单索面公轨双层斜拉桥传力机理及稳定性分析  

Research on the Stress Transferring Mechanism and Stability of the Cable Stayed Bridge with Single Cable Plane

作　　者：徐龙[1] 陈晓英[1] 

机构地区：[1]中交第二公路勘察设计研究院有限公司,武汉市430056

出　　处：《公路》2017年第5期81-86,共6页Highway

摘　　要：与传统斜拉桥的双索面传力方式不同,单索面中锚式斜拉桥仅通过中央拉索将桥梁自重及桥面上荷载传递到桥塔。为研究该单索面斜拉桥的稳定性及受力特性,以东水门双塔三跨式斜拉桥为研究背景,建立了全桥三维有限元数值模型。该模型充分了考虑上下层桥面板之间、桁梁节段之间的相互作用关系以及纵梁、横梁及加劲肋对上下桥面板的加固效应。计算结果针对桥面系统的整体变形、应力分布及应力传递机理等展开分析,并重点分析了偏载作用下结构的变形模式及应力变化特征。研究结果表明,索塔及拉索的位置分布对桥梁结构整体变形及应力分布影响较大,上桥面拉索力向桥面两侧均匀传递;此外,跨中结构在偏载活载作用下主要发生横向偏转及扭转变形。Different with the cable stayed bridge with double cable plane, the cable stayed bridge with single cable plane transfers tbe self weight and load on deck through central cable to bridge tower. In order to study the stability and the stress characteristics of the bridge with single cable plane, based on the Dongshuimen Bridge, a twin tower three spans cable-stayed structure, three-dimensional finite element model is built. The interaction between the upper and lower bridge deck, the relationship between girder segments, the reinforcement effect from longitudinal beams, crossing beams, steel plates are taken into consideration in this model. The overall displacement, stress distribution and the changing characteristics of the deck system are analyzed, and the transformation mode and stress change features of structures are focused on under bias load actions. The results show that the tower position and the distribution of cables have a great influence on the displacement and the stress of the bridge, and the cable force of upper deck transfers towards both sides, and in addition, transverse rotation and distortion occurs at span-middle due to the biased live load.

关 键 词：斜拉桥 单索面 公轨双层 数值模型 稳定性 传力机理 扭转变形 分析 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]