Design for Lateral Loads/Systems

Single Abstract

342935 - Tall building response comparison - use of Time domain scaling Vs Spectral matching input ground motion

Friday, April 20
11:00 AM - 12:30 PM
Location: 204AB

While performing non-linear response history analyses of tall buildings, designers and researchers come across some crucial modeling questions. Use of appropriately selected and scaled ground motion is one of them. Once appropriate ground motions are selected, the big question become: how these ground motion time histories be modified to be compatible with the design target acceleration response spectrum. Modification can be performed in two ways: (a) direct time domain scaling of the acceleration time-histories of the ground motions, and (b) transforming the time-acceleration data into the frequency domain, making adjustments (to be compatible with the target spectrum) and transforming back into the time domain. Both the methods are mentioned in Guidelines for Performance-based Seismic Design of Tall Buildings (PEER 2010/05) and FEMA P-1050-1/2105 Edition. ASCE 7-10 mentioned the direct scaling approach but did not mention the other method explicitly. The objective of this paper is to determine the extent of differences in response of tall buildings using both time domain scaled and frequency domain adjusted ground motions. For this purpose, several example structures were selected to be analyzed. They are: (a) 42-story concrete dual core wall-frame structure, and (b) 40-story steel space frame structure, etc. Detailed non-linear model of these structures were developed in PERFORM-3D. Seven-sets of appropriate ground motions were selected for the non-linear time history analyses. Results from analyses show differences in response of these buildings using time domain scaled and spectral matching input ground motions.

Mohammad Bhuiyan

Assistant Professor
West Virginia State University

MOHAMMAD T BHUIYAN, PhD, is an Assistant Professor of Civil Engineering at West Virginia State University (WVSU). He earned his B.Sc in Civil Engineering from Bangladesh University of Engineering & Technology, Dhaka; an M.Sc in Earthquake Engineering jointly from Universite Joseph Fourier, France and ROSE School, Italy; and a Ph.D in Earthquake Engineering from ROSE School with joint program at Georgia Tech, Atlanta. His research interest are in Tall building, Earthquake engineering, soil-structure interaction, etc. Dr. Bhuiayn may be reached at towhid@wvstateu.edu.

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342935 - Tall building response comparison - use of Time domain scaling Vs Spectral matching input ground motion



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