基于连跨效应的船撞作用下连续梁桥墩顶约束刚度分析  

Top Restraint Stiffness Analysis of Continuous Girder Bridge Under Ship Collision Based on Effect of Continuous Span

作　　者：孙慧明[1] 方海[1] 祝露[1] 韩娟[1] 刘伟庆[1] 

机构地区：[1]南京工业大学土木工程学院,江苏南京211816

出　　处：《建筑科学与工程学报》2015年第5期89-95,共7页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(51008157);江苏省"333高层次人才培养工程"科研项目(BRA2013189);江苏省六大人才高峰项目(JZ-006)

摘　　要：基于弹性分析,重点考察连续梁桥上部结构对被撞桥墩的约束作用,通过分向传播法分析连续梁桥支座横向剪切刚度、桥墩跨数、跨距、边跨桥墩抗侧刚度对被撞桥墩的影响,归纳各参数对被撞桥墩墩顶位移的影响作用。在此基础上,通过有限元软件分析苏通大桥引桥在船舶撞击力作用下上部结构对被撞桥墩的顶端约束刚度,并与理论推导出的约束刚度进行对比。研究结果表明:与悬臂墩模型相比,在相同撞击力作用下,考虑连跨效应的被撞桥墩墩顶位移减小9.94%;随着边跨桥墩抗侧刚度、跨距、支座横向剪切刚度的增大,被撞桥墩墩顶位移逐渐减小;随着跨数的减少,对被撞桥墩的约束作用越小;相邻第1跨对被撞桥墩约束的影响率在90%以上。Authors focused on the restraint effect of the superstructure of continuous girder bridge on the hitting pier based on the elastic analysis . The effect of transverse shear stiffness of bearings of continuous girder bridge ,number of spans ,span size ,and lateral stiffness of the side pier w as studied based on the propagating method along separate route ,and the effect of each parameter was concluded .Based on this ,the upper restraint stiffness of the hitting pier imposed by the Sutong bridge＇s superstructure and substructure was analyzed using the finite element software ,and was compared with the theoretical value . The study results show that when compared with the single model of the pier , the top of the hitting bridge pier displacement decreases 9 .94% at the same impact force .When increasing the lateral stiffness of side spans , span size and transverse shear stiffness of the bearing ,the top displacement of the hitting pier is decreased .With the decrease of the number of spans ,the restraint effect of the hitting pier is smaller .The effect ratio of the first span on the the restraint of hitting pier is more than 90% .

关 键 词：连续梁桥 顶端约束刚度 分向传播法 顶端位移 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]