Experimental and numerical
\nbehaviour of hybrid R.C. columns
\nunder the effect of fire furnace
\nAli Kadhim Sallal and Seyed Alireza Zareei
\nDepartment of Civil Engineering,
\nIsfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran
\nHaitham A.B. Al-Thairy
\nDepartment of Civil Engineering, College of Engineering, Al-Qadisiyah University,
\nAL-Diwanya, Iraq and
\nDepartment of Civil Engineering, University of Warith Al Anbiyaa,
\nKarbala, Iraq, and
\nNiloofar Salemi
\nDepartment of Civil Engineering,
\nIsfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran
\nAbstract
\nPurpose \u2013 The purpose of this research is to study the effect of high temperature on concrete columns which are
\nconsidered the most important part of the concrete structure. Glass fibres were used to study the effect of heat on
\nthem as well as on the properties of reinforcing steel and concrete.
\nDesign\/methodology\/approach \u2013 High tensile stress may develop at the tension zone of the column section
\nwhen the column is exposed to an axial compressive load with a relatively high eccentricity. Since fibre bars
\nhave a higher tensile strength than steel bars, they can be used in the tension zone of hybrid reinforced concrete
\ncolumns to resist tensile stress, while steel bars can be used in the compression zone to resist compressive stress.
\nHowever, as documented in prior research studies and advised by standards and codes, the mechanical qualities
\nof concrete, steel and fibre bars are considerably damaged when hybrid columns are exposed to high
\ntemperatures.
\nFindings \u2013 When the fire temperature rises, the ultimate load value of the reinforced concrete column decreases.
\nAlso, steel bar reinforcing is more efficient than glass fibre bars in resisting high temperatures. The rate decrease
\nin the strength of reinforced concrete columns to applied load on it decreases with the rise of the temperature to
\nwhich the specimen was exposed during the burning period.
\nOriginality\/value \u2013 The experimental and numerical work includes a study of the effect of a fire furnace on the
\nbehaviour of hybrid R.C. columns. Three types of reinforcement were used steel bars only, G.F.R.P bars only and
\nhybrid (steel and G.F.R.P) bars. These columns specimens were cast and divided into three groups according to
\nthe details of reinforcement, the effect of fire temperature and according to the eccentricity ratio. Two types of
\nhybrid are used in this work. Fourteen R.C. columns were casted and divided into, 4 specimens not burn and 10
\nspecimens burn at temperatures 300, 500 and 700.
\nKeywords Hybrid R.C. columns, Electrical fire furnace, Fire effect, Experimental work, ABAQUS software
\nPaper type Research paper<\/p>\n