Implications of seismic pounding on the longitudinal response of multi-span bridges-an analytical perspective

查看全文 作　　者：Reginald [1]DesRoches;Susendar [1]Muthukumar

机构地区：[1]Georgia Institute of Technology,School of Civil and Environmental Engineering

出　　处：《Earthquake Engineering and Engineering Vibration》索引2004年第3卷第1期,共9页

基　　金：Earthquake Engineering Research Centers Program of the National Science Foundation Under Award Number EEC-9701785(Mid-America Earthquake Center) 摘　　要：Seismic pounding between adjacent frames in multiple-frame bridges and girder ends in multi-span simply supported bridges has been commonly observed in several recent earthquakes. The consequences of pounding include damage to piers, abutments, shear keys, bearings and restrainers, and possible collapse of deck spans. This paper investigates pounding in bridges from an analytical perspective. A simplified nonlinear model of a multiple-frame bridge is developed including the effects of inelastic frame action and nonlinear hinge behavior, to study the seismic response to longitudinal ground motion. Pounding is implemented using the contact force-based Kelvin model, as well as the momentum-based stereomechanical approach, Parameter studies are conducted to determine the effects of frame period ratio, column hysteretic behavior, energy dissipation during impact and near source ground motions on the pounding response of the bridge. The results indicate that pounding is most critical for highly out-of-phase frames and is not significant for frame period ratios greater than 0.7. Impact models without energy dissipation overestimate the displacement and acceleration amplifications due to impact, especially for elastic behavior of the frames. Representation of stiffness degradation in bridge columns is essential in capturing the accurate response of pounding frames subjected to far field ground motion. Finally, it is shown that strength degradation and pounding can result in significant damage to the stiffer frames of the bridge when subjected to large acceleration pulses from near field ground motion records. 关键词：地震响应多重结构桥梁大跨度地震损伤

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Implications of seismic pounding on the longitudinal response of multi-span bridges-an analytical perspective

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