Capacity Spectrum Method Based on Inelastic Displacement Ratio
Sang Whan Han,Mun-Su Bae +1 more
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TL;DR: In this paper, an improved capacity spectrum method (CSM) is proposed for determining the maximum roof displacement using inelastic displacement ratio and R factor calculated from demand spectrum and capacity curve.
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Abstract: In this study, improved capacity spectrum method (CSM) is proposed. The method can account for higher mode contribution to the seismic response of MDOF systems. The CSM has been conveniently used for determining maximum roof displacement using both demand spectrum and capacity curve of equivalent SDOF system. Unlike the conventional CSM, the maximum roof displacement is determined without iteration using inelastic displacement ratio and R factor calculated from demand spectrum and capacity curve. Three moment resisting steel frames of 3-, 9- and 20-stories are considered to test the accuracy of the proposed method. Nonlinear response history analysis (NL-RHA) for three frames is also conducted, which is considered as an exact solution. SAC LA 10/50 and 2/50 sets of ground motions are used. Moreover, this study estimates maximum story drift ratios (IDR) using ATC-40 CSM and N2-method and compared with those from the proposed method and NL-RHA. It shows that the proposed CSM estimates the maximum IDR accurately better than the previous methods.
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Citations
Direct Displacement Based Design and Capacity Spectrum Method for Special Moment Resisting Frame
Anis Rosyidah,Politeknik Negeri Jakarta,A P Nadhila Ramadhani +2 more
- 30 Mar 2020
TL;DR: In this article, two methods of performance-based design, there are Direct Displacement-Based Design and Capacity Spectrum Method, by using pushover analysis, were used to analyze and compare performance level of the building in inelastic condition by using these two methods.
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References
A Nonlinear Analysis Method for Performance‐Based Seismic Design
TL;DR: In this article, a relatively simple nonlinear method for the seismic analysis of structures (the N2 method) is presented, which combines the pushover analysis of a multi-degree-of-freedom (MDOF) model with the response spectrum analysis of an equivalent single degree-offreedom (SDOF) system.
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Capacity spectrum method based on inelastic demand spectra
TL;DR: In this paper, the idea of using inelastic demand spectra within the capacity spectrum method has been elaborated and is presented in an easy to use format, which represents the so-called N2 method formulated in the format of the Capacity Spectrum method.
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Pros and cons of a pushover analysis of seismic performance evaluation
TL;DR: In this paper, the authors summarize basic concepts on which the pushover analysis can be based, assess the accuracy of pushover predictions, identify conditions under which pushover will provide adequate information and, perhaps more importantly, identify cases in which the prediction will be inadequate or even misleading.
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Estimation of Inelastic Deformation Demands of SDOF Systems
TL;DR: In this paper, two closely related approximate methods to estimate the maximum lateral inelastic deformations demands of single-degree-of-freedom (SDOF) systems subjected to earthquake ground motions are investigated.
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Evaluation of Modal and FEMA Pushover Analyses: SAC Buildings
Rakesh K. Goel,Anil K. Chopra +1 more
TL;DR: In this paper, the authors evaluated the performance of the Modal Pushover Analysis (MPA) procedure against the nonlinear response history analysis (RHA) and investigated the accuracy of seismic demands determined by pushover analysis using FEMA-356 force distributions; the MPA procedure contained several improvements over the original version presented in Chopra and Goel (2002).