钢桥塔节段局部稳定试验  

Experiment on Local Buckling of Steel Bridge Tower Segment

作　　者：王春生[1] 王茜[1] 俞欣[1] 张子华[2] 徐岳[1] 

机构地区：[1]长安大学桥梁与隧道陕西省重点实验室,陕西西安710064 [2]交通运输部公路科学研究院,北京100088

出　　处：《中国公路学报》2009年第6期74-81,共8页China Journal of Highway and Transport

基　　金：国家西部交通建设科技项目(200431822317);霍英东教育基金会高等院校青年教师基金项目(101078)

摘　　要：对带切角的钢桥塔节段模型进行了轴心受压局部稳定试验研究,得到了模型的局部失稳极限荷载、失稳模态、变形及应变规律。在此基础上,建立了钢桥塔节段的有限元模型,分别进行了第1类稳定计算和考虑材料、几何双重非线性及结构初始缺陷的第2类稳定计算。结果表明:第2类稳定计算得到的失稳极限荷载与实测荷载较为接近,两者相差10%;带切角矩形截面钢桥塔较矩形截面钢桥塔板件间的相关作用更加明显,对矩形截面钢桥塔进行切角,形成宽厚比较小的壁板,可以对宽厚比较大的弱板提供有效约束。An axial compression experiment on local buckling for a segment tower model with chamfer was carried out.The ultimate stability bearing load,local buckling mode,deformation and strain rules of the model were obtained.Then,a finite element model of steel bridge tower segment was established.The linear and nonlinear stability analyses including both material nonlinearities and geometric nonlinearities,as well as the structural initial imperfection were executed respectively.The results show that the ultimate stability bearing load by nonlinear analysis is close to the test load,they only have 10% deviation.For steel bridge towers,the correlation of the panels in the section of rectangle with chamfers is more obvious than that in the section of rectangle.If the four angles of the rectangle section were cut off,a panel with the smaller ratio of width to thickness forms,which can supply effective constraint to other weak panels with the larger ratio of width to thickness.

关 键 词：桥梁工程 钢桥塔 试验研究 局部稳定 非线性 有限元分析 

分 类 号：U443.38[建筑科学—桥梁与隧道工程]