深水桥梁双承台组合基础波浪力的参数影响性研究  

Study of Structural Parametric Influences on Wave Forces of Deepwater Bridge Combined Foundation of Twin Pile Caps

作　　者：刘逸敏[1] 李方锋 张效忠[1] 

机构地区：[1]上海大学土木工程系,上海200072 [2]中铁大桥局集团有限公司,湖北武汉430050

出　　处：《桥梁建设》2014年第1期37-43,共7页Bridge Construction

基　　金：国家自然科学基金(11072143);浙江省教育厅科研项目(Y201223039)~~

摘　　要：为研究组合基础中各构件波浪力的变化规律,以某深水桥梁采用的双承台组合基础为原型,采用特征函数展开匹配法计算承台波浪力,结合Morison公式计算桩柱波浪力,分析承台尺寸、浸深和桩柱位置等参数的变化对基础波浪力的影响。结果表明:下承台半径对上承台波浪力(力矩)影响较大,其高度的影响与上、下承台半径比有关;上承台尺寸主要影响下承台水平波浪力和波浪力矩;随上承台浸深的增加,下承台波浪力(力矩)曲线出现多个极值;中部桩柱波浪力随上承台浸深增加呈先增后减趋势;边部桩柱波浪力随桩心角的增大呈先增后减趋势、随桩心距的增大而增加,承台的存在引起波浪力偏向和相位差。To study the changing law of the wave forces of different components of combined foundation, the deepwater combined foundation of twin pile caps used for a bridge was taken as the prototype, the eigenfunction expansion match method was used to calculate the wave forces of the pile caps and with reference to the Morison formula, the wave forces of the pile cylinders were calculated and the influences of changing of the structural parameters like the pile cap di mensions, submerged depth and pile locations on the wave forces of the foundation were ana lyzed. The results of the analysis indicate that the influence of the radius of the lower pile cap on the wave forces （moment） of the upper pile cap is great. The influence of the height of the lower pile cap is related to the radii of the upper and lower pile caps. The dimensions of the upper pile cap mainly have influence on the horizontal wave force and wave moment of the lower pile cap. With the increase of the submerged depth of the upper pile cap, a number of extreme values ap pear in the curve diagram of the wave forces （moment） of the lower pile cap： The wave forces of the central pile cylinders present the tendency of increase first and then decrease with the increase of the submerged depth of the upper pile cap. The wave forces of the side pile cylinders present the tendency of increase first and then decrease with the increase of the pile center angles and will increase with the increase of the pile center distances. The existence of the pile caps causes the deflection and phase differences of the wave forCes.

关 键 词：桥梁工程 组合基础 双承台 数值计算 桩柱 波浪力 尺寸 浸深 

分 类 号：U443.1[建筑科学—桥梁与隧道工程]