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考虑疲劳损伤的栓钉连接件抗剪承载力研究

, PP. 88-93

Keywords: 桥梁工程,栓钉连接件,断裂力学,残余抗剪承载力,疲劳累积损伤

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Abstract:

?针对钢-混凝土组合梁桥在结合面处承受反复剪力作用的栓钉连接件极限承载力降低现象进行了试验研究。基于考虑构件初始缺陷影响的断裂力学方法,建立了栓钉连接件疲劳寿命分析模型,并通过试验数据确定了模型参数,提出了栓钉连接件残余抗剪承载力与等幅循环荷载加载次数关系的计算方法,采用此计算方法对不同的影响因素进行了参数分析。研究结果表明:栓钉直径越大,其抗剪承载力退化程度越大;栓钉初始缺陷率大于0.1且剪应力幅值大于100MPa时,其抗剪承载力降低速度很快,在工程设计中须加以控制。

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