Accuracy Investigation of CSM-DAP Method in Comparison with FEMA356 Method for Estimating Seismic Demands of Steel Moment Resisting Frames with Geometric Irregularity in Elevation

Document Type : Research Article

Authors

1 Civil and Environmental Engineering Dept., Shiraz University, Shiraz, Iran

2 Department of Civil Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran

Abstract

Estimating seismic demands of structures has acquired renewed importance as a result of recent interests in performance-based seismic design. Consequently, in recent years, different equivalent nonlinear static analysis procedures have been developed to estimate structural seismic demands. However, just a few studies have been conducted to examine the accuracy and adequacy of these developed methods. Thus, it is necessary to conduct thorough investigations of these methods’ limitations, possible shortcomings, and their performance. In this paper, the accuracy of the CSM-DAP method in comparison with the FEMA356 method was evaluated for estimating seismic demands of low- rise steel moment resisting frames with geometric irregularity in elevation. The CSM-DAP method is an equivalent displacement-based adaptive nonlinear static analysis method combined with the FEMA440 capacity spectrum method. The CSM-DAP and FEMA356 methods were used to analyze 44 five-story moment-resisting frames subjected to 14 far-field earthquake ground motions and their results were compared with the results of nonlinear dynamic analyses. The selected sample includes a wide range  of geometric irregularities in elevation for low-rise structures. The estimated demand responses were namely roof displacement, inter-story drift ratio, and base shear. This study showed that considering the CSM-DAP computational effort, this method did not present significant advantages with respect to the FEMA356 method at least for low-rise structures with geometric irregularity in elevation.

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References

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Amirkabir Journal of Civil Engineering
Volume 52, Issue 1
April 2020
Pages 3-20

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