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工程力学  2015 

高温后型钢混凝土粘结滑移性能研究

Keywords: 高温后,型钢混凝土,粘结强度,滑移,粘结滑移本构关系

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Abstract:

高温后型钢与混凝土之间的粘结滑移对型钢混凝土结构的高温后力学性能具有重要影响,为了研究高温后型钢混凝土的粘结强度与滑移特性,进行18个高温后型钢混凝土短柱推出试验及3个常温下的对比试验。试验结果表明:高温后型钢混凝土短柱试件的荷载-滑移曲线与常温下大体相似,但随着曾经经历最高温度的提高及最高温度持续时间的增大,型钢与混凝土之间的极限粘结强度和残余粘结强度降低,与极限粘结强度相对应的滑移减小,与残余粘结强度相对应的滑移增大。在试验结果基础上,构建了高温后型钢混凝土粘结滑移本构模型,提出了本构模型中极限粘结强度、残余粘结强度及相应滑移的计算方法,计算结果与试验结果总体相符,研究成果为高温后型钢混凝土构件考虑粘结滑移影响的数值模拟分析提供了条件。

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