深水大直径桥墩水下振动台试验研究  

Underwater Shaking Table Test of Deep-Water Large-Diameter Pier

作　　者：王磊[1] 吕忠达[1] 王飞[1] 赵卓[1] WANG Lei;LYU Zhongda;WANG Fei;ZHAO Zhuo(Engineering Research Center of Industrial Construction in Civil Engineering of Zhejiang Province,Ningbo University of Technology,Ningbo 315211,China)

机构地区：[1]宁波工程学院浙江省土木工程工业化建造工程技术研究中心,浙江宁波315211

出　　处：《桥梁建设》2025年第1期110-116,共7页Bridge Construction

基　　金：国家自然科学基金项目(11390361);宁波市科技创新2025重大专项(2019B10076)。

摘　　要：为研究水深和地震动特性对深水大直径桥墩动力响应和动水压力的影响,按1∶60缩尺比设计、制作1组桥墩模型进行水下振动台试验,研究不同水深及地震激励幅值下桥墩基频、动力响应和动水压力的变化规律。结果表明:随水深增大,桥墩基频呈加速下降趋势;桥墩应变、位移峰值和动水压力随水深增大而增大,且桥墩应变增幅呈加速增大趋势,相较无水工况,高水位时墩底应变增幅可达19.1%。深水桥墩应变和动水压力随地震激励幅值的增大呈线性增大趋势;动水压力与桥墩表面加速度成正比,可将动水压力表示成桥墩表面加速度与水体附加质量乘积形式,其中水体附加质量与输入地震波频谱特性相关。This study investigates the influence of water depth and ground motion characteristics on the dynamic response and hydrodynamic pressure of large-diameter bridge piers in deep water.A group of specimens with a 1∶60 scale were prepared for underwater shaking table tests,to analyze the variation of the fundamental frequency,dynamic response and hydrodynamic pressure of piers under different water depths and amplitudes of the ground motions.The results indicate that the fundamental frequency of the pier-bottom shows an accelerating downward trend as the water depth increases.Meanwhile,the peak strain,displacement and hydrodynamic pressure of the pier increases with the increased water depths,the growth rate of the pier strain reveals an accelerating trend.Compared with the waterless condition,the pier bottom strain can increase at a rate of 19.1%in high water level condition.The strain and hydrodynamic pressure of the deep-water pier increases linearly with the amplitude of the ground motions and the hydrodynamic pressure is directly proportional to the surface acceleration of the pier,therefore it is reasonable to regard the hydrodynamic pressure as the multiplication of the surface acceleration of the pier and the added mass of the water while the latter is related to the spectral characteristics of the input seismic waves.

关 键 词：深水大直径桥墩 水下振动台 墩-水耦合 基频 动力响应 动水压力 模型试验 

分 类 号：U443.22[建筑科学—桥梁与隧道工程] U442.39[交通运输工程—道路与铁道工程]