跨海桥梁大尺寸承台波浪力数值模拟研究  

Numerical simulation study of wave load on large-size cap of cross-sea bridge

作　　者：董伟良 诸裕良[2] 胡金春[1] 邵杰[1,2] DONG Wei-liang;ZHU Yu-liang;HU Jin-chun;SHAO Jie(Zhejiang Institute of Hydraulics & Estuary,Zhejiang Provincial Key Laboratory of Estuary and Coast,Hangzhou 310020,China;College of Harbour,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]浙江省水利河口研究院,浙江省河口海岸重点实验室,杭州310020 [2]河海大学港口海岸与近海工程学院,南京210098

出　　处：《水道港口》2020年第1期50-57,共8页Journal of Waterway and Harbor

基　　金：浙江省自然科学基金项目(LQ16E090004);浙江省科技计划项目(2018F10026);浙江省水利河口研究院院长基金(水工A17005)。

摘　　要：随着跨海桥梁深水化,桥墩尺寸和波浪荷载不断增加。为提高跨海桥梁安全性,通过Fluent软件建立了三维数值波浪水槽,进行了波浪作用大尺寸承台的数值模拟,分析了波高、淹没系数、周期以及承台长度对承台波浪力的影响。研究结果表明:在文章计算范围内,承台波浪力和波高基本呈线性变化关系。随着淹没系数Cs增大,承台水平力先增加后减小,而承台垂向力先减小后增加再减小。承台相对水平力fx随承台相对长度kb先增后减,当kb=1.3左右时相对水平力达到最大。承台相对垂向力fz随kb变化关系受承台淹没系数Cs影响:当Cs<1时,承台相对垂向力fz随kb增加逐渐减小,其中当kb趋近于0时fz=Kp,当kb趋近于+∞时fz=0;当Cs>1时,承台相对垂向力fz随kb增加先增后减,其中当kb趋近于0和+∞时fx均趋近于0。With the increase of water depth,the size of pier and the wave load on the cross-sea bridge continue to increase.In order to improve the safety of the cross-sea bridge,three-dimensional numerical wave flume models were established by Fluent software.A research was made to analyze the influence factors for wave forces on large-size cap including wave height,period,submerged depth and cap size.The result shows that the higher wave height is,the larger wave load acts on the cap.As the submerge coefficient Cs increases,the horizontal force on the cap increases first and then decreases,while the vertical force on the cap decreases first and then increases and finally decreases.The relative horizontal force fx of the cap increases first and then decreases with the increase of relative length kb,and reaches maximum when kb=1.3.The relationship between relative vertical force fz of the cap and kb is affected by the submerge coefficient Cs,the relative vertical force fz of the cap decreases with the increase of relative length kb when Cs<1,fz=Kp when kb approaches zero and fz=0 when kb approaches positive infinity.However,the relative vertical force fz increases first and then decreases with the increase of kb when Cs>1,fz is nearly zero when kb approaches zero and positive infinity.

关 键 词：波浪力 大尺寸 承台 淹没系数 周期 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]