宽幅矮塔斜拉桥主梁截面剪力滞效应分析  

Analysis of the Shear Lag Effect of Wide Concrete Box Grider of the Extradosed Cable-stayed Bridge

作　　者：时建云 何沛祥[1] SHI Jianyun;HE Peixiang(School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei, Anhui 230009, China)

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009

出　　处：《安徽建筑大学学报》2017年第4期5-8,共4页Journal of Anhui Jianzhu University

摘　　要：以某矮塔斜拉桥为工程背景,通过计算多种工况下的剪力滞系数来研究主梁截面的剪力滞效应。为了研究不同因素对于控制截面剪力滞效应的影响,选取了7个施工工况进行分析,采用有限元软件Midas FEA分别建立了相应的实体模型。在此基础上,使用有限元软件Midas Civil建立了其中5个工况所对应的杆系模型。从而计算分析控制截面的正应力和剪力滞效应。将实体模型的计算结果与现场实测应力值进行了对比分析,得出了一些对于宽幅部分斜拉桥施工应力监测有益的结论。This paper chose an extradosed cable-stayed bridge as the engineering background and studied the shear lag effect of main girder cross section through the calculation of shear lag coefficient of various conditions.In order to study the influence of different factors on the controlling section's shear lag effect,this paper selected7construction steps to study and established the corresponding solid model using a finite element software Midas FEA.On this basis,using Midas Civil established a frame model to study5steps in the7steps.Then this paper calculated the control section's normal stress and analyzed the shear lag effect.The solid model calculation results and the measured results have been contrasted and analyzed and this paper obtained some beneficial conclusions for stress monitoring of the broad width extradosed cable-stayed bridges under construction.

关 键 词：剪力滞效应 初等梁理论 有限元模型 应力监测 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]