考虑动水压力效应的高桩承台连续梁桥抗震性能评估  

Seismic Performance Evaluation of Continuous Girder Bridges with Elevated Pile Caps Considering the Effect of Dynamic Water Pressure

作　　者：李磊[1] 张永亮[1] 陈敦[1] 

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《水利与建筑工程学报》2015年第4期28-32,39,共6页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金资助项目(51468031)

摘　　要：以某深水高桩承台连续梁桥为工程背景,应用Morison方程将水对桥梁的动水压力效应按附加质量考虑,讨论了动水压力对桥梁动力特性的影响。依据2008年《公路桥梁抗震设计细则》的抗震要求,考虑动水压力效应,对该桥进行了E1、E2地震反应分析及抗震验算。分析结果表明:动水压力将明显改变高桩承台连续梁桥的动力特性;E1地震下,1#非水中墩(固定墩)和2#水中墩及桩基强度满足规范要求;考虑到损伤桩基修复困难,E2地震下对2#水中桩基的抗震性能进行了提高,经验算2#水中墩及桩基在E2地震下处于弹性状态;E2地震下,1#非水中墩(固定墩)纵桥向塑性铰区的变形能力、抗剪能力满足规范要求。Taking a continuous girder bridge with deep elevated pile caps as the engineering background, the dynamic water pressure on bridge foundation was considered as additional quality according to Morison equation, and the influence of dynamic water pressure on the dynamic characteristics of the bridge was discussed. Under El and E2 earthquake, the seismic response analysis and aseismic calculation were carried out based on the requirements of seismic resistance in the Guidelines for Seismic design of Highway Bridges（2008 Edition） with the consideration of dynamic water pressure. The analysis results indicate that： dynamic water pressure will significantly change the dynamic characteristics of the continu- ous girder bridge with elevated pile caps; under E1 earthquake, the strength of 1 # pier （fixed pier） out of water and 2# pier as well as piles foundation in water can meet the requirements of the guidelines; under E2 earthquake, considering difficult repair of the damaged piles, the seismic performance of 2 # piles foundation in water are improved, which are in the elastic state during the earthquake; under E2 earthquake, the longitudinal plastic hinge deformation capacity and shear capacity of 1 # pier out of water （fixed pier） can meet the requirements of the guidelines.

关 键 词：动水压力 高桩承台连续梁桥 时程分析 抗震评估 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]