塑性铰区埋入高阻尼隔震橡胶层厚度的数值模拟分析

Numerical simulation on the thickness of high damping rubber layer built in plastic hinge

钢筋混凝土(RC)桥墩一旦出现塑性铰后,混凝土的破坏主要集中在塑性铰区域,而且塑性铰区混凝土的损伤及破坏程度在较大程度上影响RC桥墩的抗震性能。本文希望通过在RC桥墩塑性铰区域埋入橡胶层来提高其变形能力、增强延性和耗能能力,改善传统RC桥墩的抗震性能。基于橡胶、混凝土和钢筋的本构模型及承载力—变形理论,采用条带法,本文提出了不同轴压比、不同层间位移角所需要橡胶层厚度的计算方法,并编制了计算程序;分析得到了不同轴压比、不同层间位移角的RC柱中所需埋入的橡胶层的最小厚度,为确定RC柱塑性铰区所埋入橡胶层厚度提供参考。

Generally,the damage of concrete is concentrated on the plastic hinge zone,once plastic hinge appears in reinforced concrete（RC） bridge pier.What＇s more,the damage condition of concrete has a large effect on the seismic performance of RC bridge pier.This paper aimed at developing a new type of RC bridge pier with a rubber layer built-in its plastic hinge zone,in which the deformation capacity,ductility and energy dissipation are increased.Based on the constitutive model of rubber material,concrete,steel and the theory of loading capacity-deformation,the calculation method used to estimate the thickness of rubber layer built in RC column with different axial load ratio and drift deformation was proposed in this paper,and a computing program was developed.The minimum thickness of high damping rubber built in RC column was presented with different axial load ratio and drift deformation,it can be used to calculate the thickness of rubber layer built in RC column.