基于辐射波浪理论的圆形桥墩动水压力表达式的简化研究  

Simplified Hydrodynamic Pressure Expressions of Circular Piers Based on Radiation Wave Theory

作　　者：杨万理[1,2] 李乔[1,2] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]抗震工程技术四川省重点实验室,四川成都610031

出　　处：《公路交通科技》2012年第7期45-51,57,共8页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51078317;51108383);交通运输部西部交通建设科技项目(200831800098)

摘　　要：为了解决基于辐射波浪理论的圆形桥墩外域水动水压力表达式极其繁冗、难以计算的问题,对动水压力的影响要素如自由表面波、附加阻尼、附加质量进行了研究,通过数学分析、曲线拟合的方法提出了圆形桥墩外域水动水压力的简化表达式。研究结果表明:自由表面波对附加质量、附加阻尼的影响很小,附加阻尼本身也很小,可不考虑自由表面波以及附加阻尼的影响;刚体运动附加质量近似等于弹性振动附加质量,可用易于计算的刚体运动附加质量替代难以计算的弹性振动附加质量。实际深水桥梁在不同地震波作用下的地震响应计算结果表明,简化表达式具有很高的精度和计算效率。The expressions of hydrodynamic pressure of circular piers caused by outer water based on the radiation wave theory are too complicated to be applied in practice, hence it is necessary to make simplification. The influencing factors of hydrodynamic pressure such as free-surface wave, added damping and added mass were studied, and the simplified expressions were then proposed by the ways of mathematical analysis and curve fitting. The results show that （ 1 ） free-surface wave has little effect on added mass and added damping, as added damping itself is a small one, so both of added clamping and free-surface wave can be ignored; （2） added mass caused by rigid motion almost has the same value as the one caused by elastic vibration, so the latter can be substituted by the former which is easier to be calculated. The calculation results of practical deep-water piers under different kinds of seismic wave show that the simplified expressions are efficient and exact enough for practical application.

关 键 词：桥梁工程 圆形桥墩 曲线拟合 动水压力 流固耦合 辐射波浪理论 

分 类 号：U441.3[建筑科学—桥梁与隧道工程] TU311.3[交通运输工程—道路与铁道工程]