Fire resistance analysis of cold-formed steel sandwich thin-plate shear wall under vertical loadings
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Abstract:
In order to obtain the fire-resistance performance of cold-formed steel sandwich thin-plate shear wall, seven models of cold-formed steel sandwich thin-plate shear wall were established by using finite element software ABAQUS, and the temperature distribution of cold-formed steel sandwich thin-plate shear wall under fire, as well as the influence of axial pressure ratio, thickness of side columns of cold-formed steel sandwich thin-plate shear wall and vertical stiffeners on the fire-resistance performance of the walls were analyzed. The results show that the temperature of the embedded steel plate is 80% of the maximum temperature of the wall after it has been exposed to fire for 2 hours, and the temperature at the web of the hat shaped section on the back fire surface of the side column and vertical stiffener is about one fourth of that of the corresponding position of the fire surface. With the increase of axial compression ratio, the damage position of the wall under fire moves up and changes from global buckling to local buckling. The thickness of the side column has a great influence on the failure mode and fire resistance limit of the wall, and it is recommended that the thickness of the side column should be not less than 2.5 mm. The wall with stiffener can use vertical stiffeners to balance the uneven tension of steel plate caused by premature buckling of stiffener, which can delay the damage of the wall under fire. The bending direction of the wall is related to the bearing capacity of side column, and when the wall is bent, the hat brim of the side column first bends greatly, and then the whole section yields.
