单索面斜拉桥施工主梁剪力滞规律  

Research on Shear Lag Effect in Main Girder of Cable-Stayed Bridge with Single Cable Plane in Construction Stage

作　　者：李艳凤[1,2] 梁力[1] 赵永生[3] 王福春[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 [3]辽宁省交通高等专科学校,辽宁沈阳110122

出　　处：《沈阳建筑大学学报（自然科学版）》2013年第3期490-495,共6页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51204035);辽宁省交通厅重点科研项目(0408-2)

摘　　要：目的研究单索面斜拉桥主梁施工阶段张拉索力及施加挂蓝荷载情况下,截面的受力特性和剪力滞效应.方法以沈阳某单索面斜拉桥为研究背景,采用有限元理论,通过建立空间有限元模型进行分析.结果边界条件相似的截面剪力滞系数变化规律有一定相似性;施工阶段各个截面均表现出随着索力分量产生的轴向力增大,主梁剪力滞效应系数有所降低,施工合拢后各个截面的剪力滞系数为1.042～1.692,对比施工过程中剪力滞系数明显降低.结论施工过程中截面剪力滞效应比施工合拢后更为明显.因此,在施工过程中应该高度重视主梁剪力滞效应的影响,避免混凝土主梁的开裂.The paper aims to research and analyze characteristics and the shear lag effect in main girder of cable-stayed bridge. It was based on a single cable plane cable-stayed bridge in Shenyang as the research background, using the finite element theory, through the establishment of space finite element model. The re- suits show that boundary conditions are similar to box section, the change law of shear lag coefficient has some similarities. As the axial force increases, the shear lag coefficient of main girder decreases. The shear lag coefficient is 1.042 ~ 1.692 after the closed. Comparing the construction stage of shear lag coefficient -6. 829 -4. 833 it is decreased obviously, shear lag coefficient is more apparent in construction stage. Therefore main girder during construction should attach great importance to the influence of shear lag effect, to avoid the cracking of concrete girders.

关 键 词：单索面斜拉桥 主梁 剪力滞效应 施工阶段 有限元分析 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]