Simplified multimodal pushover target acceleration method for seismic resistance analysis of medium-rise RC structures

This paper presents a simplified target acceleration method, which is a new modification of the multimodal pushover method. Target acceleration is defined as the minimum acceleration of a base that leads to the ultimate limit state of a structure, presenting thus the lowest seismic resistance of the structure. Target acceleration is achieved by an iterative procedure, using a nonlinear numerical model of stability and load-bearing capacity of RC structures. A multimodal pushover analysis was performed for a linear combination of modes. The simplified target acceleration method is exemplified on two medium-rise RC frame structures. The influence of higher modes, particularly of the second one, has proven very significant. Validation of presented simplified target acceleration method was conducted through an incremental dynamic analysis. A comparison between the target acceleration obtained from the simplified target acceleration method and the failure peak ground acceleration obtained from the dynamic response of the structure exhibits very good agreement. The presented results demonstrate the ability of the simplified multimodal pushover target acceleration method to reliably assess the lowest seismic resistance of medium-rise RC structures.

[1]  Ante Mihanović,et al.  Target acceleration method for analysis of RC structures , 2015 .

[2]  Nabiollah Alirahimi Kashkooli,et al.  Effect of frame irregularity on accuracy of modal equivalent nonlinear static seismic analysis , 2013 .

[3]  Sashi K. Kunnath,et al.  Adaptive Modal Combination Procedure for Nonlinear Static Analysis of Building Structures , 2006 .

[4]  Anil K. Chopra,et al.  Dynamics of Structures: Theory and Applications to Earthquake Engineering , 1995 .

[5]  Ante Mihanović,et al.  Multimodal Pushover Target Acceleration Method Versus Dynamic Response of R/C Frames , 2013 .

[6]  M. Selim Günay,et al.  Generalized force vectors for multi‐mode pushover analysis , 2011 .

[7]  Sashi K. Kunnath,et al.  Assessment of current nonlinear static procedures for seismic evaluation of buildings , 2007 .

[8]  Peter Fajfar,et al.  A Nonlinear Analysis Method for Performance-Based Seismic Design , 2000 .

[9]  Simon Kim,et al.  Push-over Analysis Procedure in Earthquake Engineering , 1999 .

[10]  Anil K. Chopra,et al.  A modal pushover analysis procedure for estimating seismic demands for buildings , 2002 .

[11]  Sashi K. Kunnath,et al.  Identification of Modal Combinations for Nonlinear Static Analysis of Building Structures , 2004 .

[12]  Faramarz Khoshnoudian,et al.  The extended consecutive modal pushover procedure for estimating the seismic demands of two-way unsymmetric-plan tall buildings under influence of two horizontal components of ground motions , 2014 .

[13]  Ioannis N. Psycharis,et al.  Effect of higher modes on the seismic response and design of moment-resisting RC frame structures , 2013 .

[14]  Dimitrios Vamvatsikos,et al.  Incremental dynamic analysis , 2002 .

[15]  C. J. Athanassiadou.  Seismic performance of R/C plane frames irregular in elevation , 2008 .

[16]  Mehmed Causevic,et al.  Comparison between non-linear dynamic and static seismic analysis of structures according to European and US provisions , 2011 .

[17]  Anil K. Chopra,et al.  Evaluation of a Modified MPA Procedure Assuming Higher Modes as Elastic to Estimate Seismic Demands , 2004 .

[18]  Nikos D. Lagaros,et al.  Evaluation of ASCE-41, ATC-40 and N2 static pushover methods based on optimally designed buildings , 2011 .

[19]  Anil K. Chopra,et al.  Role of Higher-“Mode” Pushover Analyses in Seismic Analysis of Buildings , 2005 .

[20]  Amr S. Elnashai,et al.  Static pushover versus dynamic collapse analysis of RC buildings , 2001 .

[21]  Belgasmia Mourad,et al.  Comparison between static nonlinear and time history analysis using flexibility-based model for an existing structure and effect of taking into account soil using Domain Reduction Method for a single media , 2015 .

[22]  Giuseppe Maddaloni,et al.  Comparison between non-linear dynamic analysis performed according to EC8 and elastic and non-linear static analyses , 2007 .

[23]  Ante Mihanović,et al.  The comparative body model in material and geometric nonlinear analysis of space R/C frames , 2008 .

[24]  S. F. Ghahari,et al.  Studying higher mode effects on the performance of nonlinear static analysis methods considering near-fault effects , 2013 .