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高温对建筑混凝土材料抗震抗压的作用及原理

, PP. 1436-1442

Keywords: 混凝土材料,破坏形态,抗压强度,抗震性能,受剪承载力

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Abstract:

分两次试验分别对高温作用下混凝土材料的抗压强度变化与抗震性能变化进行了相关的研究。将未受火的试件与受火试件进行对比,通过对混凝土破坏形态的研究,运用SPSS统计分析软件对温度与抗压强度的变化进行整理,得出温度静置时间与抗压强度的关系;通过对受火后试件骨架曲线,刚度、延展性和承载力的分析,得出结论:高温作用后,试件的屈服载荷、峰值载荷和极限载荷均大幅度降低,而剪承载力则随着轴压比的增大而增大,超过一定界限后,反而会降低。同时,本文提出了受剪承载力的计算公式,在实际生活中,可将该公式作为火灾后的建筑物破坏鉴定。

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