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对带肋薄壁方钢管混凝土柱在火灾下的承载力进行了分析,考察了各重要参数对构件承载力影响系数的影响。结果表明:在火灾作用下,带肋薄壁方钢管混凝土柱的承载力损失较为严重,在一定参数范围内,截面尺寸、构件长细比和防火保护层厚度对火灾下构件承载力影响系数的影响较大,荷载偏心率、截面含钢率的影响次之,钢管屈服强度、加劲肋屈服强度、混凝土抗压强度的影响较小,加劲肋宽厚比在荷载比≤0.3且宽厚比≤25的情况下有一定影响。在构件外表面采用防火保护能有效提高耐火极限,而且厚涂型钢结构防火涂料的效果明显优于水泥砂浆保护层。
The bearing capacity of CFST columns with thin-walled CFST under fire was analyzed, and the influence of each important parameter on the bearing coefficient of members was investigated. The results show that under the action of fire, the bearing capacity of CFST column with thin-walled CFST is more serious. Under a certain range of parameters, the influence of section size, slenderness ratio and thickness of fire protective layer on the influence coefficient of bearing capacity under fire Large load eccentricity, and the steel content in the section are the second, the yield strength of steel pipe, the yield strength of stiffener and the compressive strength of concrete are less affected. The ratio of stiffener to stiffener in the case of load ratio≤0.3 and aspect ratio≤25 Have a certain influence. The use of fire protection on the outer surface of the component can effectively improve the fire resistance, and the effect of the thick-coated steel structure fire-retardant coating is obviously better than that of the cement mortar.