中美公路桥梁规范设计汽车荷载对比

Study of vehicle load between China and America in bridge design specification

为对我国汽车荷载标准值在目前所处世界水平有较为客观的定位,同时,为我国将来公路桥梁新规范的修订建立基础。首先阐述中国新旧规范以及美国HL-93规范对设计汽车荷载的规定;其次以6、8、10、13、16、20、25、30 m不同跨径T型截面简支梁桥为基准,系统推算不同跨径T型简支梁桥在中美规范规定汽车荷载作用下的跨中弯矩和支点剪力;最后,系统对比分析荷载效应的绝对值与相对值。研究结果表明:与美国规范相比,中国规范相对来说较为保守,且不够直观,我国现行汽车荷载标准规范在国际上大致处于中等位置,在考虑与原规范联系性的基础上适当借鉴美国规范。

In order to have a more objective position on the world level of the standard value of vehicle load in China and make a foundation for the revision of the resent standard of Highway Bridge. This paper has explained the China＇s new and old code and the United States HL-93 specification for the design of vehicle loads,then take 6,8,10,13,16,20,30 meters long span bridge with T shaped beam for example,to make a systematic calculates of mid-span moment and shear force at supporting point of T- shaped beam,which is under the action of vehicle load in the Chinese and American Codes. In the end,the absolute value and the relative value of the load effect are analyzed systematically. The results show that： compared with the United States,the Chinese standard is relatively conservative and not intuitive,China＇s current vehicle load standard specification in the international is roughly in the middle position,considering the contact with the original specification,the appropriate reference to the United States.