自锚式悬索桥纵向地震响应控制分析

以某双塔自锚式悬索桥为例，通过在桥塔与主梁之间设置液体黏滞阻尼器，把地震作用下桥梁纵向的位移和内力控制在一个合理的范围内。通过改变阻尼参数C和α，对此桥纵向的地震位移和内力的变化情况进行了规律总结。比较发现，当阻尼系数C越大或阻尼指数α越小时，此桥纵向的地震位移和内力反应就越小。其中C取3500左右，α取0．3时，塔底地震弯矩降幅达40％左右，主梁地震位移降幅达50％左右。

Analysis of Longitudinal Seismic Reaction Control for Self-anchored Suspension Bridge

This paper takes a self-anchored suspension bridge with two pylons for example .Fluid viscous dampers which are installed between pylon and beam are introduced to balance the displacements and forces un -der earthquake in a reasonable range .The variation trend of the seismic displacements and forces are summa-rized by changing dampers ’ parameters C andα.By contrast , it is found that with bigger damper coefficient or smaller damper exponent , smaller bridge seismic displacements and forces are observed .When takes around 3 500 and takes 0.3, the seismic moments of pylon ’ s bottom decrease about 40%and the seismic displacements of beam decrease about 50%.