装配式钢-UHPC组合梁群钉连接件受力性能研究
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U443.32

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天津市交通运输科技发展计划项目(2019B-21)


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    摘要:

    为研究装配式钢-UHPC组合梁中群钉连接件在不同应力状态下的结构性能,开展了三组群钉连接件的推出试验和两组拉剪试验,考虑栓钉间距、高径比和拉剪比对UHPC中群钉连接件破坏形态、承载能力和延性的影响,提出UHPC中群钉连接件荷载-滑移关系表达式。结果表明:推出试验和拉剪试验的破坏模式均为栓钉被剪断;剪切荷载下,减小栓钉间距会降低群钉连接件的承载力和延性,栓钉高径比对极限承载力和相对滑移的影响较小,短栓钉在UHPC中仍能发挥其抗剪性能,建议群钉连接件中栓钉间距不小于4倍栓钉直径,UHPC板中群钉连接件采用弹性理论进行设计。拉剪荷载下,拉剪比为0.17时拉力作用对群钉连接件受力性能影响可忽略,拉剪比为0.27时拉力作用明显削弱了UHPC板中群钉连接件的承载能力和延性。提出的荷载-相对滑移关系的计算模型能够准确的描述UHPC板中群钉连接件的行为。

    Abstract:

    To study the properties of grouped stud connectors in prefabricated steel-UHPC composite beam under different stress states, three series of push-out tests and two series of tension-shear tests were carried out. The effects of stud spacing, aspect ratio and the ratio of tension to shear on failure modes, bearing capacity and ductility of grouped stud connectors in UHPC composite beams were considered. The expression of load-slip relationship of grouped stud connectors in UHPC is proposed. The results show that the failure mode of push-out test and tension-shear test was governed by stud fracture. Under the shear load, decreasing the stud spacing reduced the bearing capacity and ductility of grouped stud connectors. The aspect ratio of stud represented little influence on the ultimate bearing capacity and the relative slip of grouped stud connectors, which illustrated that the short stud could still play the shear performance in UHPC. It is recommended that the stud spacing of grouped stud connectors should not less than 4 times stud diameter and the grouped stud connectors in UHPC can be designed based on elastic theory. When the ratio of tension to shear is 0.17, the influence of tensile force on the mechanical properties of the stud connectors is negligible. When the ratio of tension to shear is 0.27, the tensile force obviously decreased the bearing capacity and ductility of grouped stud connectors in UHPC. The proposed load-relative slip model can accurately describe the behavior of stud connectors in UHPC decks.

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  • 收稿日期:2021-09-30
  • 最后修改日期:2021-11-03
  • 录用日期:2021-11-09
  • 在线发布日期: 2022-07-21
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