考虑碰撞效应的混凝土连续梁桥纵向挡块参数分析研究  

Research on Parameter Analysis of the Longitudinal Shear Key of Concrete Continuous Girder Bridge Considering the Collision Effect

作　　者：徐秀丽[1] 张勇[1] 潘安[1] 赵伊博[1] 李雪红[1] XU Xiuli;ZHANG Yong;PAN An;ZHAO Yibo;LI Xuehong(College of Civil Engineering,Nanjing Tech University,Nanjing,Jiangsu 211816,China)

机构地区：[1]南京工业大学土木工程学院,江苏南京211816

出　　处：《公路工程》2019年第1期92-98,215,共8页Highway Engineering

基　　金：江苏省科技支撑计划(BE2014716);江苏省交通科学研究计划项目(2013Y12)

摘　　要：以中小跨度典型梁式桥为工程背景,利用有限元软件建立桥梁结构的多尺度模型,基于接触单元理论,提出能考虑碰撞过程中能量消耗的碰撞模型,考虑地震作用下桥梁结构梁体与纵桥向限位挡块间的碰撞效应,对比分析是否设置挡块,以及墩高、碰撞刚度、碰撞阻尼等对桥梁结构地震响应的影响。结果表明:设置纵向挡块之后,过渡墩的墩底剪力和墩顶位移有所增加,但墩梁相对位移大幅度降低,可很好地防止纵向落梁震害的发生;碰撞刚度的增大,会增大墩底剪力和墩顶位移,减小主梁位移和墩顶相对位移,对于与本文分析类似规模的桥梁,建议纵向挡块的碰撞刚度取10~8N/m较合适;纵向挡块的碰撞阻尼对桥梁的地震响应影响相对较小,在设计时可不予特别考虑。Take the typical short and medium span beam bridges as engineering background,a multi-scale model of bridge structure is built by the finite element software,based on the contact unit theory,established a collision model which can consider energy dissipation in the collision process.Focus on analyzing the effect comparison with/without limit block,pier height,the impact stiffness and damping parameters on the response of bridge structure,which considered collision effect between the girder and the limit block in longitudinal direction under the earthquake.After the longitudinal shear key is set,the bottom shear forces of transitional pier and the top displacements of transitional pier are increased,but the displacement between the top of transitional pier and girder is greatly reduced,which can prevent the occurrence of girder falling.The increase of the impact stiffness increases the bottom shear forces of pier and the top displacements of pier,while reducing the displacement of girder and the displacement between the top of pier and girder.For the analysis of similar size with this kind of bridge,the suitable value of collision stiffness is 10^8 N/m for the limit block in longitudinal direction is recommended,the collision damping of collision stiffness has little influence on the seismic response of the bridge,and it can not be specially considered in the design.

关 键 词：桥梁工程 纵向挡块 KELVIN模型 碰撞刚度 碰撞阻尼 墩高 参数分析 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]