单箱多室宽箱梁的翼缘有效宽度取值研究  

Research on Effective Flange Width of Wide Box Girder with Single Box Multi Room

作　　者：王富平 蔺鹏臻[1] 

机构地区：[1]兰州交通大学甘肃省道路桥梁与地下工程重点实验室,甘肃兰州730070

出　　处：《铁道建筑》2017年第10期6-11,共6页Railway Engineering

基　　金：国家自然科学基金(51368031);甘肃省基础研究创新群体项目(1506RJIA029)

摘　　要：以南宁大桥引桥为例,分别采用中国公路桥梁规范、美国AASHTO规范和有限元分析方法对比研究了桥梁在自重和移动荷载作用下典型截面的翼缘有效宽度。计算结果表明:在自重和对称移动荷载作用下,对于连续梁边跨和中跨跨中截面,翼缘有效宽度沿横桥向分布比较均匀,按中国规范得到的翼缘有效宽度相对误差在11%以内,而按美国规范计算的相对误差在10%~27%;对连续梁支点截面,按中国规范得到的翼缘有效宽度取值偏于保守,最大相对误差达40%,而按美国规范所得结果偏于不安全,相对误差达-38%;在偏载作用下,翼缘有效宽度沿横桥向变化较大,按中国规范得到的翼缘有效宽度在边跨和中跨跨中截面比实际要大,而美国规范相对保守。Taking the approach bridge of Nanning bridge as an example,the effective flange widths of typical section under the dead weight and the moving load were researched by using the China highway bridge specification,American AASHTO specification and finite element model. The results showed that under the dead weight and the moving load,for the middle section of side and middle span,the distribution of effective flange width was relatively uniform along the transverse direction. The effective flange width obtained by Chinese specification was close to the result of finite element,error was less than 11%,while the error was in 10% ~ 27% by American specification. For the fulcrum section,the effective flange width obtained by Chinese specification was too conservative,the maximum error came to 40%,while the result by American specification was partial to unsafe,the error came to -38%. Under the eccentric load,the effective flange width was varied greatly along the transverse direction,and the value obtained by Chinese specification was larger than the actual at the middle section of side and middle span,while the value by American specification was relatively conservative.

关 键 词：公路桥梁 有效翼缘宽度 有限元分析 宽箱梁 剪力滞效应 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]