单索面斜拉桥张拉索力对主梁剪力滞分布规律影响的研究  

Study of Influence of Stay Cable Tensioning on Shear Lag Distribution Pattern in Main Girder of a Cable-Stayed Bridge with Single Cable Plane

作　　者：李艳凤[1,2] 梁力[1] 王福春[1,2] 

机构地区：[1]东北大学土木工程研究所,辽宁沈阳110004 [2]沈阳市市政工程设计研究院,辽宁沈阳110015

出　　处：《世界桥梁》2013年第1期49-52,共4页World Bridges

基　　金：辽宁省交通厅重点科研项目资助(0408-2)

摘　　要：以沈阳市某双折线形独柱式塔单索面预应力混凝土斜拉桥为背景,采用有限元法建立空间有限元模型,分析该桥主梁成桥阶段在张拉1对索力时箱梁的剪力滞分布规律。分析结果表明:距离索力作用点越近,箱梁顶缘的剪力滞效应越明显,箱梁截面的剪力滞系数越大;上顶板在横桥向靠近拉索锚固作用点处的应力很大,随着作用点的距离增大而不断减少,且逐渐趋于均匀。For this study, a PC cable-stayed bridge with two kinked single-column pylons and single cable plane was cited as an example. The spatial finite element model of the bridge was es tablished to analyze the pattern of shear lag distribution in the main girder （box girder） when one pair of the stay cables were being tensioned in the completed bridge stage. The results of the a- nalysis show that the distance to the action point of the cable force dictates the intensity of the shear lag effect, namely, the shorter the distance, the more significant the shear lag effect in the top edge of the box girder and the greater the shear lag coefficient of the cross section of the box girder; the stress in the top slab near the anchor point of the stay cable in the transverse bridge direction is great, the stress gradually abates as the distance to the action point increases, and the stress distribution is gradually becoming uniform.

关 键 词：斜拉桥 箱形梁 剪力滞效应 张拉索力 有限元法 

分 类 号：U448.27[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]