Techno Press
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Structural Engineering and Mechanics   Volume 47, Number 1, July10 2013, pages 119-129
Optimization of modal load pattern for pushover analysis of building structures
Mohsen Ali Shayanfar, Mansoor Ashoory, Taha Bakhshpoori and Basir Farhadi

Abstract     [Full Text]
    Nonlinear Static Procedures (NSPs) have been developed as a practical tool to estimate the seismic demand of structures. Several researches have accomplished to minimize errors of NSPs, namely pushover procedures, in the Nonlinear Time History Analysis (NTHA), as the most exact method. The most important issue in a typical pushover procedure is the pattern and technique of loading which are extracted based on structural dynamic fundamentals. In this paper, the coefficients of modal force combination is focused involving a meta-heuristic optimization algorithm to find the optimum load pattern which results in a response with minimum amount of errors in comparison to the NTHA counterpart. Other parameters of the problem are based on the FEMA recommendations for pushover analysis of building structures. The proposed approach is implemented on a high-rise 20 storey concrete moment resisting frame under three earthquake records. In order to demonstrate the effectiveness and robustness of the studied procedure the results are presented beside other well-known pushover methods such as MPA and the FEMA procedures, and the results show the efficiency of the proposed load patterns.
Key Words
    nonlinear static analysis; pushover; optimization; seismic demand; concrete frame
Mohsen Ali Shayanfar, Mansoor Ashoory, Taha Bakhshpoori and Basir Farhadi : Centre of Excellence for Fundamental Studies in Structural Engineering, Iran University of Science and Technology, Narmak, Tehran 16, Iran

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