钢结构曲板极限承载力及曲率影响研究  

Research on Ultimate Bearing Capacity and Curvature Influence of Steel Structural Curved Panel

作　　者：郭辉[1,2] 曾志斌[1,2] 秦大航[3] 赵维贺[3] 

机构地区：[1]中国铁道科学研究院铁道建筑研究所,北京100081 [2]高速铁路轨道技术国家重点实验室,北京100081 [3]北京市市政工程设计研究总院有限公司,北京100082

出　　处：《铁道建筑》2017年第1期1-6,共6页Railway Engineering

基　　金：中国铁路总公司科技研究开发计划(2015G002-A)

摘　　要：为得出圆柱曲板单元直边受压的稳定特征,以北京长安街西延线永定河特大桥钢曲塔为研究对象,通过足尺模型试验研究四边简支边界条件下曲板的极限承载力;同时在考虑材料和几何非线性的条件下,基于ANSYS软件对曲板试件的弹塑性屈曲进行数值分析,进一步得出曲率对极限承载力的影响。结果表明:曲板试件加载过程中,加载方向与垂直板面方向均产生明显变形,达到极限承载力时最大变形发生在靠近曲板中间位置且垂直板面的方向;曲板荷载-位移曲线数值结果与试验结果符合较好,极限承载力小于直板试件对应值;曲板尺寸不变的条件下,随着曲率增大,曲板极限承载力逐渐降低,且局部稳定折减系数与曲率呈线性关系。Taking the steel curved pylon of Beijing Yongding River Bridge on Changman Avenue West extension line as a research object,in order to obtain the characteristics of stability of cylindrical curved panels under compression at straight edge,a full-scale model test was carried out to study the ultimate bearing capacity of curved panel under a boundary condition of simply supported at four sides.Considering the material and geometric nonlinear,the elastoplastic buckling of curved panel was analyzed by using ANSYS software to obtain the influence of curvature on the ultimate bearing capacity.The results showed that the deformation was obvious both in the direction of compressive loading and the direction perpendicular to the panel.The maximum deformation of curved panel under ultimate bearing capacity was located near the central region and perpendicular to the panel.The test results were in accordance with the numerical results such as the load-deformation curves for curved panel and straight panel.And the value of ultimate bearing capacity of curved panel was less than the value of straight panel.Under the same dimension,the ultimate bearing capacity decreased with the increase of curvature.The local stability reduction coefficient of curved panel was linear correlation with the curvature.

关 键 词：斜拉桥钢塔 曲板局部稳定折减系数 足尺模型试验 弹塑性屈曲 极限承载力 荷载-位移曲线 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U441[交通运输工程—道路与铁道工程]