连续梁桥的活载正应力偏载系数研究  

Study of Eccentric Load Coefficient of Live Load Normal Stress of Continuous Beam Bridge

作　　者：苏俭[1] 刘钊[1] 阮静[2] 

机构地区：[1]东南大学土木工程学院,江苏南京210096 [2]江苏省长江公路大桥建设指挥部,江苏泰州225321

出　　处：《世界桥梁》2009年第4期34-37,共4页World Bridges

基　　金：江苏省交通科学研究计划项目(08Y29)

摘　　要：在变截面连续箱梁桥中,由于活载的内力影响面的形状比较复杂,箱梁几何构造对约束扭转正应力的影响沿桥跨度是变化的,因而,不宜对全桥采用统一的偏载系数。通过理论分析和基于实桥的有限单元的数值计算,探讨变截面连续梁偏载系数沿跨度的分布规律,提出实用的偏载系数取值建议,供工程设计参考。For the continuous box beam bridge with variable cross section, it is not advisable to use an uniform eccentric load coefficient for the whole bridge because the shape of the influen tial range of live load internal force is complicated and the influences of the geometric structure of the box beam on the restrained torsional normal stress along bridge spans are variable. Through the theoretic analysis and the finite element numerical calculation for the actual bridges, the distribution laws of the eccentric toad coefficient of the box beam bridge along the bridge spans are discussed and the selection of practical values for the eccentric load coefficient is proposed to provide reference for the engineering design.

关 键 词：连续梁桥 变截面连续梁 正应力 空间效应 偏载系数 

分 类 号：U448.215[建筑科学—桥梁与隧道工程] U441.5[交通运输工程—道路与铁道工程]