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工程力学  2014 

再生粗骨料含量对钢管再生混凝土粘结强度及失效性态的影响研究

DOI: doi:10.6052/j.issn.1000-4750.2012.11.0887, PP. 70-78

Keywords: 钢管混凝土,再生混凝土,取代率,粘结强度,损伤

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Abstract:

为了探究再生粗骨料取代率对钢管与再生混凝土界面粘结强度及破坏机理的影响,设计15个圆钢管再生混凝土和9个方钢管再生混凝土短柱试件,以混凝土强度等级和长径比为变化参数分组进行取代率的影响分析.通过推出试验,获取荷载-滑移曲线的特征点参数,回归得到极限粘结强度的计算公式.从界面耗能、粘结抗剪刚度、损伤等角度分析了取代率对其内在失效机理的影响.研究结果表明:极限粘结强度拟合公式计算值与试验实测值吻合较好;再生粗骨料取代率变化对钢管再生混凝土接触界面粘结失效过程的耗能能力影响不大;而界面弹性粘结剪切刚度却随着取代率的增加而降低;剪切刚度退化速度则相反,随着取代率的增加而加快;再生粗骨料粘附的水泥基和内部裂纹会加快钢管再生混凝土界面的粘结损伤过程.

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