Advisor(s)
Abstract(s)
Composite structures made from the combination of steel profile and concrete have significant loadbearing capacity which
depends on the behaviour of the two material components and their interaction, particularly in fire conditions. It is not possible
to assess the fire resistance of composite members only by considering the temperature of the steel, because the presence of
the concrete may contribute greatly to increase the resistance, strength and thermal inertia of the member, which improves
consequently the fire behaviour of the element. The aim of this work is to develop an efficient non-linear 3D finite element
model to investigate the behaviour of pin-ended axially loaded composite column made from high strength concrete (HSC)
and normal strength concrete (NSC) at different fire rating classes. Two types of column section were selected, notably HEB
160 profile totally encased with concrete and HEB220 partially encased with concrete. The fire behaviour of the columns
was tested according to ISO834 standard fire. The results show that the use of HSC in composite columns reduces the level
of fire protection with the regard to NSC. NSC in composite structures accommodates higher deflections than HSC, which
is safer in case of fire accident. The mechanical resistance in composite columns at room temperature is reduced more than
twice after 30 min of fire exposure.
Description
Keywords
Buckling Composite column Concrete Finite elements Fire Non-linear
Pedagogical Context
Citation
Fellouh, Abdelkadir; Bougara, Abdelkader; Piloto, Paulo A.G.; Benlakehal, Nourredine (2019). Non-linear buckling analysis of composite columns made from high and normal strength concrete under fire. Asian Journal of Civil Engineering. ISSN 1563-0854. p. 1-11