Study on mechanical performance of hexagonal cellular composite beams after fire
Investigating the mechanical performance of cellular composite beams after fire can provide an important reference for the reinforcement and restoration of building structures after fire.This paper conducted static loading tests on two post-fire hexagonal cellular composite beams,analyzing the failure modes and load-bearing capabilities of hexagonal cellular composite beams with varying opening ratios.The results show that,under positive moments after fire,hexagonal cellular composite beams experienced bending failure,with the third hole near the beam's end undergoing severe compression deformation and localized buckling of the steel beam webs on both sides.Notably,the concrete between the two loading points suffered substantial damage,exhibiting longitudinal through cracks in the upper slab surface of the steel beam.The opening ratio is a significant factor affecting the ultimate bearing capacity of hexagonal cellular composite beams afterfire.Compared with hexagonal cellular composite beams with a 70%opening ratio,those with a 60%opening ratio demonstrated a 20%increase in ultimate load capacity and a 35%improvement in ductility.Additionally,a method for calculating the residual bearing capacity of hexagonal cellular composite beams after the fire is proposed,showcasing commendable accuracy.
万方数据
维普
