受火冷却后钢筋混凝土梁斜截面抗剪承载力分析

研究受火冷却后钢筋混凝土梁抗剪承载力的计算方法,从材料性能和抗剪传力机理两个方面分析了受火冷却后钢筋混凝土梁抗剪承载力下降的原因。建议了受火冷却后钢筋混凝土梁抗剪承载力计算公式。根据受火冷却后钢筋混凝土梁试验结果对集中荷载作用下抗剪承载力折减系数的取值进行了分析,参考试验值建议了适当的抗剪承载力折减系数,计算值具有一定的安全储备,可满足工程要求。还需要进一步研究钢筋混凝土梁抗剪承载力折减系数的取值。

Analysis of shear capacity for fire-damaged reinforced concrete beams

In order to research the calculating method of shear capacity for fire-damaged reinforced concrete （RC） beams,the reason of drop of shear capacity was analyzed from material properties and mechanical change of shear strength of fire-damaged RC beams. Formulas of fire-damaged RC beams were suggested. Based on test analysis, the values of reduction factors of shear capacity were proposed for concentrated loads. The results showed that suggested calculating method is capable of predicting shear capacity of fire- damaged RC beams exactly. The values of reduction factors of shear capacity need further research.