同球向双球面减隔震支座关键部件力学参数影响因素分析

Influencing Factors on Mechanical Parameters for Key Components of a Double-Spherical Surface Seismic Isolation Bearing with the Same Spherical Direction

摘要:

以同球向双球面减隔震支座中的剪力销与减震榫耗能器为研究对象，针对减隔震支座剪力销和减震榫力学参数的影响因素及其规律进行研究。通过反应谱分析和有限元数值模拟的方法讨论了墩高和场地类型变化对剪力销剪断力的影响和减震榫几何参数对减震榫力学性能的影响，同时分析了减震榫在屈服荷载和极限荷载作用下的应力应变分布情况。结果表明，支座剪力销剪断力受墩高和场地条件的影响较大，不能简单地取支座竖向力与某一百分数的乘积设置剪力销的剪断力；减震榫的力学性能主要受d₀、L₁和L3个几何参数控制，本文给出的几何参数对减震榫力学性能的影响规律为减震榫力学参数的初步设置提供了参考。

Abstract:

In this paper, the shear pin and shock absorber of a double-spherical surface seismic isolation bearing with the same spherical directions were examined. Both influencing factors and rules of shear pin and shock absorber mechanical parameters of the bearing were studied. Using the response spectrum analysis method, effect on the shearing force of the shear pin is discussed by varying pier height and site category. In addition, the influence of geometric parameters on the mechanical properties of the shock absorber are discussed by FEM analysis. Stress and strain distribution of the shock absorber subjected to yield load and ultimate load were also analyzed. Results showed that the shearing force of the shear pin was greatly influenced by pier height and site category. Mechanical properties of the shock absorber were mainly controlled by three geometric parameters, d₀, L₁, and L. The influence law of geometric parameters on the mechanical properties of the shock absorber described in this paper can provide a reference for the preliminary setting of the mechanical parameters of the shock absorber.