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钢锚箱栓钉剪力连接件群钉效应及抗剪承载力计算方法

, PP. 33-45

Keywords: 桥梁工程,栓钉群钉剪力连接件,有限元分析,群钉效应,抗剪承载力,抗剪刚度

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Abstract:

?为了深入研究钢锚箱栓钉群钉剪力连接件的受力特性,对其群钉效应及主要影响因素进行了有限元分析,进而考虑由群钉效应所引起的单钉平均抗剪承载力降低现象,给出了计入承载力折减系数的群钉连接件抗剪承载力计算公式。研究结果表明:群钉效应将导致栓钉连接件单钉平均抗剪承载力和抗剪刚度显著降低及栓钉传力不均匀现象,同时也将造成栓钉轴向应力的变化,但对栓钉剪应力和弯曲应力水平及其分布形式无明显影响;随着栓钉层数的增加,栓钉单钉平均抗剪承载力及抗剪刚度逐渐减小;当栓钉层间距由2.3倍栓钉直径增加至13.6倍栓钉直径时,栓钉单钉平均抗剪承载力先增大后减小,单钉平均抗剪刚度逐渐降低;当连接件的破坏形态为栓钉的弯剪破坏时,混凝土强度等级的提高对群钉连接件抗剪承载力影响较小,但可提高其抗剪刚度;提出的栓钉群钉连接件抗剪承载力计算公式可为钢锚箱栓钉群的合理布置提供理论依据。

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