摘要
在多跨长联连续梁桥的抗震设计中,固定墩在强震作用下需要承担上部梁体绝大部分的惯性力,固定墩需要较大的设计截面及较多的配筋,而活动墩的强度未能得到有效的利用。针对这一情况,文章结合渑垣高速黄河特大桥,通过对比设置不同固定墩情况下的结构地震响应,确定合理抗震结构体系。采用结构有限元分析软件Midas Civil建立主桥有限元模型,对比应用速度锁定装置前后结构的地震响应。分析结果表明,速度锁定装置可使活动墩参与顺桥向地震荷载分配,有效降低了固定墩的地震响应,使得主墩受力更加均匀,明显提高了结构整体抗震能力。
In seismic design of long multi-span continuous girder bridge,the fixed pier bears most of beam inertial force in earthquake. Therefore, the fixed pier must be designed with lager section and higher reinforcement ratio, and the strength of free piers are used wastefully. Based on Mianyuan Yellow river bridge, the reasonable seismic structural system is determined by comparing the structure response with different numbers of fixed piers. The structure analysis software Midas Civil is used to establish finite element model of the main bridge, then the structure responses are compared before and after the LUPs being applied. Research results show that LUPs can make free piers participate longitudinal earthquake load distribution, reduce the fixed piers earthquake forces, make the main piers forces more balanced, and improve seismic capacity of the structure significantly.
出处
《现代交通技术》
2017年第5期27-29,41,共4页
Modern Transportation Technology
关键词
桥梁工程
地震响应
减震分析
非线性时程分析
速度锁定装置
bridge engineering
seismic response
sseismic isolation analysis
nonlinear time-history analysis
lock-up device
