Shear Behavior of Concrete-reinforced Web Composite Beams with Corrugated Webs at High Temperature
The numerical models of corrugated steel web composite beam(CBCW)and corrugated steel web-lined concrete composite beam(CBCWC)under fire were established by using finite element soft-ware,and the evolution of principal stress and shear stress of composite beams at high temperature and the bearing-shear ratio of each component of composite beam section were studied.The results show that the temperature gradient in the lining concrete changes the bearing capacity and force trans-mission path of the lining concrete at high temperature,and then affects the shear distribution mecha-nism of CBCWC.Compared with CBCW,the shear performance of corrugated steel webs in CBCWC is significantly improved at high temperature.In the critical state,the failure mechanism of CBCW is severe shear buckling of corrugated steel webs,and the shear mechanism of CBCWC can be equivalent to a mechanical"truss"model,and the failure mechanism is the loss of bearing capacity of equivalent tie bars and equivalent compression bars.Compared with CBCW,the lining concrete arranged in CBC-WC inhibits the high-temperature shear buckling of corrugated steel webs and significantly improves the fire resistance of composite beams at high temperatures.
fire resistanceshear behaviorcorrugated steel websencased-concretenonlinear finite element
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