三种减隔震装置对大跨度桥梁抗震性能的影响研究

Influence of Anti-seismic Property for Long-span Bridge with Three Kinds of Seismic Isolation Devices

结合具体工程案例对大跨度连续梁桥经常采用的钢阻尼减隔震支座、摩擦摆支座和速度锁定装置进行了地震反应计算,对比了三种减隔震装置对桥梁抗震性能的影响,结果表明:E1与E2地震作用下,设置速度锁定装置的桥梁各墩受力比较大;E2地震作用下钢阻尼减隔震支座和摩擦摆支座桥梁各墩受力较小,摩擦摆支座和钢阻尼减隔震支座减隔震效果较好;E2地震作用下设置速度锁定装置的桥梁墩顶位移较大;大跨度桥梁减隔震设计时,建议优先考虑摩擦摆和钢阻尼减隔震支座。

The steel damping isolation bearing, friction pendulum bearing and speed lock-up device are often used in long- span continuous girder bridges. Based on practical engineering, the effect of three kinds of seismic isolation devices on anti- seismic property of the bridges was compared by calculation of earthquake responses. The results showed that, under the E1 and E2 earthquake action, the pier forces of the bridges with speed lock-up devices were larger than the bridge with steel damping isolation bearing and friction pendulum bearing. Under the E2 earthquake action, the pier forces of the bridges with steel damping isolation bearing and friction pendulum bearing were smaller, and the seismic isolation effieieneies were better. Under the E2 earthquake action, the pier displacements of the bridges with the lock-up devices were relatively lar- ger. When long-span bridges were designed by the seismic dissipation and isolation, the steel damping isolation bearing and friction pendulum bearing should be considered firstly.