在低周反复荷载作用下的滞回曲线和骨架曲线,验证装配式短肢剪力墙节点能够满足“等同现浇”的抗震性能目标;结合3个试件的实测数据,拓展26个试件的数值模拟分析,并对肢厚比,轴压比,剪跨比,混凝土强度,墙肢纵筋配筋率,墙肢箍筋配筋率,连梁纵筋配筋率和连梁纵筋配筋率的重要影响参数进行扩展分析,确定恢复力模型的主要影响因素,对下降段刚度与延性系数回归分析建立相关公式。在此基础上对骨架曲线进行无量纲化处理,建立统一骨架曲线和考虑卸载刚度与再加载刚度的滞回模型,并且与计算结果进行对比,对比发现与计算结果吻合较好。建立的恢复力模型可以为装配式短肢结构弹塑性地震反应分析时作为参考。

The ANSYS®software program was used to establish the joint model of the short-leg shear wall,and the hysteretic curves and skeleton curves of short-leg shear wall joints under low cyclic loading were calculated.It was verified that the short-leg shear wall joints can meet the seismic performance target equivalent to that of cast-in-place ones.In combination with the measured data of three specimens,the numerical simulation analysis of 26 specimens was extended.The important influencing parameters such as limb thickness ratio,axial compression ratio,shear span ratio,concrete strength,longitudinal reinforcement ratio,stirrup ratio,longitudinal reinforcement ratio of coupling beam,and longitudinal reinforcement ratio of coupling beam were extensively analyzed to determine the main influencing factors of the restoring force model,and the regression analysis of stiffness and ductility coefficient of descending section was performed to establish related formulas.On this basis,the skeleton curve was treated to be dimensionless,and the unified skeleton curve and the hysteretic model accounting for the unloading and reloading stiffness terms were established.Through comparison,it was found that the restoring force model can be used as a reference for the elasto-plastic seismic response analysis of assembled short-leg structures.