Experimental and numerical
behaviour of hybrid R.C. columns
under the effect of fire furnace
Ali Kadhim Sallal and Seyed Alireza Zareei
Department of Civil Engineering,
Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran
Haitham A.B. Al-Thairy
Department of Civil Engineering, College of Engineering, Al-Qadisiyah University,
AL-Diwanya, Iraq and
Department of Civil Engineering, University of Warith Al Anbiyaa,
Karbala, Iraq, and
Niloofar Salemi
Department of Civil Engineering,
Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran
Abstract
Purpose – The purpose of this research is to study the effect of high temperature on concrete columns which are
considered the most important part of the concrete structure. Glass fibres were used to study the effect of heat on
them as well as on the properties of reinforcing steel and concrete.
Design/methodology/approach – High tensile stress may develop at the tension zone of the column section
when the column is exposed to an axial compressive load with a relatively high eccentricity. Since fibre bars
have a higher tensile strength than steel bars, they can be used in the tension zone of hybrid reinforced concrete
columns to resist tensile stress, while steel bars can be used in the compression zone to resist compressive stress.
However, as documented in prior research studies and advised by standards and codes, the mechanical qualities
of concrete, steel and fibre bars are considerably damaged when hybrid columns are exposed to high
temperatures.
Findings – When the fire temperature rises, the ultimate load value of the reinforced concrete column decreases.
Also, steel bar reinforcing is more efficient than glass fibre bars in resisting high temperatures. The rate decrease
in the strength of reinforced concrete columns to applied load on it decreases with the rise of the temperature to
which the specimen was exposed during the burning period.
Originality/value – The experimental and numerical work includes a study of the effect of a fire furnace on the
behaviour of hybrid R.C. columns. Three types of reinforcement were used steel bars only, G.F.R.P bars only and
hybrid (steel and G.F.R.P) bars. These columns specimens were cast and divided into three groups according to
the details of reinforcement, the effect of fire temperature and according to the eccentricity ratio. Two types of
hybrid are used in this work. Fourteen R.C. columns were casted and divided into, 4 specimens not burn and 10
specimens burn at temperatures 300, 500 and 700.
Keywords Hybrid R.C. columns, Electrical fire furnace, Fire effect, Experimental work, ABAQUS software
Paper type Research paper

ali khadim paper fir 23-10-1403_compressed