方形截面深水桥墩的地震响应分析方法研究  

Study of Seismic Response Analysis Methods for Square Section Deepwater Bridge Piers

作　　者：向宝山[1] 祝兵[1] 段伦良 蔡子龙[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《桥梁建设》2017年第3期59-64,共6页Bridge Construction

基　　金：国家自然科学基金项目(51178397)~~

摘　　要：为验证地震响应分析方法对方形截面深水桥墩的适用性,以边长为2m、高度为60m的正方形截面桥墩为例,分别采用解析法、数值法、结合法分析其在不同水深情况下的墩顶位移和墩底应力,并在此基础上对比方形截面和圆形截面桥墩地震响应的特点。结果表明:采用解析法按刚体运动计算方形截面桥墩的地震响应时,一定程度上夸大了动水压力的影响;采用数值法按弹性振动计算方形截面桥墩的地震响应时,水深增加的作用效果恰好与按刚体运动计算时相反,减小了桥墩的地震响应;采用结合法同时考虑地震作用下桥墩的刚体位移和弹性振动时,计算方形截面桥墩的地震响应更合理;方形截面桥墩与圆形截面桥墩的地震响应随水深的变化趋势类似。To check up the applicability of the different seismic response analysis methods to the square section deepwater bridge piers, a bridge pier of the same kind with side length of 2 m and height of 60 m was taken as an example, the displacement at the top and the stresses in the footing of the pier under the different water depth were analyzed, respectively using the analytical method, numerical method and the combination method and on the basis of the analysis, the seis-mic response characteristics of the square and circular section bridge piers were compared. The re-sults of the analysis suggest that when the seismic response of the square section bridge pier is cal-culated according to the rigid motion, using the analytical method, the calculation exaggerates the influence of the hydrodynamic pressure to some extent. When the seismic response is calculated ac-cording to the elastic vibration, using the numerical method, the effect of the increased water depth action is just on the contrary to that in the calculation according to the rigid motion and the seismic response is substantially reduced. When the seismic response is calculated, using the com-bination method and at the same time, the rigid displacement and elastic vibration of the pier underthe seismic action are considered, the calculation of the seismic response is more reasonable. The tendencies of the seismic responses of the square and circular section bridge piers changing with the water depth are similar.

关 键 词：深水桥墩 方形截面 墩-水耦合 解析法 数值法 结合法 地震响应 抗震分析 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]