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为了对我国现行公路桥梁荷载基本组合分项系数取值进行研究,在分析英国、美国、加拿大、欧洲公路桥梁规范中有关荷载基本组合分项系数规定的基础上,选取我国公路常用的标准跨径板梁、T梁、组合箱梁、整体式箱梁为样本,在各国规范规定下,计算得到了恒载和汽车荷载作用下的简支梁跨中弯矩、支点剪力值效应,按各国的规范进行基本组合,并同中国规范作以对比,从而对我国公路桥梁的荷载基本组合分项系数在世界上所处的位置进行客观地评价。研究结果表明,我国在恒载分项系数的取值上处于中等水平,在汽车荷载分项系数的取值上处于较低的水平,现行规范的公路桥梁荷载基本组合的效应值处于中等水平,其方法及结论可供新规范修订时参考。
In order to study the value of the sub-coefficient of the basic composite load of highway bridges in our country, based on the analysis of the provisions of sub-coefficient of load combination in the British, American, Canadian and European highway bridge codes, the common standard span Plate girder, T girder, composite box girder and integral box girder are taken as samples. Under the regulations of various countries, the effect of mid-span bending moment and fulcrum shear value under constant load and vehicle load is calculated. , And compares it with the Chinese norms so as to objectively evaluate the location of the basic composite sub-coefficient of the load on the highway bridges and bridges in the world. The research results show that our country is at a moderate level in the value of partial load factor of the road load and has a low level in the value of the partial load factor of the vehicle. The effective value of the basic load combination of the existing highway and bridge load is in the medium level, The method and conclusion can be referenced when the new code is revised.