摘要
地震作用下桥梁的碰撞作用是导致桥梁局部破坏的重要原因之一,为分析连续梁桥在地震作用下的碰撞响应,通过Hypermesh与ABAQUS软件建立了全桥有限元模型,基于三维接触-摩擦碰撞模型分析碰撞作用对梁体与桥墩的影响,研究结果表明:多维地震输入时伸缩缝处碰撞总次数与最大碰撞力远大于单维输入与双维输入工况,为设计安全考虑,碰撞作用会抑制梁间相对位移,对主梁切向位移和主梁压应力影响较大,对径向位移与主梁拉应力影响较小;由于碰撞力的方向与惯性力相反以及支座剪切变形作用,碰撞作用对墩底的剪力及弯矩几乎没有影响。
the collision effect of bridge under earthquake is one of the important reasons for the local damage of bridge.In order to analyze the impact response of continuous beam bridge under seismic action,the finite element model of the whole bridge is established by HyperMesh and ABAQUS software,and the influence of collision on beam and pier is analyzed based on 3D contact friction collision model The total number of collisions and the maximum impact force at the expansion joint are far greater than those under single dimensional input and two-dimensional input conditions.For the sake of design safety,the impact effect will restrain the relative displacement between beams,and have a greater impact on the tangential displacement and compressive stress of the main beam,but less on the radial displacement and tensile stress of the main beam;because the direction of the collision force is opposite to the inertial force and the shear deformation of the support,the impact effect of the impact on the shear stress of the main beam is relatively small The shear force and bending moment at the bottom of pier almost have no effect.
作者
郑祖恩
王宏祥
ZHENG Zuen;WANG Hongxiang(Hunan Communications Research Institute Co., Ltd., Changsha, Hunan 410015,China;Central South University of Forestry and Technology, Changsha, Hunan 410004,China)
出处
《公路工程》
2021年第2期145-151,共7页
Highway Engineering
基金
湖南省交通科技项目(201250)。
关键词
连续梁桥
多维地震
碰撞效应
三维摩擦-接触模型
有限元模型
continuous beam bridge
multidimensional earthquake
collision effect
3D friction contact model
finite element model
