公路钢箱梁正交异性板桥面国内外规范荷载作用局部应力计算与比较  

Calculation and study on deck's local stress in orthotropic steel box girder of highway bridge under standard loads at home and abroad

作　　者：吴臻旺[1] 郑凯锋[1] 苟超[1] 刘鹏[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《四川建筑科学研究》2011年第1期35-39,共5页Sichuan Building Science

摘　　要：针对适于公路钢箱梁正交异性板桥面局部应力计算的车辆轮轴荷载,分析中国、美国、加拿大、日本、英国和欧洲桥梁设计相关规范之间的差异。选择8种规范荷载,根据车轮触地面积,考虑50mm厚铺装层对荷载的扩散效应,确定各规范荷载的加载面积。选择钢箱梁典型结构,计算各荷载作用下桥面局部应力,对吊索中点加载模式,比较该位置顶板顶、底面横向应力和纵肋底面纵向应力;对吊索支点加载模式,比较顶板顶、底面纵向应力。最后,不考虑铺装层扩散效应,进一步计算比较各荷载作用下的上述应力。研究表明,按照我国公路I级荷载计算所得桥面局部应力偏低,加载面积的形状和大小对桥面局部应力影响明显。Concerning vehicle,wheel and vehicle axle loads suitable for deck＇s local stress analysis in orthotropic steel box girder of highway bridge,the differences on codes of China,America,Canada,Japan,U.K.and Europe were studied.After selecting 8 standard loads,according to wheel contact area and diffusion effect of 50mm pavement layer,pressure areas were determined.Based on the typical structure of steel box girder selected,deck＇s local stress was calculated under action of these loads respectively.For the load case of applying these loads at midpoint of slings,transverse stress at top and bottom of the deck and longitudinal stress at bottom of rib here was studied.For the load case of applying these loads at supporting point of slings,longitudinal stress at top and bottom of the deck here was studied.Furthermore,without pavement diffusion effect,the above stress was researched under actions of the 8 loads selected.The results show that calculated stress of deck is relatively lower under action of the grade I highway vehicle load of China,and the effects from the shape and size of pressure area are more significant.

关 键 词：公路钢箱梁 正交异性板桥面 规范荷载 铺装层扩散效应 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]