公路桥梁汽车荷载标准值对比分析

Comparative Analysis of Characteristic Value of Vehicle Load for Highway Bridges

为了对中国现行公路桥梁汽车荷载标准值及其效应进行研究,在分析英国、美国、日本、加拿大、欧洲公路桥梁规范中有关汽车荷载规定的基础上,选取中国公路桥梁常用的标准跨径板梁、T梁、组合箱梁、整体式箱梁为样本,将各国规范中的汽车荷载在这些样本桥梁上进行加载,得到了不同规范下的简支梁跨中弯矩、支点剪力效应值,并同中国规范作对比,从而对中国公路桥梁的汽车荷载标准值在世界上所处的位置进行客观的评价。研究结果表明:中国现行规范的公路桥梁汽车荷载效应值在以上各规范中处于中等水平,其方法及结论可供新规范修订时参考。

In order to study the current characteristic value of vehicle load and its effects for highway bridges in China,some details were illustrated in the highway bridge codes of Britain,USA,Japan,Canada,Europe.Plate girder,T-girder,composite box girder,integral-type box girder with standard span which were commonly used in China were taken as sample bridges,and the vehicle loads from different countries＇ codes were applied on these sample bridges to obtain the bending moment at mid-span and shearing force in the end of the simply-supported beam,then these effects were compared with each other so as to locate the position of vehicle load effect in China.The study results show that the effect of highway bridge caused by the vehicle load in current Chinese code has a medium level among those codes in above.The methods and conclusions can provide reference to the revision of code.