Abstract:
Concrete filled steel tube (CFST) is a composite
material which is increasingly used in the civil engineering
industry. So, it is required to identify the properties of concretefilled
steel tubes as a composite material. This paper focuses on
a study conducted on concrete-filled circular steel tubes and
galvanised square sections. Concrete filled circular steel tubes
were tested under axial compression with three different
diameter-to-thickness (D/t) ratios and two different concrete
compressive strengths since CFSTs are most effective as
compression members. Galvanised steel square sections were
also tested for compression capacity and failure mode. Finite
element model was developed using the ABAQUS software and
two experimental programmes were carried out to find material
properties of concrete and steel for finite element modelling and
two experimental programmes were carried out to verify the
finite element modelling. Galvanised iron square sections were
modelled using MIDAS gen software and verified with
experimental results for the failure load and failure mode also.
The axial capacity of CFST was found theoretically using two
different codes and one equation found in the literature.
Experimental as well as numerical results showed that the axial
capacity of CFST increases as the concrete infill increases and
decreases with D/t ratios.
Citation:
P. B. M. R. Bogahawaththa, K. P. Madhuranga, K. Baskaran and H. D. Hidallana-Gamage, "Study on Concrete Filled Steel Circular and Square Tubes," 2020 Moratuwa Engineering Research Conference (MERCon), 2020, pp. 42-47, doi: 10.1109/MERCon50084.2020.9185319.