剪力键对摩擦摆式支座减隔震效果的影响

Effect of shear-key on seismic isolation effect of FPB

以粤东高烈度地区某连续梁桥为背景,提出ANSYS中对带剪力键的摩擦摆减隔震支座的数值模拟方法,通过建立全桥有限元模型,利用该数值模拟方法分析剪力键对摩擦摆支座减隔震效果的影响。通过改变摩擦摆支座的相关参数,研究参数变化对摩擦摆支座减隔震效果的影响。研究结果表明:在摩擦摆支座的摩擦因数较小且摩擦摆滑道曲率半径较大时,剪力键对采用摩擦摆支座的减隔震桥梁墩底弯矩影响较大,需要在地震反应分析时考虑剪力键的影响。

Taking a continuous beam bridge in the highly seismic region of the eastern Guangdong Province as an example, the numerical simulation method for the FPB with shear-key was put forward. Based on the full-bridge finite element model, the effect of shear-key on seismic isolation effect of FPB was analyzed by using the numerical simulation method. By changing relevant parameters of FPB, the influence of the shear-key with different parameters on the isolation of FPB was investigated. The results show that when the friction coefficient of FPB is small and the radius of curvature is large, the shear-key has a great influence on the bending moment of the pier base. It is necessary to consider the influence of the shear-key in the seismic response analysis.