Development of a Nonlinear SI Scheme using Measured Acceleration Increment

측정 가속도 증분을 사용한 비선형 SI 기법의 개발

  • 신수봉 (인하대학교 토목공학과) ;
  • 오성호 ((주)대본엔지니어링 구조팀) ;
  • 최광규 (동아대학교 토목공학과)
  • Published : 2004.12.01


A nonlinear time-domain system identification algorithm using measured acceleration data is developed for structural damage assessment. To take account of nonlinear behavior of structural systems, an output error between measured and computed acceleration increments has been defined and a constrained nonlinear optimization problem is solved for optimal structural parameters. The algorithm estimates time-varying properties of stiffness and damping parameters. Nonlinear response of restoring force of a structural system is recovered by using the estimated time-varying structural properties and computed displacement by Newmark-$\beta$ method. In the recovery, no pre-defined model for inelastic behavior has been assumed. In developing the algorithm, noise and incomplete measurement in space and state have been considered. To examine the developed algorithm, numerical simulation and laboratory experimental studies on a three-story shear building have been carried out.


nonlinear time-domain SI;output error;acceleration increment;restoring force;noise;incomplete measurement


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