Evaluation of seismic vulnerability of a complex RC existing building by linear and nonlinear modeling approaches

Recent earthquakes, that stroked Italian regions in past decades (Umbria— Marche 1997; Molise 2002; L’Aquila 2009), pointed out the high vulnerability of reinforced concrete existing buildings causing severe damages in the structures and consequently life losses. This is mainly due to the fact that such structures were often built without reference to seismic actions or on the basis of old standard provisions. Nowadays in Italy, Public Authorities are requested to evaluate the seismic vulnerability of their building stock assessing the actual capacity of such structures, as a consequence of new hazard levels and seismic microzonation introduced by new standards. According to Eurocode 8 or Italian standard NTC 2008, the seismic analysis of existing reinforced concrete buildings can be performed by one of the established procedure (i.e. Linear Static Analysis LSA, Linear Dynamic Analysis LDA, Nonlinear Static Analysis NSA, Nonlinear Dynamic Analysis NDA), depending on the achieved knowledge level about the structural system and materials. In order to compare efficiency and differences of previously described approaches, a deep investigation was executed on a reinforced concrete existing building whose dynamic behaviour was evaluated by an experimental dynamic analysis. In such a way, updated models were obtained and adopted for seismic analysis performed by using linear and nonlinear approaches, taking into account the stiffness and strength contribution of masonry infill walls. It was so possible to get useful indications on the reliability and discrepancies of different modelling approaches as well as on the influence of masonry infills on the seismic response of existing r.c. buildings.

[1]  Gaetano Manfredi,et al.  A new strategy for the seismic assessment of existing RC buildings , 2002 .

[2]  Hong Hao,et al.  Civil structure condition assessment by FE model updating: methodology and case studies , 2001 .

[3]  Gennaro Magliulo,et al.  Non-linear Methods for Seismic Assessment of Existing Structures: A Comparative Study on Italian RC Buildings , 2008 .

[4]  Paolo Bazzurro,et al.  Performance of Reinforced Concrete Buildings during the 2002 Molise, Italy, Earthquake , 2004 .

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

[6]  Peter Fajfar,et al.  Seismic evaluation of an existing complex RC building , 2010 .

[7]  Herman Van der Auweraer,et al.  Operational PolyMAX for estimating the dynamic properties of a stadium structure during a football game , 2004 .

[8]  Angelo Masi,et al.  Seismic Vulnerability Assessment of Gravity Load Designed R/C Frames , 2003 .

[9]  Aníbal Costa,et al.  A comparative application of different EC8-3 procedures for the seismic safety assessment of existing structures , 2010 .

[10]  T. Paulay,et al.  Seismic Design of Reinforced Concrete and Masonry Buildings , 1992 .

[11]  Mauro Dolcea,et al.  Vulnerability assessment and earthquake damage scenarios of the bu stock of Potenza ( Southern Italy ) using Italian and Greek methodolog , 2005 .

[12]  Angelo Masi,et al.  Prestazioni delle tamponature e tramezzature negli edifici in c.a.: implicazioni progettuali e costruttive alla luce dell’esperienza del terremoto dell’Abruzzo 2009 , 2010 .

[13]  Lorenza Petrini,et al.  A Critical Review of the R.C. Frame Existing Building Assessment Procedure According to Eurocode 8 and Italian Seismic Code , 2008 .

[14]  Vitelmo V. Bertero,et al.  Earthquake Resistance of Infilled Frames , 1978 .

[15]  A Goretti,et al.  EMPIRICAL FRAGILITY FUNCTIONS FROM DAMAGE SURVEYS AND ESTIMATED STRONG GROUND MOTION , 1998 .

[16]  F. Crisafulli.  Seismic behaviour of reinforced concrete structures with masonry infills , 1997 .

[17]  Mohammad Reza Manshoori,et al.  Evaluation of Seismic Vulnerability and Failure Modes for Pipelines , 2011 .

[18]  Mohsen A. Issa,et al.  Behavior of masonry-infilled nonductile reinforced concrete frames , 2002 .

[19]  Michael N. Fardis,et al.  Seismic Design, Assessment and Retrofitting of Concrete Buildings , 2009 .

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

[21]  Gerardo M. Verderame,et al.  Ultimate chord rotation of RC columns with smooth bars: some considerations about EC8 prescriptions , 2010 .

[22]  Katya Scheinberg,et al.  Introduction to derivative-free optimization , 2010, Math. Comput..

[23]  John E. Mottershead,et al.  Finite Element Model Updating in Structural Dynamics , 1995 .

[24]  Jiyun Lee,et al.  Methodology and Case Studies of Signal-in-Space Error Calculation Top-down Meets Bottom-up , 2009 .

[25]  Durgesh C. Rai,et al.  Code Approaches to Seismic Design of Masonry-Infilled Reinforced ConcreteFrames: A State-of-the-Art Review , 2006 .

[26]  Randall J. Allemang,et al.  THE MODAL ASSURANCE CRITERION–TWENTY YEARS OF USE AND ABUSE , 2003 .

[27]  E. Smyrou,et al.  Implementation and verification of a masonry panel model for nonlinear dynamic analysis of infilled RC frames , 2011 .

[28]  P. Guillaume,et al.  Operational modal analysis for estimating the dynamic properties of a stadium structure during a football game , 2007 .

[29]  A. Kappos,et al.  Vulnerability assessment and earthquake damage scenarios of the building stock of Potenza (Southern Italy) using Italian and Greek methodologies , 2006 .

[30]  Angelo Masi,et al.  Performance of non-structural elements in RC buildings during the L’Aquila, 2009 earthquake , 2011 .

[31]  Matjaž Dolšek,et al.  The effect of masonry infills on the seismic response of a four-storey reinforced concrete frame — a deterministic assessment , 2008 .

[32]  Aníbal Costa,et al.  Practical aspects of demand and capacity evaluation of RC members in the context of EC8-3 , 2009 .

[33]  Guido Magenes,et al.  DEVELOPMENT OF SEISMIC VULNERABILITY ASSESSMENT METHODOLOGIES OVER THE PAST 30 YEARS , 2006 .

[34]  Gian Michele Calvi,et al.  A study on damage scenarios for residential buildings in Catania city , 1999 .

[35]  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 .

[36]  Andrei M. Reinhorn,et al.  Modeling of Masonry Infill Panels for Structural Analysis , 1995 .