不同水深情况下水中桥墩地震响应研究  

Seismic response analysis of bridge pier in water by different water depth

作　　者：刘保东[1] 李鹏飞[1] 高超[1] 

机构地区：[1]北京交通大学,北京100044

出　　处：《土木工程学报》2010年第S2期199-203,共5页China Civil Engineering Journal

基　　金：科技部"国家攻关"项目(2006BAJ06B04)

摘　　要：基于含水率对混凝土材料性能影响的试验,采用Morsion方程,针对不同水深情况,利用有限元模型,计算分析含水率与动水压力对深水桥墩地震响应的影响程度。研究表明:动水压力增大了桥墩地震响应,随着水深的增大,影响程度在增加;综合考虑动水压力和含水率影响后,墩底内力的变化趋势与只考虑动水压力影响时相同,而墩顶位移变化程度呈现先减小再增大的趋势;相对水深更能体现动水压力对桥墩地震响应的影响程度,建议采用相对水深来决定在抗震设计中是否考虑地震动水压力对桥墩的影响。Based on the experimental relationship between moisture content and properties of concrete material,and the Morsion equation for the effect of hydrodynamic water,a finite element analysis was applied in order to investigate the seismic response of bridge piers with different water depths.The results show that the hydrodynamic pressure promote the seismic response of bridge piers,and this promotion increases as the water depth increases.Compared with those under consideration of only the hydrodynamic pressure,the internal forces of pier bottom under consideration of both the hydrodynamic pressure and moisture content of concrete present same characteristics,however,the variation amplitude of displacements of pier cap present a trend(from increase to decrease).The results indicate that the relative water depths can provide a better correlation with the seismic responses of bridge piers,compared to the absolute water depths.Thus,the relative water depths are suggested as the criterion on whether the hydrodynamic pressure should be taken into account in the seismic response analysis of bridge piers.

关 键 词：混凝土桥墩 地震响应 含水率 动水压力 相对水深 

分 类 号：U443.22[建筑科学—桥梁与隧道工程] U441.3[交通运输工程—道路与铁道工程]