摘要
为确定矮塔斜拉桥合理成桥索力,提出一种索力综合优化法。该方法以影响矩阵法为基础,采用数据标准化法将2种或以上不同类型的离散数据变为无量纲的统一化数据,以结构控制截面位移及弯矩综合最小为目标进行索力求解。以南京地铁宁句线矮塔斜拉桥为算例,采用最小弯曲能量法、刚性支承连续梁法和综合优化法对成桥状态的索力进行计算,将计算结果与原设计成桥索力进行对比。结果表明:对于矮塔斜拉桥,在恒载作用下,采用综合优化法计算得到的索力及主梁弯矩分布最为合理;在运营阶段,综合优化法计算得到的索力与原设计索力相比,主梁上、下缘最大压应力分别降低3.3%、3.8%,并且主梁应力分布更优。
This paper presents a comprehensive optimization method to determine the effective tension of stay cables in the completed extradosed bridge.The presented method takes the influence matrix method as the basis,utilizes the data standardization method to convert the discrete data of two or more types into dimensionless unified data,and finally finds the solutions of the tensions of stay cables,supposing the comprehensive displacements and bending moments of the control cross-sections are at the minimum.The extradosed bridge carrying a section of the Nanjing Metro S6 was used as a case for the study.The calculations conducted by using the minimum bending energy method,rigid support continuous beam method and comprehensive optimization method,respectively were compared with the original design tensions of stay cables.The results demonstrate that for the extradosed bridge,the presented comprehensive method generates the most effective tensions of stay cables as well as the most effective distribution of bending moments in the deck,under dead loads.Compared with the original design tensions of stay cables,the calculations conducted by the comprehensive optimization method display 3.3%and 3.8%reduction of the maximum compressive stresses in the top and bottom flanges of the main girder,respectively,as well as better distribution of stresses in the main girder.
作者
朱利明
陈沁宇
刘大帅
ZHU Liming;CHEN Qinyu;LIU Dashuai(College of Transportation Science&Engineering,Nanjing Tech University,Nanjing 210009,China;CCDI(Suzhou)Exploration&Design Consultant Co.,Ltd.,Suzhou 215600,China)
出处
《世界桥梁》
北大核心
2024年第2期88-93,共6页
World Bridges
基金
2022年度江苏省建设系统科技项目(2022ZD044)。
关键词
矮塔斜拉桥
合理成桥状态
索力优化
影响矩阵法
综合优化法
有限元法
extradosed bridge
rational completed bridge state
stay cable force optimization
influence matrix method
comprehensive optimization method
finite element method
