斜拉桥分离式双箱混合梁空间应力分析

Spatial Stress Analysis of Separate Twin-Box Hybrid Beams of Cable-Stayed Bridges

基于银洲湖大桥工程,研究斜拉桥分离式双箱混合梁空间应力分布,采用全桥杆系有限元模型计算了主梁内力分布。采用主梁标准节段精细有限元模型计算了标准节段分别在纵向受力体系与横向受力体系下的空间应力分布,计算结果表明,目前设计方案满足规范抗裂及强度要求,斜拉桥桥面板有效宽度系数约为0.9,剪力滞效应对斜拉桥主梁刚度折减影响有限。

Based on the Yinzhou Lake Bridge project,the spatial stress distribution of the separate twin-box hybrid beam of the cable-stayed bridge is studied.The internal force distribution of the main beam is calculated by the finite element model of the full bridge system.The spatial finite element model of the standard beam segment is used to calculate the spatial stress distribution of the standard beam segment under the longitudinal force bearing system and the lateral force bearing system.The calculation results show that the current design meets the requirements of crack resistance and strength,the effective width coefficient of the deck of the cable-stayed bridge is about 0.9,and the shear lag effect has limited influence on the reduction of the stiffness of the main girder of the cable-stayed bridge.