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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。
Experimental study on the reduction of ultimate bearing capacity of peg-joints subjected to repeated shear at steel-concrete composite beam bridges was conducted. Based on the fracture mechanics method which takes into account the influence of the initial defects of the components, the fatigue life analysis model of the bolted connections is established, and the model parameters are determined through the experimental data. The relationship between the residual shear strength of the bolted connections and the loading times The calculation method is used to analyze the parameters of different influencing factors. The results show that the larger the diameter of the stud is, the greater the degradation of the shear strength is. The initial shear rate of the stud is greater than 0.1 and the shear stress is greater than 100 MPa, the shear capacity of the stud decreases rapidly. In the engineering design Must be controlled.