مقايسه ي روش هاي مختلف شناسايي سيستم با به كارگيري نگاشت هاي حاصل از آزمايش ارتعاش محيطي مدل 1/2 يك ساختمان فولادي 4 طبقه با اتصالات خورجيني

EVALUATING THE DIFFERENT SYSTEM IDENTIFICATION METHODS IN AMBIENT VIBRATION TEST OF A § SCALED STEEL STRUCTURE

Attract In this article, the ambient vibration test results of a | scaled model of a 4-story steel structure using ten CMG-6TD, three-component seismometers, have been represented. Four different signal processing methods, including: uMcVerrv, Four-Spectrum, Peak Picking and Stochastic Subspace Identificationʹʹ were used for modal parameter identification. The obtained dynamic param¬eters by the four mentioned methods were compared with the numerical modeling results and the ability of these methods was discussed. Totally, the damping val¬ues evaluated by the Stochastic Subspace Identification and Four-spectrum Methods are more accurate. Besides, the first 4 mode shapes of the model were identified more accurately by Four-Spectrum and McVerry methods. In order to generalize the results to other structures, com¬plementary studies on both in-situ dynamic tests and numerical modeling are needed