Investigation on Fire Resistance of Novel Corrugated Steel-encased Concrete Composite Beams
The thermal-mechanical coupling model of composite beams was established by ABAQUS.The influence of load ratio,thickness of corrugated steel web,thickness of lower flange steel plate and thickness of protective layer of prestressed tendons on the fire resistance of composite beams was studied by analyzing the curves of mid-span deflection and fire resistance limit with temperature.The results show that under high temperature,the steel web of the new composite beam does not bulge,and the angle steel connector plays a good role in anti-sliding,and the fire resistance is significantly enhanced.The greater the load ratio,the lower the critical temperature.When the load ratio is 0.3～0.5,the new composite beam has good deformation performance,and the critical state is the strength failure of plastic hinge.With the increase of corrugated steel web thickness,the fire resistance limit of new composite beams increases,and the lifting range decreases with the increase of load ratio.With the increase of the thickness of the lower flange steel plate,the fire resistance limit of the new com-posite beam increases,and the lifting range increases with the increase of the load ratio.When the thickness of the protective layer of prestressed tendons is less than 40 mm,the fire resistance of com-posite beams decreases with the decrease of the thickness.When it is greater than 40 mm,the influ-ence is small.
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