竖向地震作用下桥梁碰撞响应的动态子结构方法  

Dynamic substructure technique for pounding response of bridge under vertical earthquake

作　　者：王文[1] 尹晓春[1] 杨海波[1] 徐然[2] 

机构地区：[1]南京理工大学理学院,江苏南京210094 [2]常州大学机械学院,江苏常州213016

出　　处：《南京理工大学学报》2014年第2期187-191,共5页Journal of Nanjing University of Science and Technology

基　　金：国家自然科学基金(11372138);高等学校博士学科点专项科研基金(20123219110036);总装预研重点项目

摘　　要：该文研究了竖向地震作用下桥梁结构的碰撞响应问题。考虑多次碰撞和多次分离过程以及桥梁支座的影响,针对多跨连续桥梁建立动态子结构模型,导出了模态坐标表示的碰撞动力学方程,并将动态子结构方法应用于竖向地震作用下桥梁结构的碰撞响应问题。采用Newmark隐式积分法对动力学控制方程进行数值求解,研究了竖向地震作用下桥梁与桥墩的碰撞动力学响应。数值收敛性结果和理论解的对比分析表明,该动态子结构方法具有良好的数值收敛性和较高的计算精度,可有效地分析竖向地震作用下桥梁的碰撞响应。To study the pounding dynamic responses of bridges under vertical earthquakes,a dynamic substructure method is presented here. Considering the multiple impact process and the multiple separation process and the effect of the bridge bearing,the dynamic substructure models of bridges are built and the pounding dynamic governing equations are derived in the modal coordinate system. The Newmark implicit integration method is applied to solve the dynamic governing equations numerically. The pounding dynamic process of the deck against the pier under vertical earthquakes and the pounding force and impulse are simulated. The numerical convergence results and their comparisonwith the theoretical solution show that the present dynamic substructure method is convergent in numerical calculation and has high numerical precision,and it is suitable for the numerical simulations of pounding responses of bridges under vertical earthquakes.

关 键 词：动态子结构方法 桥梁 竖向地震 碰撞 响应 

分 类 号：U442.5[建筑科学—桥梁与隧道工程] O313.4[交通运输工程—道路与铁道工程]