Postheated Model of Confined High Strength Fibrous Concrete

HSC normally suffers from low stiffness and poor strain capacity after exposure to high temperature. High strength confined fibrous concrete (HSCFC) is being used in industrial structures and other high rise buildings that may be subjected to high temperature during operation or in case of an accidental fire. The proper understanding of the effect of elevated temperature on the stress-strain relationship of HSCFC is necessary for the assessment of structural safety. Further stress-strain model of HSCFC after exposure to high temperature is scarce in literature. Experimental results are used to generate the complete stress-strain curves of HSCFC after exposure to high temperature in compression. The variation in concrete mixes was achieved by varying the types of fibre, volume fraction of fibres, and temperature of exposure from ambient to 800°C. The degree of confinement was kept constant in all the specimens. A comparative assessment of different models on the high strength confined concrete was also conducted at different temperature for the accuracy of proposed model. The proposed empirical stress-strain equations are suitable for both high strength confined concrete and HSCFC after exposure to high temperature in compression. The predictions were found to be in good agreement and well fit with experimental results.

[1]  Giuseppe Campione,et al.  COMPRESSIVE STRESS-STRAIN BEHAVIOR OF NORMAL AND HIGH-STRENGTH CARBON-FIBER CONCRETE REINFORCED WITH STEEL SPIRALS , 1999 .

[2]  Venkatesh Kodur,et al.  Effect of silica fume and lateral confinement on fire endurance of high strength concrete columns , 2006 .

[3]  L. Hsu,et al.  Stress-strain behavior of steel-fiber high-strength concrete under compression , 1994 .

[4]  Mohamad J. Terro,et al.  EFFECT OF CONFINEMENT ON SILICEOUS AGGREGATE CONCRETE SUBJECTED TO ELEVATED TEMPERATURES AND CYCLIC HEATING , 1997 .

[5]  S. Popovics.  A numerical approach to the complete stress-strain curve of concrete , 1973 .

[6]  M. A. Mansur,et al.  Closure of "Stress-Strain Relationship of Confined High-Strength Plain and Fiber Concrete" , 1999 .

[7]  H. C. Lima Júnior,et al.  Steel-fibre high-strength concrete prisms confined by rectangular ties under concentric compression , 2004 .

[8]  Cheon-Goo Han,et al.  Performance of spalling resistance of high performance concrete with polypropylene fiber contents and lateral confinement , 2005 .

[9]  T. Paulay,et al.  Strength and Ductility of Frames , 2009 .

[10]  M. Anson,et al.  Effect of high temperatures on high performance steel fibre reinforced concrete , 2006 .

[11]  Hui Li,et al.  Effect of High Temperature on Residual Mechanical Properties of Confined and UnconfinedHigh-Strength Concrete , 2002 .

[12]  Frederic Legeron,et al.  Uniaxial Confinement Model for Normal- and High-Strength Concrete Columns , 2003 .

[13]  Pradeep Bhargava,et al.  Comparative study of confinement models for high-strength concrete columns , 2005 .

[14]  Bijan Samali,et al.  Constitutive Relationships for Steel Fibre Reinforced Concrete at Elevated Temperatures , 2014 .

[15]  U. K. Sharma,et al.  Tie-confined fibre-reinforced high-strength concrete short columns , 2007 .

[16]  Chi Sun Poon,et al.  COMPRESSIVE BEHAVIOR OF FIBER REINFORCED HIGH-PERFORMANCE CONCRETE SUBJECTED TO ELEVATED TEMPERATURES , 2004 .

[17]  Jianzhuang Xiao,et al.  On residual strength of high-performance concrete with and without polypropylene fibres at elevated temperatures , 2006 .

[18]  Takashi Horiguchi,et al.  Effect of short fibers on residual permeability and mechanical properties of hybrid fibre reinforced high strength concrete after heat exposition , 2006 .

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

[20]  Murat Saatcioglu,et al.  Strength and Deformability of Confined High-Strength Concrete Columns , 1994 .

[21]  Patrick Paultre,et al.  Behavior of Steel Fiber-Reinforced High-Strength Concrete Columns under Uniaxial Compression , 2010 .

[22]  N. M. Bhandari,et al.  Strength and deformability of heated confined fibrous concrete , 2012 .

[23]  Patrick Paultre,et al.  Stress-Strain Model for Confined High-Strength Concrete , 1995 .

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

[25]  N. Carino,et al.  REVIEW OF MECHANICAL PROPERTIES OF HSC AT ELEVATED TEMPERATURE , 1998 .

[26]  Shamim A. Sheikh,et al.  STRENGTH AND DUCTILITY OF TIED CONCRETE COLUMNS , 1980 .

[27]  V. Kodur,et al.  Stress-strain curves for high strength concrete at elevated temperatures , 2004 .

[28]  Patrick Paultre,et al.  High‐Strength Concrete Columns Confined by Rectangular Ties , 1994 .

[29]  Kosmas K. Sideris,et al.  Performance of thermally damaged fibre reinforced concretes , 2009 .

[30]  Y. Chen,et al.  Residual stress–strain relationship for concrete after exposure to high temperatures , 2006 .

[31]  Stephen J. Foster,et al.  STRENGTH AND DUCTILITY OF FIBER-REINFORCED HIGH-STRENGTH CONCRETE COLUMNS , 2001 .

[32]  R. Park,et al.  Stress-Strain Behavior of Concrete Confined by Overlapping Hoops at Low and High Strain Rates , 1982 .