太白路桥减隔震设计分析

为满足太白路桥的高烈度抗震要求,对该桥进行了减隔震设计分析。利用Midas/Civil软件对该桥进行了非线性时程分析,并对比了减隔震设计前后桥梁的地震响应。结果表明:安装粘滞阻尼器和E型钢支座后,桥梁固定墩的纵向和横向墩底弯矩和剪力都明显减小;桥梁纵向和横向梁端位移也明显减小;固定墩墩顶位移在纵向和横向也减小很多。采用本文提出的减隔震设计方案后,太白路桥能够满足所在地区的抗震要求,大大提高了桥梁结构在地震作用下的安全性。

Analysis of shock-isolation design for Taibailu bridge

In order to meet the high-intensity anti-seismic requirements of Taibai bridge,this paper studied the seismic isolation designs.Nonlinear time-history analyses were carried out by the Midas/Civil software and the seismic responses of the bridge before and after the seismic isolation design were compared.The results showed that vertical and horizontal pier bottom bending moments and shear forces of the fixed pier reduced significantly,the vertical and horizontal displacement of the bridge beam end also decreased,fixed pier top displacement in the vertical and horizontal direction reduced a lot after the viscous damper and E shaped steel bearings were installed.The seismic isolation design presented in this paper meets the seismic requirements of Taibai bridge region and the safety of the bridge structure under earthquake is greatly improved.