考虑风浪流作用下的深水桥墩动力响应分析  

Dynamic Response Analysis of Deep-water Pier under Effect of Wind Flow

作　　者：王子健[1,2] 武黎明[3] 肖盛燮[2] 

机构地区：[1]重庆科技学院建筑工程学院,重庆401331 [2]重庆交通大学土木建筑学院,重庆400074 [3]重庆工商职业学院建筑工程学院,重庆400052

出　　处：《科学技术与工程》2014年第19期293-297,共5页Science Technology and Engineering

基　　金：国家自然科学基金项目(50879097)资助

摘　　要：考虑到跨江跨海大桥桥墩经常受到的是风浪流的共同耦合作用,在进行江海的深水桥墩结构设计时,除了波浪荷载作用之外,还需考虑风浪流环境荷载的影响是必不可少的。基于此,本文在流固耦合研究成果和流体理论基础上,考虑附加质量和流固耦合效应的同时,运用ANSYS有限元软件的流固耦合模块计算深水桥墩在流速及风荷载影响下的响应,并利用数值编程工具MATLB对不同工况下的桥墩响应结果进行分析比较。结果表明:当激励荷载为风浪流时,输入风、浪及流的频谱特性以及风、流的速度都将对深水桥墩结构的动力响应产生不同程度的影响。因此在深水桥墩结构设计时,应该针对待建桥梁所处的地理水文条件,合理的选择环境荷载进行设计计算,以提高结构的安全度。Considering that piers of river-crossing and sea-spanning bridges are often coupling affected by wind flow,not only load effect of wave but also influences of environmental load of wind flow should be essentially taken into account in the structural design of deep-water piers in seas and rivers.On the basis of this,additional mass and fluid-solid coupling effect was considered based on research achievements of fluid-solid coupling and fluid theory.Meanwhile the fluid-solid coupling module of ANSYS finite element soflware was used to calculate response of deep-water pier under the influences of flow velocity and wind load and the numerical programming tool MATLB was used to do analysis and comparison on piers＇ response results under different working conditions.Results present that the inputs of spectral characteristics of wind,wave and flow and speeds of wind and flow produce different degrees of influences on dynamic response of deep-water pier structure when excitation load is wind flow.Therefore geographical hydrology conditions of bridges to be built should be payed attention in structural design of deep-water pier for reasonably choosing environmental load to do design and calculation so that safety degree of structure could be improved.

关 键 词：深水桥墩 动力响应 风浪流 对比分析 

分 类 号：TV139.2[水利工程—水力学及河流动力学] P512.2[天文地球—地质学]