自锚式斜拉-悬索组合体系桥梁受力性能分析  

Mechanical Performance Analysis of a Self-anchored Suspension and Cable-stayed Composite Bridge

作　　者：王思锐 孙荣晓 Wang Sirui;Sun Rongxiao(Shaanxi Transportation Holding Group Co.,Ltd.,Xi'an 710060,China;Shandong Traffic Engineering Supervision Consulting Co.,Ltd.,Jinan 250000,China)

机构地区：[1]陕西交通控股集团有限公司,陕西西安710060 [2]山东省交通工程监理咨询有限公司,山东济南250000

出　　处：《市政技术》2023年第11期30-36,共7页Journal of Municipal Technology

摘　　要：为了解悬索系统和斜拉系统分开设置在中跨和边跨的自锚式斜拉-悬索组合体系桥梁结构受力性能,依托某工程实例,利用Midas Civil程序建立全桥空间杆系模型,分析了该桥梁在成桥状态和运营阶段时,不同作用效应组合下主梁、缆索系统(主缆、分缆、斜拉索和吊杆)、桥塔的受力情况和桥梁结构刚度。分析结果表明:该桥梁因具有空间索形和中跨悬索系统、边跨斜拉系统的特点,导致斜拉索和吊杆水平分力较大;缆索系统、主梁与桥塔因协同作用复杂,斜拉索索力呈现出由PES1→PES5逐渐增大的规律,分缆索力分布呈“√”形,因此该类型桥梁结构的受力情况应遵循特殊结构重点分析原则;边跨混凝土箱梁全截面受压,最大压应力小于规范限值,中跨钢箱梁和桥塔最大拉、压应力均小于钢材的容许应力,主缆、分缆、斜拉索和吊杆的最大索力与其对应的应力均远小于平行钢丝屈服应力,应力幅和安全系数均在规范限值内;中跨钢箱梁竖向刚度和边跨混凝土箱梁考虑变形长期增长后的竖向刚度均小于相应规范限值。因此,该桥梁结构受力安全、合理。In order to understand the structural performance of a self-anchored suspension and cable-stayed com-posite bridge with separating suspension and cable-stayed tension systems at the mid-span and side spans,a com-prehensive spatial truss model of the entire bridge was established by the Midas Civil program based on a specific engineering example.During the construction and operational stages,the force of the main girder,cable system(main cables,branch cables,cable-stayed tension,and suspension rods),bridge towers and the bridge's overall stiffness were analyzed under various combinations of loading conditions.The results indicate that the horizontal component forces is significant due to the cable-stayed tensions and suspension rods spatial arrangement of the bridge's cables,along with the characteristics of the suspension system at the mid-span and the cable-stayed ten-sion system at the side spans;The interaction between the cable system,main girder,and bridge towers is complex.The cable force gradually increase from PES1 to PES5.The distribution of the force of branch cables is in the shape of"V",Therefore,the force of this bridge structure should focus on special structural;The concrete box girder at the side spans is subjected to compression,with the maximum compressive stress lower than the specified limit.The maximum tensile and compressive stresses in the steel box girder at the mid-span and the bridge towers are lower than the allowable stress of the steel material.The maximum cable force in the main cables,branch cables,cable-stayed tension,suspension rods and the corresponding stresses are significantly lower than the yield stress of parallel steel wires.Both the stress amplitude and safety factor are within the specified limits;Considered long-term defor-mation growth,both the vertical stiffness of the steel box girder at the mid-span and the concrete box girder at the side spans are lower than the corresponding specified limits.Therefore,the bridge structure is safe and rational.

关 键 词：自锚式 斜拉悬索协同体系 缆索系统 混凝土箱梁 钢箱梁 

分 类 号：U448.216[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]