Comparison of conventional and modal pushover Analysis of buildings
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Date
2012-03
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Addis Ababa University
Abstract
After revealing the deficiencies of Conventional Pushover Analysis (CPA) method for
structures with significant higher modes, Modal Pushover Analysis (MPA) procedures is
proposed to overcome this limitation. This study primarily evaluates the effectiveness of MPA
compared to conventional pushover analysis in predicting structural response of low and
medium rise reinforced concrete buildings, designed as fully ductile moment resisting frame
based on the Ethiopian building code. In addition, the values from MPA are compared to that of
the Response Spectrum Analysis (RSA) method for better understanding of the methods. For
the analysis of the buildings the analytical nonlinear modeling of structural elements are
considered which includes failure modes in flexure and shear by the software SAP2000.
The results obtained from MPA are compared to CPA and RSA methods. It is shown that
higher results of the story shear, story displacement and inter-story drift ratio can be predicted
by the MPA than CPA method. The RSA method generally underestimates the story
displacement and inter-story drift ratio as compared to MPA.
KEYWORDS: Modal Pushover Analysis (MPA), higher mode effect, ductile moment resisting
RC frame, Conventional Pushover Analysis (CPA), Response Spectrum Analysis (RSA),
Seismic Performance Evaluation
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Keywords
Modal Pushover Analysis (MPA); higher mode effect; ductile moment resisting RC frame; Conventional Pushover Analysis (CPA); Response Spectrum Analysis (RSA); Seismic Performance Evaluation