公路桥梁活载模式研究

对现行中国、美国、英国、加拿大、欧洲公路桥梁规范中的汽车荷载标准进行分析研究。结合不同跨径的连续梁,通过建立有限元模型,对各规范汽车荷载产生的内力响应进行计算分析,并将汽车荷载效应与恒载效应进行组合,得出各种荷载效应的比例系数。计算结果显示:各公路桥梁规范的汽车荷载在取值、布置形式以及计算系数等方面均存在较大的差异,在所研究的连续梁跨度范围内,英国BS 5400规范的活载效应值最大,但是组合后的总效应各规范基本处于同一水平。

Study of Live Load Modes for Highway Bridges

The truck load criteria in the current codes for highway bridges of China,USA,Great Britain,Canada and Europe were analyzed and studied.In the light of the continuous girders having different span length and by means of finite element models,the internal force responses produced by the truck load in the codes of the different countries were calculated and analyzed,the truck load effect was then combined with the dead load effect and the ratio coefficients of the different load effect were obtained.The results of the calculation reveal that the selection of values,ways of load arrangement and calculation coefficients of the different countries differ a great deal.Within the range of the study herewith,the values of the live load effect in BS 5400 is the greatest,however,the total effect after the load combination of all countries is basically on the same level.