A modal shear-based pushover procedure for estimating the seismic demands of tall building structures. Issue 92 (January 2017)

• Record Type: Journal Article
• Authors: Vafaee, Mohammad Hossein; Saffari, Hamed
• Is Part Of: Soil dynamics and earthquake engineering. Issue 92(2017)
• Page Start: 95
• Page End: 108
• Publication Date: 2017-01
• Subjects: Non-linear static procedure -- Vibration mode -- Modal shear distribution -- Non-linear response history analysis -- Seismic demands prediction; Soil dynamics -- Periodicals; Earthquake engineering -- Periodicals; Sols -- Dynamique -- Périodiques; Génie parasismique -- Périodiques; 624.176205
• DOI: 10.1016/j.soildyn.2016.09.033
• Languages: English
• ISSNs: 0267-7261

Abstract

Abstract: Non-linear static procedure (NSP) has been considered as a popular method to predict seismic force and deformation demands for performance evaluation of the structures, in recent years. However, this evaluation tool is restricted to low-rise and regular buildings in which the fundamental vibration mode dominates the structural behavior. Recently, some advanced procedures have been presented to oversee these conventional procedure deficiencies. In the current study, a new nonlinear static procedure considering the effects of higher modes in structural responses is presented. This approach assigns a contribution factor for each mode based on modal shear distribution. The offered contribution factor can be applied for determining the importance of each mode in lateral load pattern formation. In order to verify the results, some other types of pushover-based analysis are also performed and the responses obtained from each NSP are compared with those of rigorous non-linear response history analysis (NL-RHA). Results demonstrated the efficiency of the proposed method in accurate prediction of the seismic demands of high-rise buildings. Highlights: A modal shear-based pushover procedure is proposed to predict demands of buildings. The presented procedure takes into account the higher mode effects. The sign effects in the higher modes are reflected using the proposed procedure. The proposed method provides accurate responses for considered structural models.