The master’s thesis in the Department of Civil Engineering at the College of Engineering at the University of Kerbala, titled (A comparative study of the behaviour of short thin-walled steel columns filled with concrete using different cross-sectional shapes) by the researcher Haitham Abdullah Samir.
This study seeks to provide a better understanding and practical application of recycled concrete-filled steel pipe columns (RACFST), and thus the possibility of using these columns in the construction industry. The study aims to reduce the excessive increase in the extraction of coarse aggregate in many regions of Iraq and the world, which has led to the depletion of natural resources, environmental pollution rates, and the threat to biodiversity. Two categories of green concrete with grades (25 and 40) MPa were used. Recycled concrete-filled steel Tube Columns (RACFST) consist of six different cross sections including; triangle, ellipse, and hexagon, while the remaining three are made of traditional shapes for comparison purposes, including; Circular, square and rectangular.
Finally, the results show that higher values of concrete contribution ratio (C.C.R.) for all columns led to increased strength index (S.I.) values. An increase in the values of ultimate pressures accompanied this increase. Moreover, when high-strength concrete was used instead of normal-strength concrete, the values of ultimate axial failure load, ultimate stress at service limit, strength index, and concrete contribution ratio (C.C.R.) increased, while ductility index values decreased.
The thesis was approved by the discussion committee, which consisted of Professor Dr. Hossam Ali Muhammad / Al-Furat Al-Awsat Technical University (Chairman), Professor Dr. Sajjad Amer Hamza / College of Engineering, University of Kerbala (member), and Assistant Professor Dr. Wajdi Shubar Sahib / College of Engineering, University of Kerbala (member) And Professor Dr. Ali Hamid Nasser / University of Kerbala, College of Engineering (member and supervisor
