钢箱梁斜拉桥结构参数敏感性分析

Sensitivity analysis of structural parameters of steel box girder cable-stayed bridge

为保证钢箱梁斜拉桥成桥后的线形和内力满足设计要求,以某跨海斜拉桥为工程依托,采用MIDAS/Civil有限元软件建立全桥空间杆系模型对相关设计参数进行敏感性分析,研究主梁自重、斜拉索索力、施工临时荷载等结构参数对成桥状态的主梁应力、主梁线形和拉索索力的敏感程度。结果表明:主梁自重和斜拉索二次张拉索力对成桥状态的结构行为有显著影响,属于敏感性因素;主梁应力和斜拉索索力对结构参数的敏感程度低于主梁线形。研究结果可为确定监控关键控制量、结构参数识别以及误差修正提供科学依据,也对其他类似桥梁工程具有借鉴意义。

To ensure that the alignment and internal force of the steel box girder cable-stayed bridge meet the design requirements,a spatial model of the whole bridge based on a sea-crossing cable-stayed bridge established using Midas/civil software to analyze the sensitivity of relevant design parameters.The effect of the structural parameters such as the self-weight of main girder,force of cable stay cable and temporary load of constructionon the structural responses such as main girderstress,main girderalignment,and cable force of the completed bridge was studied.The results show that the self-weight of the main girder and the secondary tension of the stay cable have significant influence on the structural responses of the completed bridge,creating sensitive factors.The stress of main girder and cable force are less sensitive to structural parameters than the main girder alignment.This study can provide scientific basis for determining the key control quantity of monitoring,identification of structural parameters and error correction as well as reference for other similar bridge projects.