车载作用下大跨度悬索桥钢箱梁受力状态的实验研究

钢箱梁结构在现代大跨度悬索桥体系中较多采用.作为最主要的组成部分之一,其在车辆荷载作用下的受力状态倍受关注.然而目前通过有限元计算还难以获得钢箱梁各细部构造的精确应力值.本文以润扬长江公路大桥南汊悬索桥为背景,介绍了该桥静动载试验中的车辆加载工况和钢箱梁测试截面应力测点的布置等.利用该桥钢箱梁实测应力结果,分析了多种车辆荷载工况下大跨度悬索桥钢箱梁的应力水平及其分布,同时进行了钢箱梁各测试截面受力状态的对比研究,在此基础上总结了大跨度悬索桥钢箱梁结构在车载作用下的受力特点.研究结论为同类钢箱梁的受力状态分析提供了参考依据.

Experimental Study of the Steel Box Girder Force State for a Long-span Suspension Bridge under Vehicle Loads

Steel box girder is widely used in modern long-span suspension bridge structure. As one of the most important bridge components, the force state of steel box girder under vehicle loads is especially concerned. However, it is difficult to achieve accurate stress values on each part of a steel box girder through finite element calculation. In this paper, taking Runyang Suspension Bridge (RSB) as an example, the vehicle load cases and stress measurement point layout of a selected steel box girder section in field test of RSB are presented. Based on the measured stress results, the stress level and its distribution on the steel box girder of a long-span suspension bridge under various vehicle load cases was analyzed, and the force state comparison analysis of different steel box girder sections was carried out. Finally, the steel box girder force characteristics of a long-span suspension bridge were summarized based on above results, which provides references for analyzing force state of similar type steel box girder of long-span suspension bridges.