涌波作用下小箱梁受荷机理试验  

Experiment on Wave Surge Forces on Multibox Girder

作　　者：杨绍林 齐怀远 杨万理 王宁[1] 郑元勋[1] YANG Shao-lin;QI Huai-yuan;YANG Wan-li;WANG Ning;ZHENG Yuan-xun(School of Water Conservancy and Transportation,Zhengzhou University,Zhengzhou 450001,Henan,China;School of Civil Engineering,Xinjiang Institute of Engineering,Urumqi 830023,Xinjiang,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,Sichuan,China)

机构地区：[1]郑州大学水利与交通学院,河南郑州450001 [2]新疆工程学院土木工程学院,新疆乌鲁木齐830023 [3]西南交通大学土木工程学院,四川成都610031

出　　处：《中国公路学报》2025年第2期33-46,共14页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(52008375);河南省科技攻关项目(222102320038);中国博士后科学基金项目(2020M672278)。

摘　　要：为了明晰涌波作用下小箱梁的受荷机理及荷载计算方法,采用溃坝波试验模拟了系列涌波,开展了系列涌波与小箱梁的水动力相互作用试验。系统深入地分析了相互作用过程特性,梁体外表面不同位置的压力时程特性,水平力、竖向力和弯矩的冲击峰值随着初始水深、来流波高、梁体高程的演变规律;基于试验研究给出了涌波作用下小箱梁荷载冲击峰值的计算方法。研究结果表明:波前形态随着来流波高与初始水深之比逐渐变化;梁体的水平力、竖向力和弯矩的冲击峰值仅由梁体前侧和梁底前部的水体压力产生;梁体前侧、后侧、顶部及底部不同位置处的压力时程具有显著差异;水平力冲击峰值随着梁体中点与最大波高中点之间的偏离程度的减小而增大;当梁体位于来流波高中上部时,竖向力冲击峰值随着梁体高程的减小而增加,梁体高程较小时该情况有所变化;静水压力在竖向力冲击峰值中的占比显著大于其在水平力冲击峰值中的占比。所提计算方法可为小箱梁涌波荷载快速计算提供参考和借鉴。To study the force mechanism and force calculation method of a multibox girder under wave surges,a series of wave surges were experimentally generated using dam-break waves,and a series of hydrodynamic interaction experiments between these wave surges and multibox girder were performed.The characteristics of the entire interaction process,pressure time-history characteristics at different positions on the outer surface of the girder,and the evolutions of the impact peaks of horizontal force,vertical force,and moment,as a function of the initial water depth,incoming wave height,and girder elevation,were systematically presented and analyzed.Based on the experiments conducted in this study,a calculation method is proposed for the impact peaks of forces and moment of multibox girder under wave surges.The results indicate that the wavefront profile gradually varies with the ratio of the incoming wave height to the initial water depth.The impact peaks of horizontal force,vertical force,and moment on the girder are only generated by the water pressures on the front side of the girder and the front part of the girder bottom.There are obvious differences in pressure time histories at different positions on the front,back,upper,and downward sides of the girder.The horizontal impact peak force increased as the deviation between the midpoint of the girder and the midpoint of the maximum wave height decreased.When the girder was located at the upper and middle parts of the incoming wave height,the vertical impact peak force increased when the girder elevation decreased,and this situation varied for small girder elevations.The proportion of hydrostatic component in vertical impact peak force was larger than that in horizontal impact peak force.The proposed calculation method can provide a reference for the rapid calculation of wave surge forces on multibox girders.

关 键 词：桥梁工程 涌波荷载 试验研究 小箱梁 溃坝波 计算方法 

分 类 号：U443[建筑科学—桥梁与隧道工程]