中美桥梁设计规范的内力计算比较研究

现行《公路桥涵设计通用规范》(JTG D60-2004)、《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62-2004)与美国桥梁结构规范(AASHTO LRFD)是不同的体系。着重介绍AASHTO LRFD的内力设计方法和计算公式,并对2套规范作一定量的比较分析研究。结果表明两者计算出的承载力基本相同,但受荷载、材料、横向分布系数、荷载效应分项系数及计算公式等影响,AASHTO LRFD计算得到的组合内力值偏大。

Comparison and Study of Internal Force Calculations in Chinese and American Bridge Design Specifications

The current Chinese General Code for Design of Highway Bridges and Culverts (JTG D60-2004),Design Specification for Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts(JTG D62-2004) and American AASHTO LRFD specification for bridge structures are the different specification systems.In this paper,the design methods and formulae for calculation of internal forces in the AASHTO LRFD are mainly introduced and the calculations in the specifications of the two countries are quantitatively compared,analyzed and studied.The results indicate that the carrying capacity calculated by the specifications of the two countries is basically identical,however,due to the influences of load,materials,lateral distribution coefficients,load effect coefficients and formulae,the values of the combination internal forces obtained by the calculation in the AASHTO LRFD are a little great.