Experimental and numerical research on fire resistance of stainless steel-concrete composite beam

Stainless steel has advantages of excellent mechanical and physical properties, aesthetic appearance, superior corrosion resistance, and durability. It has wide applicability in civil engineering and has been gradually applied to composite structures in recent years. However, few studies have been conducted on the fire resistance of stainless steel structures, especially experimental studies on the fire resistance of stainless steel-concrete composite structures. In the present study, a series of fire-resistant tests were conducted on four stainless steelconcrete composite beams with a rectangular cross-section, based on different load ratios. Test phenomena, heating curves, deformation curves, and critical temperatures of specimens were obtained through fire-resistant tests. Test results showed that the stainless steel-concrete composite beam specimens in fire exhibited a bendingshear failure mode. Moreover, the load ratio was a key parameter influencing the fire resistance of the stainless steel-concrete composite beam and exerted a certain influence on the development law of the mid-span vertical displacement of the composite beam. Finally, a finite element model of the stainless steel-concrete composite beam was proposed and verified to accurately simulate the fire resistance of the composite beam.

Automated summary

This study conducted a series of experimental research on the fire resistance of stainless steel-concrete composite beams. The results showed that the specimens of stainless steel-concrete composite beams exhibited a bending-shear failure mode in fire tests. Moreover, the load ratio had a key influence on the fire resistance of the composite beams.