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Sidesway collapse capacity of the bottom-story-stiffness-irregular moment-resisting frames
Abstract This paper proposes a new procedure to estimate the seismic sidesway collapse capacity of the frame structures including the stiffness irregularity effects at the first (bottom) story. The presented method is based on the pushover analysis procedure and is easy to use. A large number of generic structures with various structural characteristics are developed to simulate the seismic collapse response of the frames. In this study, a comprehensive databank of the seismic demands for the generic structures is first developed by using the Incremental Dynamic Analysis (IDA) and pushover analysis procedures. A simple equation is then presented to estimate the seismic sidesway collapse capacity of the frame structures using multivariate linear regression analysis. After examining different multivariate regression models, a logarithmic equation is proposed to connect the collapse capacities predicted by the exact IDA procedure to the structural parameters derived from an idealized capacity curve. The proposed method is verified by analyzing 45 example frames and comparing its collapse capacities with those given by the exact IDA approach. The results clearly show that the proposed procedure is reliable and can predict the seismic collapse capacity of the regular and the first-story stiffness-irregular frames with sufficient accuracy.
Highlights The seismic collapse capacity of the regular and first-story stiffness-irregular moment-resisting frames is assessed. A simple formula is proposed to estimate the median seismic collapse capacity. The proposed method provides sufficient accurate estimates of the collapse capacity.
Sidesway collapse capacity of the bottom-story-stiffness-irregular moment-resisting frames
Abstract This paper proposes a new procedure to estimate the seismic sidesway collapse capacity of the frame structures including the stiffness irregularity effects at the first (bottom) story. The presented method is based on the pushover analysis procedure and is easy to use. A large number of generic structures with various structural characteristics are developed to simulate the seismic collapse response of the frames. In this study, a comprehensive databank of the seismic demands for the generic structures is first developed by using the Incremental Dynamic Analysis (IDA) and pushover analysis procedures. A simple equation is then presented to estimate the seismic sidesway collapse capacity of the frame structures using multivariate linear regression analysis. After examining different multivariate regression models, a logarithmic equation is proposed to connect the collapse capacities predicted by the exact IDA procedure to the structural parameters derived from an idealized capacity curve. The proposed method is verified by analyzing 45 example frames and comparing its collapse capacities with those given by the exact IDA approach. The results clearly show that the proposed procedure is reliable and can predict the seismic collapse capacity of the regular and the first-story stiffness-irregular frames with sufficient accuracy.
Highlights The seismic collapse capacity of the regular and first-story stiffness-irregular moment-resisting frames is assessed. A simple formula is proposed to estimate the median seismic collapse capacity. The proposed method provides sufficient accurate estimates of the collapse capacity.
Sidesway collapse capacity of the bottom-story-stiffness-irregular moment-resisting frames
Jalilkhani, Maysam (author) / Beygmohamadi, Mohamadreza (author)
2021-12-10
Article (Journal)
Electronic Resource
English
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