Seismic assessment of existing r.c. framed structures with in-plan irregularity by nonlinear static methods

This paper evaluates the effectiveness of three nonlinear static methods for the prediction of the dynamic response of in-plan irregular buildings. The methods considered are the method suggested in Eurocode 8, a method previously proposed by some of the authors and based on corrective eccentricities and a new method in which two pushover analyses are considered, one with lateral forces applied to the centres of mass of the floors and the other with only translational response. The numerical analyses are carried out on a set of refined models of reinforced concrete framed buildings. The response predicted by the nonlinear static analyses is compared to that provided by nonlinear dynamic analyses. The effectiveness of the nonlinear static methods is evaluated in terms of absolute and interstorey displacements.

[1]  Sashi K. Kunnath,et al.  Seismic Performance and Retrofit Evaluation of Reinforced Concrete Structures , 1997 .

[2]  James O. Jirsa,et al.  Behavior of concrete under compressive loadings , 1969 .

[3]  Rui Pinho,et al.  Using nonlinear static procedures for seismic assessment of the 3D irregular SPEAR building , 2010 .

[4]  Aurelio Ghersi,et al.  Static versus modal analysis: influence on inelastic response of multi-storey asymmetric buildings , 2007 .

[5]  Aurelio Ghersi,et al.  On the evaluation of seismic response of structures by nonlinear static methods , 2009 .

[6]  Peter Fajfar,et al.  Capacity spectrum method based on inelastic demand spectra , 1999 .

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

[8]  Tomaso Trombetti,et al.  Physically-based prediction of the maximum corner displacement magnification of one-storey eccentric systems , 2013, Bulletin of Earthquake Engineering.

[9]  Aurelio Ghersi,et al.  Corrective Eccentricities for the Evaluation of the Seismic Response of One-Storey Asymmetric Systems by Nonlinear Static Analysis , 2009 .

[10]  J. Mander,et al.  Theoretical stress strain model for confined concrete , 1988 .

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

[12]  George K. Georgoussis,et al.  Modal rigidity center: it\'s use for assessing elastic torsion in asymmetric buildings , 2010 .

[13]  M. Menegotto.  Method of Analysis for Cyclically Loaded R. C. Plane Frames Including Changes in Geometry and Non-Elastic Behavior of Elements under Combined Normal Force and Bending , 1973 .

[14]  Michael H. Scott,et al.  Krylov Subspace Accelerated Newton Algorithm: Application to Dynamic Progressive Collapse Simulation of Frames , 2010 .

[15]  Zila Rinaldi,et al.  Static vs. Modal Analysis of Asymmetric Buildings: Effectiveness of Dynamic Eccentricity Formulations , 2002 .

[16]  M. De Stefano,et al.  Effect of the variability in plan of concrete mechanical properties on the seismic response of existing RC framed structures , 2012, Bulletin of Earthquake Engineering.

[17]  Mario De Stefano,et al.  Effect of Overstrength on the Seismic Behaviour of Multi-Storey Regularly Asymmetric Buildings , 2006 .

[18]  Peter Fajfar,et al.  THE N2 METHOD FOR THE SEISMIC DAMAGE ANALYSIS OF RC BUILDINGS , 1996 .

[19]  Triantafyllos Makarios.  Practical calculation of the torsional stiffness radius of multistorey tall buildings , 2008 .

[20]  Iztok Peruš,et al.  TORSIONAL EFFECTS IN THE PUSHOVER-BASED SEISMIC ANALYSIS OF BUILDINGS , 2005 .

[21]  Stavros A. Anagnostopoulos,et al.  An answer to an important controversy and the need for caution when using simple models to predict inelastic earthquake response of buildings with torsion , 2009 .

[22]  Stavros A. Anagnostopoulos,et al.  Inelastic torsion of multistorey buildings under earthquake excitations , 2005 .

[23]  E. Marino,et al.  Exact evaluation of the location of the optimum torsion axis , 2004 .

[24]  Roberto Scotta,et al.  Validation and improvement of N1 method for pushover analysis , 2013 .

[25]  Pier Paolo Rossi,et al.  An analytical method for the evaluation of the in-plan irregularity of non-regularly asymmetric buildings , 2013, Bulletin of Earthquake Engineering.

[26]  Kenji Fujii,et al.  Nonlinear Static Procedure for Multi-Story Asymmetric Frame Buildings Considering Bi-Directional Excitation , 2011 .

[27]  Aurelio Ghersi,et al.  Corrective eccentricities for assessment by the nonlinear static method of 3D structures subjected to bidirectional ground motions , 2012 .

[28]  Asimina Athanatopoulou,et al.  Invariant torsion properties of multistorey asymmetric buildings , 2008 .

[29]  Marco Tanganelli,et al.  Variability in concrete mechanical properties as a source of in-plan irregularity for existing RC framed structures , 2014 .

[30]  Anil K. Chopra,et al.  A modal pushover analysis procedure to estimate seismic demands for unsymmetric‐plan buildings , 2004 .

[31]  Stavros A. Anagnostopoulos,et al.  Inelastic earthquake response of single‐story asymmetric buildings: an assessment of simplified shear‐beam models , 2003 .

[32]  Pier Paolo Rossi,et al.  An accurate strength amplification factor for the design of SDOF systems with P–Δ effects , 2014 .

[33]  Triantafyllos Makarios,et al.  Real and fictitious elastic axes of multi‐storey buildings: applications , 1998 .

[34]  Federico M. Mazzolani,et al.  Numerical and experimental behaviour of a full-scale RC structure upgraded with steel and aluminium shear panels , 2010 .

[35]  W. K. Tso,et al.  EXTENSION OF EUROCODE 8 TORSIONAL PROVISIONS TO MULTI-STOREY BUILDINGS , 2000 .

[36]  Kenji Fujii,et al.  Prediction of the largest peak nonlinear seismic response of asymmetric buildings under bi-directional excitation using pushover analyses , 2014, Bulletin of Earthquake Engineering.

[37]  Aurelio Ghersi,et al.  Comparison of nonlinear static methods for the assessment of asymmetric buildings , 2013, Bulletin of Earthquake Engineering.

[38]  Sashi K. Kunnath,et al.  Adaptive Spectra-Based Pushover Procedure for Seismic Evaluation of Structures , 2000 .

[39]  T. Makarios,et al.  Real and fictitious elastic axes of multi-storey buildings: theory , 1998 .

[40]  Aurelio Ghersi,et al.  Application of Nonlinear Static Method with Corrective Eccentricities to Multistorey Buildings: A Case Study , 2013 .

[41]  Peter Fajfar,et al.  The extended N2 method considering higher mode effects in both plan and elevation , 2012, Bulletin of Earthquake Engineering.