Abstract
This paper is to study the fire resistance of castellated composite beams. Based on experiment, a reasonable castellated composite beam model is established by using finite element software. The critical temperature of castellated composite beams influenced by hole opening ratio, hole pitch, width-thickness ratio of the web and stiffener have been analyzed. The result shows that stiffener has a great influence on the fire resistance of castellated composite beams, which can increase the critical temperature greatly. The width-thickness ratio of the web has some influence on the buckling behavior of castellated composite beams under fire condition. When width-thickness ratio is higher, the web is more prone to buckling failure. The hole opening ratio and hole pitch have a little influence on the fire resistance of castellated composite beams.
Highlights
The castellated composite beam is a composite structure that connects the castellated steel beam to the concrete floor through the shear connector and make them be jointly forced
The holes of the castellated composite beam are convenient for crossing the pipeline, effectively reducing the height of the layer and saving the steel, which have good economic and social benefits [2].While the concrete floor can play the role of improving the fire resistance of the steel beam [3].Compared with the solid composite beams, the holes of the castellated beams damage the continuity of the web, and cause the temperature of the web between the holes to be higher
The finite element software ABAQUS is used to establish the analysis model of castellated composite beam under the condition of increasing temperature
Summary
The castellated composite beam is a composite structure that connects the castellated steel beam to the concrete floor through the shear connector and make them be jointly forced. The holes of the castellated composite beam are convenient for crossing the pipeline, effectively reducing the height of the layer and saving the steel, which have good economic and social benefits [2].While the concrete floor can play the role of improving the fire resistance of the steel beam [3].Compared with the solid composite beams, the holes of the castellated beams damage the continuity of the web, and cause the temperature of the web between the holes to be higher. The purpose of this study is to assess the effect of hole opening ratio, hole pitch, width-thickness ratio and stiffener on critical temperature, and to provide references for the fire resistance design of castellated steel structures
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