考虑倾斜角度的T梁与箱梁极端波浪作用受力研究  

Research on the force of inclined T-girders and box girders under extreme wave loads

作　　者：邓年春[1] 张志豪 韦承勋 余松泽 李盛辉 DENG Nianchun;ZHANG Zhihao;WEI Chengxun;YU Songze;LI Shenghui(School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Sichuan Road and Bridge(Group)Co.,Ltd.,Chengdu 610041,China;School of Civil Engineering and Architectural,Guangxi University of Science and Technology,Liuzhou 545006,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]四川公路桥梁建设集团有限公司,四川成都610041 [3]广西科技大学土木建筑工程学院,广西柳州545006

出　　处：《海洋工程》2024年第5期106-118,共13页The Ocean Engineering

基　　金：广西科技基地和人才专项项目(桂科AD21075038);2020年度广西高校中青年教师科研基础能力提升项目(2020KY08024)。

摘　　要：近海桥梁所处海洋环境极为复杂,极易受到海啸及风暴潮等极端波浪灾害的威胁,倾斜的T形与箱形桥梁上部结构不同的截面形式在极端波浪作用下所受波浪力存在较大差异,应对其进一步研究比较并区别考虑。通过数值模拟方法以孤立波模拟海啸极端波浪,开展极端波浪对倾斜桥面结构影响的数值研究。首先对数值水槽中的波浪模拟效果及波浪力计算准确性进行验证,在此基础上,研究不同淹没深度、波高及桥面倾斜角度变化条件下T梁和箱梁所受波浪力特点,并比较两者受力差别。研究结果表明:总体上,波高越高两种主梁所受竖向力、水平力和弯矩越大;T梁与箱梁水平力峰值和竖向力峰值往往发生在负倾角范围;T梁与箱梁处于未淹没状态时受波浪砰击影响,所受波浪力主要由砰击力主导,T梁受梁肋间空区影响,发生多次砰击作用,箱梁发生单次砰击作用,主梁截面形式对主梁所受波浪力影响显著。半淹没情况下,在相同波高和倾角条件下T梁竖向力和水平力峰值均大于箱梁竖向力和水平力峰值,由负倾角所主导。全淹没情况下,主梁主要受极端波浪动水压力作用,T梁与箱梁空区被水体填满,两者腹板几何形状对竖向动水压力影响较小,而对水平力峰值有显著影响。The marine environment where coastal bridges are located is extremely complex and vulnerable to the threat of tsunami and storm surge disasters.The inclined T-shaped and box-shaped superstructures of bridges have different cross-sectional forms,and the wave forces acting on them under extreme wave conditions differ significantly,which requires further comparative study.Through numerical simulation using solitary waves to simulate tsunami-induced extreme waves,a numerical study on the effects of extreme waves on the tilted bridge deck structure is carried out.First,the accuracy of wave simulation and wave force calculation in the numerical wave flume is verified.Based on this,the characteristics of wave forces on T-girders and box girders under different submergence depths,wave heights,and bridge deck tilt angles are studied,and the differences in the forces on the two are compared.The results show that:Overall,the higher the wave height,the greater the vertical force,horizontal force,and moment on the two main girders;the peak horizontal force and vertical force of the T-girder and box girder often occur in the negative tilt angle range;When the T-girder and box girder are in the unsubmerged state,they are affected by wave slamming,and the wave force is mainly dominated by slamming force.The T-girder is affected by the space between the girder ribs,and the T-girder experiences multiple slamming actions,while the box girder experiences a single slamming action.The cross-sectional form of the main girder has a significant slamming on the wave force.In the semi-submerged case,and under the same wave height and tilt angle conditions,the vertical force and horizontal peak of the T-girder are greater than those of the box girder,which are dominated by the negative tilt angle.In the fully submerged case,the main girders are mainly subjected to the extreme wave dynamic water pressure,with the T-girder and box girder spaces being filled with water,and the geometric shape of their web plates has a small effect on the verti

关 键 词：极端波浪 桥梁上部结构 波浪力 近海桥梁 数值模拟 

分 类 号：TV139.2[水利工程—水力学及河流动力学] U447[建筑科学—桥梁与隧道工程]