悬索桥主索鞍承载力影响因素及结构优化  

Influencing factors and structural optimization of main cable saddle bearing capacity of suspension bridge

作　　者：钟昌均 王忠彬[3] 柳晨阳 ZHONG Chang-jun;WANG Zhong-bin;LIU Chen-yang(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;School of Civil Engineering,Southeast University,Nanjing 211189,China;China Railway Bridge Survey and Design Institute Group Co.,Ltd.,Wuhan 430050,China)

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]东南大学土木工程学院,南京211189 [3]中铁大桥勘测设计院集团有限公司,武汉430050

出　　处：《吉林大学学报（工学版）》2021年第6期2068-2078,共11页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51178396)。

摘　　要：为了解决主索鞍安全性与经济性间的矛盾,对主索鞍极限承载力及其影响因素进行了研究。通过对悬索桥主索鞍结构设计参数进行归纳和总结,利用Autodesk Inventor软件建立了参数化几何模型,导入大型通用有限元软件ABAQUS中进行大量数值模拟,系统研究了主索鞍承载力影响因素及其变化规律,并对结构进行合理优化。结果表明:原设计索鞍的极限承载力为设计荷载的3倍,具有足够的安全储备;铸钢材料强度对主索鞍承载力有很大影响,而容器钢材料强度对主索鞍承载力的影响很小;横肋厚度及数量对索鞍承载力有很大影响,鞍槽侧壁厚度、是否设置横肋的纵向加劲肋以及腹板厚度对索鞍承载力的影响较小;随着索鞍横向尺寸的减小,索鞍横向刚度和极限承载力也随之下降;优化后的索鞍其极限承载力降低了10%,但用钢量降低了20%。In order to solve the contradiction between the safety and economy of the main saddle of suspension bridge, the ultimate bearing capacity and influencing factors of the main saddle were studied. By summarizing the design parameters of the main saddle structure of the suspension bridge, the parametric geometric model is established using Autodesk Inventor software, and the large-scale general finite element software ABAQUS is imported for large number of numerical simulation studies. The influencing factors of the cable saddle bearing capacity and their changing law are investigated, and the reasonable optimization of the structure is performed. The analysis results show that the ultimate bearing capacity of the original design cable saddle is 3.00 times the design load, which has sufficient safety reserves. The strength of cast steel material has great influence on the bearing capacity of the main cable saddle, while the material strength of the container steel has little influence. The thickness and number of the transverse ribs has a great influence on the load-bearing capacity of the saddle. The thickness of the sidewall of the saddle groove, whether the longitudinal stiffener is provided with transverse ribs, and the thickness of the web have less influence on the load-bearing capacity of the saddle. The transverse rigidity and ultimate bearing capacity of the saddle will decrease with reduction of the transverse size of the saddle. The ultimate bearing capacity of the optimized saddle is reduced by 10%, while the steel consumption is reduced by 20%.

关 键 词：桥梁工程 主索鞍 极限承载力 参数分析 结构优化 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]