碰撞效应对双层高架桥地震响应的影响  

Effects of Pounding on Seismic Response of Double-deck Viaducts

作　　者：刘营[1] 徐略勤[1] 腾杰[1] 刘津成 

机构地区：[1]重庆交通大学土木工程学院,重庆交通大学山区桥梁与隧道工程国家重点实验室培育基地,重庆400074

出　　处：《工程抗震与加固改造》2016年第2期121-127,共7页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金资助(51408089);交通运输部应用基础研究计划项目(2014319814210);重庆市基础与前沿研究计划项目(cstc2015jcyj A30014);山区桥梁与隧道工程国家重点实验室培育基地开放基金(CQSLBF-Y14-2)

摘　　要：针对双层高架桥在地震作用下主梁与墩柱之间的碰撞问题,采用Hertzdamp模型模拟碰撞效应,建立了纤维有限元分析模型。基于非线性时程分析法,对碰撞刚度、初始间隙、恢复系数进行了参数敏感性研究。结果表明:碰撞会增大墩柱的地震内力响应,显著增大墩底曲率反应;下墩柱中间附近和碰撞位置附近弯矩显著增加;初始间隙在1cm^10cm内取值时,碰撞效应对墩柱的不利影响最大,超过15cm时,碰撞几乎不发生;恢复系数对框架墩的剪力、弯矩、曲率影响都很小,可忽略。To investigate the pounding effect between lower decks and columns in double-deck viaducts,finite element analytical fiber models are established using the Hertzdamp formulation to model the pounding effect. Nonlinear time history method is applied to perform parametric sensitivity analyses to the impact stiffness,initial gap and restitution coefficient. The results show that the pounding tends to increase the seismic internal forces and the curvature response of lower columns,and to increase the moment response in the vicinities of the middle parts of the lower columns and the pounding locations. When the value of the initial gap is set in the range of 1 cm ～ 10 cm,the pounding produces a most disadvantageous effect on the seismic response of columns. And with the initial gap larger than 15 cm,the pounding is unlikely to occur. The restitution coefficient has little effect on the shear force,moment and curvature response of framed columns,and therefore can be negected.

关 键 词：双层高架桥 碰撞效应 Hertzdamp模型 地震响应 参数分析 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]