Seismic Behavior Analysis of the Bridge Retrofitted by Restrainer

Restrainer로 보강된 교량시스템의 지진거동분석

  • 김상효 (연세대학교 사회환경·건축공학과) ;
  • 마호성 (호서대학교 건축토목학부) ;
  • 이상우 (연세대학교 토목공학과) ;
  • 원정훈 (연세대학교 토목공학과)
  • Published : 2000.10.01


Dynamic responses of a bridge retrofitted with cable restrainers are examined under seismic excitations. A simplified and idealized mechanical model is developed to analyze the effects of the restrainers, which can consider the plastic behavior as well as the fracture of the cable. Using the proposed model, the effects of the stiffness and the clearance length of the restrainer upon the global bridge seismic behaviors are estimated. The changes of pounding forces, shear forces, and bending moments due to the application of restrainers are also investigated. The main effect of restrainers upon global bridge motions is found to reduce the relative distances between adjacent vibrations units. It is also found that the relative distances are decreased as the clearance length of the restrainer decreases and the stiffness of restrainer increases.