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

Earthquake Engineering and Engineering Vibration 2004年第1期3卷 57-65页

作者： Reginald DesRoches Susendar Muthukumar Georgia Institute of Technology School of Civil and Environmental Engineering

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 *** consequences of pounding include damage to piers,abutments,shear keys,bearings and restrainers,and possible collapse of deck *** 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 *** is implemented using the contact force-based Kelvin model,as well as the momentum-based stereomechanical *** 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 *** results indicate that pounding is most critical for highly out-of-phase frames and is not significant for frame period ratios greater than *** models without energy dissipation overestimate the displacement and acceleration amplifications due to impact,especially for elastic behavior of the *** of stiffness degradation in bridge columns is essential in capturing the accurate response of pounding frames subjected to far field ground ***,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： seismic pounding adjacent structures contact element method stereomechanical approach multiple-frame bridge nonlinear hinge behavior

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