4899

4602

كارشناسي ارشد

سازه

اصفهان: دانشگاه صنعتي اصفهان، دانشكده عمران

1388

يازده، 138ص: مصور،جدول، نمودار

ص.ع. به: فارسي و انگليسي

مرتضي مدح خوان

بيژن برومند

16/10/88

علي حيدري، محمد مهدي سعادت پور

مهندسي عمران

ID4602

به فارسي و انگليسي: قابل رويت در نسخه ديجيتال

Study on Influence of Earthquake Time Representation on Seismic Response of SDOF Structures by Wavelet Transform Mehdi Kolahdouzan m kolahdouzan@cv iut ac ir May 2009 Department of Civil Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language Farsi Supervisor Dr M Madhkhan madhkhan@cc iut ac irAbstract Approximating earthquake records by stationary wavelet transform SWT is major work inthis thesis Approximation was done by a proposed technique which is based on selecting waveletcoefficients regard to their energy and dynamic property of structure The main property of thisnew method is the huge similarity of some structural responses to original and approximatedrecords when the time representation of these two types of records are very different In this way Eighteen approximated records was generated for a structure and one original record by eighteenapproximation patterns We also investigated the influence of earthquake record timerepresentation on structural responses Actually we choose one of these records which hasminimum correlation with original record and high similarity of structural response to original andthis approximated record bigger than a threshold By changing dynamic property of structures their effect on dependency of response to record shape was studied We also studied the influenceof arias intensity and peak ground acceleration on dependency of responses to time representationof earthquake records In this thesis 45600 linear and nonlinear analysis were done for threeoriginal record Eighteen approximated records 400 structure with 40 different periods and 10combination of dynamic property The main results of this study are that earthquake time representation peak groundacceleration and arias intensity has minor no effect on seismic behavior of single degree offreedom structures Effect of dynamic property of structures on dependency of response to recordshape are vary by record and structural period It is shown that post to pre yield stiffness ratio hasno effect on structural response dependency to record shape Key Words Earthquake Time Representation approximated record Stationary Wavelet Transform SWT Seismic Responses

مرتضي مدح خوان

بيژن برومند

علي حيدري، محمد مهدي سعادت پور