多铅芯橡胶隔震支座非线性力学性能试验研究及其显式有限元分析

EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES OF MULTI-LEAD RUBBER BEARING AND ITS EXPLICIT FINITE ELEMENT ANALYSIS

对应用于桥梁隔震的多铅芯橡胶支座进行非线性力学性能试验,并与理论计算结果进行对比分析。研究表明:多铅芯橡胶隔震支座性能稳定、受力性能良好、安装方便,是一种理想的桥梁隔震装置。在此基础上,采用显式有限元分析软件ANSYS/LS-DYNA分析多铅芯橡胶支座的非线性动态特性,建立铅芯橡胶支座的FEA(有限元)模型,针对支座中心加竖向荷载和水平向循环往复位移荷载,进行了数值模拟分析,其结果与试验曲线基本吻合,从而为确定多铅芯橡胶支座的动力分析参数提供计算方法,进而可为设计新型铅芯橡胶支座提供指导。

The mechanical property tests on multi-lead rubber bearings were conducted, the results were compared with theoretical calculation consequence. It is found that performance of multi-lead rubber bearings are steady, also with excellent working performance, convenience installation. They are ideal bridge isolated devices. Based on the study, the analysis of the nonlinear dynamic characteristics of multi-lead rubber bearings by using explicit finite element software ANSYS/LS-DYNA is presented. After create FEA model of representative samples, the lead-rubber bearing in a horizontal cyclic shear under a compressive axial load is simulated. The analytical results are compared with experimental results, and small difference is found. Thus, the proposed method can be applied to acquire the mechanical parameters of bearings, which are useful in design new bearings.