The College of Engineering, Mustansiriyah University discussed a master thesis on the bending behavior of high-performance concrete-filled steel tubes by the postgraduate student, Mr. Muhannad Hassan Fadhil.

The thesis evaluated the structural performance of concrete-filled steel tube beams encased in an outer layer of concrete when subjected to concentrated loads at two loading points, as well as studying their ability to resist bending stresses and comparing their performance to that of conventional reinforced concrete beams.

The thesis included a practical program that involved testing 21 beams, including a reference beam of conventional reinforced concrete measuring 150 x 220 x 1500 mm, as well as a group of composite beams consisting of circular and rectangular steel tubes filled with concrete and encased in an outer layer of fiber-reinforced concrete of the same dimensions. 

The thesis reviewed that concrete-encased composite beams (CFST) achieved an increase in maximum load-bearing capacity of approximately 3% compared to conventional reinforced concrete beams.

The thesis concluded that this composite structural system is characterized by a high level of ductility and structural efficiency, making it a promising option for use in multi-story buildings, long-span structures, bridges, metro stations, and other modern engineering applications.