有限元法分析双边箱梁斜拉桥剪力滞效应  

Analysis of Shear Lag Effect of Double Box Girder Cable-Stayed Bridge by Finite Element Method

作　　者：王晓平[1] 邵瑾琨 

机构地区：[1]山东交通职业学院,山东潍坊261206 [2]中铁十九局集团第六工程有限公司,内蒙古阿尔山137805

出　　处：《内蒙古公路与运输》2018年第5期6-9,共4页Highways & Transportation in Inner Mongolia

基　　金：潍坊市科学技术发展计划(2017GX084)

摘　　要：通过对安丘汶河大桥这一典型双边箱梁斜拉桥的剪力滞效应分析,得到该特定截面斜拉桥的剪力滞分布规律,进而指导该桥设计和施工。文章首先利用ANSYS对该桥进行有限元空间整体受力分析,并将个别测点的应变结果与实测应变数据进行对比,显示有限元分析结果和实测结果具有一定的相关性,从而验证了ANSYS有限元模型的准确性,为下一步有限元空间分析的准确性奠定了基础;然后利用验证过的有限元模型对研究对象的剪力滞后效应进行分析,得到该双边箱梁斜拉桥在不同断面的剪力滞分布情况及有效分布宽度沿桥纵向的分布情况,发现该双边箱梁斜拉桥在横断面上的最大应力均出现在内腹板处,而纵向有效宽度在梁端和塔根处均较小,且以梁端处为最小。因此得出结论:该桥的不利控制点在梁端内腹板和塔根内腹板处,在进行斜拉桥设计和施工时应对该两处进行详尽的空间局部研究和严格监控。Through the analysis of shear lag effect of the typical double-cage girder cable-stayed bridge of Anqiuwen River Bridge,the shear lag distribution law of the cable-stayed bridge with specific section is obtained to guide the design and construction of the bridge. Firstly,the ANSYS is used to analyze the overall force of the finite element space of the bridge,and the strain results of the individual points are compared with the measured strain data. It shows that the finite element analysis results have a certain correlation with the measured results,which verifies the accuracy of the ANSYS finite element model and lays a foundation for the accuracy of the next finite element space analysis. Then the verified finite element model is used to analyze the shear lag effect of the research object,and the distribution of shear lag and the distribution of effective distribution width along the longitudinal direction of the double-span cable-stayed bridge are obtained. It is found that the maximum stress on the cross section of the double-sided box girder cable-stayed bridge appears at the inner web,while the longitudinal effective width is small at the beam end and the tower root,and the beam end is the smallest. Therefore,it is concluded that the unfavorable control points of the bridge are at the inner end of the beam end and the inner web of the tower. During the design and construction of the cable-stayed bridge,detailed spatial local research and strict monitoring should be carried out.

关 键 词：桥梁工程 双边箱梁 斜拉桥 剪力滞后 有效宽度 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]