深水空心桥墩地震动水附加质量计算方法比较研究  

Comparative Study of Hydrodynamic Added Mass Calculation Method for Deepwater Hollow Pier

作　　者：高立宝 张家瑞 魏凯[2] 徐章洁 GAO Li-bao;ZHANG Jia-rui;WEI Kai;XU Zhang-jie(Powerchina Chengdu Engineering Corporation Limited. Chengdu 610072,China;Department of Bridge Engineering,School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中国电建集团成都勘测设计研究院有限公司,成都市610072 [2]西南交通大学土木工程学院桥梁工程系,成都市610031

出　　处：《公路》2019年第7期98-103,共6页Highway

基　　金：国家自然科学基金项目,项目编号51708455

摘　　要：为对比研究不同规范对深水空心桥墩的地震动水附加质量计算方法,以一个深水空心矩形桥墩为例,建立基于势流体单元的流固耦合数值模型和基于规范方法的附加质量模型。以流固耦合模型的结果为参照,对比分析了我国铁路规范、日本规范、欧洲规范附加质量方法在桥墩自振频率、地震响应计算上的精度。研究表明,水的存在会降低深水桥墩的自振频率,增大墩底和墩顶的地震响应,动水效应随水深增加逐渐增大;对于深水桥墩的一阶自振频率,欧洲规范的结果偏大,日本规范的结果偏小,我国铁路规范与流固耦合模型结果较接近;对于地震响应,当水深较小时,三种规范的结果差异较小,当水深较大时,三种规范的结果差异较大,其中欧洲规范的误差最小。In order to compare the added mass calculation method in different design codes for deepwater hollow piers,a typical deepwater hollow rectangular pier is taken as an example.The fluidstructure interaction(FSI)model using potential-based fluid elements and added mass model according to design codes are established.The results of the natural frequency and the seismic responses calculated according to Chinese railway code,Japanese code and Eurocode 8 are compared with the fluid-structure interaction model.The study shows that:(1)the existence of water reduces the natural frequency of the deepwater pier and increases the seismic responses at both the bottom and top of the pier,and the hydrodynamic effect increases with water depth;(2)for the first order natural frequency,the results of the Eurocode 8 and Japanese code are greater and less than those of the FSI model,respectively,while the results of the Chinese railway code are comparable with those of the FSI model;and(3)for the seismic responses,the difference among the three codes is small under shallow water while the results of the three codes are quite different from each other and the error of the Eurocode 8 is the smallest under deep water.

关 键 词：深水空心桥墩 动水附加质量 设计规范 流固耦合 比较研究 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]