橡胶支座铅芯热效应评估方法

Evaluation Method for Heating Effect of Lead Core in Rubber Bearings

摘要:

为解决在铅芯热效应下橡胶支座温度场与力学性能退化预测的难点，提出了一种橡胶支座铅芯热效应评估方法，采用物理试验与数值模拟融合的技术路线，在物理空间研究自由边界与准真实边界下支座温度场传递规律及边界影响，在数值空间融合物理试验数据在真实边界条件下评估铅芯温度发展与支座力学性能退化。研究结果表明：试验显示，第一形状系数对支座升降温速率的影响显著；支座外侧橡胶保护层起到良好的隔热效果，致使支座自身降温缓慢；钢板-混凝土边界对支座温度场有较大影响不可忽视，应重视对支座边界的仿真模拟；数值模拟再现了物理试验过程，经试验验证分别实现了对支座与钢板-混凝土边界的合理仿真，最后在真实边界条件下实现对铅芯温度与支座力学性能退化规律的合理预测；所提方法可为不同参数特征的橡胶支座铅芯热效应评估提供借鉴。

Abstract:

To solve the research difficulties regarding the temperature field and mechanical properties degradation of lead rubber bearings under heating effects of the lead core， an evaluation method for heating effect of lead core was proposed by physical tests and numerical simulations. The law of temperature field transfer under free boundary and quasi-real boundary was studied in physical tests. The temperature variation of the lead core and mechanical degradation of bearings under heating effects were predicted by the numerical simulation under real boundary conditions. The results show that the influence of the first shape factor on the heating and cooling rate was significant. The insulation effect of the covering layer was remarkable， resulting in a slow cooling rate. The boundary consisting of steel plate and concrete block has a great influence on the temperature field of the bearing， and emphasis should be placed on simulation of the boundary. The numerical simulation reproduces the physical test process， and the simulation of the bearing and the steel-concrete boundary was experimentally verified. Finally， the temperature variation of the lead core and mechanical degradation of the bearing with the real boundary was predictable. The proposed method has strong applicability， which can provide a reference for evaluating heating effects of lead core in various types of rubber bearing.