An Engineering Solution to Improve Post-Earthquake Fire Resistance in Important Reinforced Concrete Structures

An investigation based on sequential analysis is performed here on the Immediate Occupancy performance level of important structures designed to the ACI 318–08 code after they are subjected to earthquake level with PGA of 0.30 g. This is followed by a fire analysis of the damaged structure, from which the time it takes for the damaged structure to collapse is calculated. As a benchmark, the fire analysis is also performed for the undamaged structure and before the occurrence of earthquake. The results indicate that the vulnerability of structures increases when a previously damaged structure is exposed to fire. A post-earthquake fire (PEF) factor as a function of the required fire resistance time is then proposed to improve the fire resistance of important buildings subjected to PEF. Whilst the investigation is for a certain class of structures (important building, intermediate reinforced structure, 5 stories) and the results can only be expected to be applicable to the cases investigated, it is hoped that it paves the way for further research into this important phenomenon.

[1]  Venkatesh Kodur,et al.  Modeling the fire response of reinforced concrete columns under biaxial bending , 2010 .

[2]  Martin Gillie,et al.  Thermal Diffusivity of Tensile Cracked Concrete , 2011 .

[3]  Kristian Dahl Hertz,et al.  Limits of spalling of fire-exposed concrete , 2003 .

[4]  Jean-Marc Franssen,et al.  Fire Design of Steel Structures : Eurocode 1: Actions on structures. Part 1-2: Actions on structures exposed to fire: Eurocode 3: Design of steel structures: Part 1-2: Structural fire design , 2010 .

[5]  T. Wang,et al.  Predicting the fire resistance behaviour of high strength concrete columns , 2004 .

[6]  Venkatesh Kodur,et al.  Performance-based Fire Safety Design of Reinforced Concrete Beams: , 2007 .

[7]  Lars Schiøtt Sørensen,et al.  Test method for spalling of fire exposed concrete , 2005 .

[8]  Maged A. Youssef,et al.  General stress–strain relationship for concrete at elevated temperatures , 2007 .

[9]  Johan Lundin.  On Quantification of Error and Uncertainty in Two-zone Models used in Fire Safety Design , 2005 .

[10]  John Purkiss,et al.  Fire Safety Engineering Design of Structures , 1996 .

[11]  Allan Jowsey,et al.  BRE large compartment fire tests - characterising post-flashover fires for model validation , 2007 .

[12]  Patrick Bamonte,et al.  Today's concretes exposed to fire - test results and sectional analysis , 2008 .

[13]  IBC , 2007, Brain and Development.

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

[15]  Toshimi Kabeyasawa,et al.  Axial-shear-flexure interaction approach for reinforced concrete columns , 2007 .

[16]  Venkatesh Kodur,et al.  Review of post-earthquake fire hazard to building structures , 2008 .

[17]  G. A. Khoury,et al.  An approach for modelling concrete spalling in finite strains , 2010, Math. Comput. Simul..

[18]  C. S. Manohar,et al.  Fire testing of an earthquake damaged RC frame , 2010 .

[19]  Federico M. Mazzolani,et al.  Post-earthquake fire resistance of moment resisting steel frames , 2003 .

[20]  John Taylor,et al.  Post Earthquake Fire in Tall Buildings and the New Zealand Building Code , 2003 .

[21]  Venkatesh Kodur,et al.  Guidelines for Fire Resistance Design of High-strength Concrete Columns , 2005 .

[22]  Raul Zaharia,et al.  Fire after earthquake analysis of steel moment resisting frames , 2009 .

[23]  Ahmed Godat.  Finite element modelling of externally shear-strengthened beams using fibre reinforced polymers , 2008 .

[24]  Ulrich Schneider,et al.  Physical properties and behavior of high-performance concrete at high temperatures , 2010 .

[25]  Andrew C. Long,et al.  Finite element modelling of fabric shear , 2008 .

[26]  Andrew H. Buchanan,et al.  Structural Design for Fire Safety , 2001 .

[27]  Jian Zhao,et al.  Modeling of Strain Penetration Effects in Fiber-Based Analysis of Reinforced Concrete Structures , 2007 .

[28]  D. Drysdale.  An Introduction to Fire Dynamics , 2011 .

[29]  Thomas Lennon,et al.  The natural fire safety concept—full-scale tests at Cardington , 2003 .

[30]  Masanobu Shinozuka,et al.  Hazard Mitigation for Earthquake and Subsequent Fire , 2004 .

[31]  Jean-Marc Franssen,et al.  Fire design of steel structures , 2010 .

[32]  F. Delhomme,et al.  An experimental method for assessing the spalling sensitivity of concrete mixture submitted to high temperature , 2012 .

[33]  Charles Scawthorn,et al.  Fire Following Earthquake , 1986 .

[34]  Jose L. Torero,et al.  Structures in fire or fires in structures? Assessing the true performance of structures in fire , 2013 .

[35]  John M. Eidinger.  Fire Following Earthquake - Flex Hose , 2004 .

[36]  Kang Hai Tan,et al.  Performance Comparison of Zone Models with Compartment Fire Tests , 2007 .

[37]  Jean-Marc Franssen,et al.  User’s manual for SAFIR 2016c A computer program for analysis of structures subjected to fire , 2016 .

[38]  Hyo-Gyoung Kwak,et al.  FE Analysis of RC Beams Based on Moment-Curvature Relation , 2000 .

[39]  Dietmar Hosser,et al.  A parametric natural fire model for the structural fire design of multi-storey buildings , 2007 .

[40]  D. Drysdale.  An Introduction to Fire Dynamics: Drysdale/An Introduction to Fire Dynamics , 2011 .

[41]  김지은,et al.  모멘트-곡률 관계에 기초한 철근콘크리트 보의 비선형 해석 = Nonlinear analysis of RC beams based on moment-curvature relations , 2002 .