跨海桥梁箱梁结构受波浪力作用试验研究  

Experimental study on wave loads applied on box girders in coastal bridges

作　　者：张家玮[1] 祝兵[1] 康啊真 黄博[1] 

机构地区：[1]西南交通大学,四川成都610031

出　　处：《土木工程学报》2017年第12期80-86,共7页China Civil Engineering Journal

基　　金：国家自然科学基金(51178397);铁道总公司科技研究开发计划课题重点项目(2013G014-C);四川省应用基础重大前沿项目(2017JY0003)

摘　　要：为研究近海桥梁箱梁结构在风暴潮和飓风波浪作用下的灾变毁坏问题,以平潭海峡公铁两用大桥的水文条件和结构参数为基础,开展1∶30水槽模型试验研究箱梁结构所受波浪力作用。考虑不同梁体高程、淹没深度和浪高参数对梁体波浪力的影响,分析不同波浪条件下梁体受到的波浪力特点,以及波浪力峰值在不同参数影响下的变化规律。研究结果表明:波浪力包含准静力和抨击力两种成分,当淹没深度较低时抨击力作用较大,并随淹没系数的增加而不断减小;梁体处于淹没状态时,梁体底部所受的浮托力作用大大减轻梁体的有效自重,在水平向波浪力和倾覆弯矩的联合作用下导致梁体的脱落破坏;当淹没系数为1.5时,箱型梁体所受的浮托力达到最大,梁体在此条件下最容易发生脱落。To analyze the damage mechanics of coastal bridge girders under wave loads induced by the storm surges and the hurricane, a 1 ： 30 scale box girder model test was conducted in a wave basin based on the hydrological conditions and the structural parameters of the Pingtan Rail-Road Sea-Crossing Bridge. The influence of three parameters, i.e. bridge elevation, submerged depth and wave height, on the wave forces is studied. The wave force characteristics of the beam under different wave conditions are analyzed, and the variation of the maximum wave forces under different parameters are compared. It is shown that the wave force is composed of the quasi-static force and the slamming force. When the girder is in low submersion, the slamming force will get large and decrease with the submersion depth. When the box girder is submerged, the uplift force acting on the bottom of girder can reduce the effective weight of the girder, thus it fails to work under the combined actions of the horizontal wave force and the overturning moment. The analysis results show that the uplift force reaches the maximum value when the submersion coefficient is 1.5.

关 键 词：水槽模型试验 极端波浪荷载 上部结构 箱型梁体 波浪力 浮托力 

分 类 号：TU398.9[建筑科学—结构工程] TV139.25[水利工程—水力学及河流动力学]