双向荷载下组合剪力键剪切机理及抗剪强度计算
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长沙理工大学

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国家重点研发计划项目(2021YFB2600900); 湖南省自然科学基金创新研究群体项目(2020JJ10060)


Shear mechanism and shear strength calculation of composite shear connectors under biaxial load
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1.Changsha University of Science &2.Technology;3.Changsha University of Science and Technology;4.amp

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    摘要:

    为研究双向荷载作用下组合剪力键剪切性能,建立了组合剪力键有限元模型,并结合试验进行了验证;对比了双向和单向推出荷载作用下组合剪力键的破坏形态,研究了双向荷载与组合剪力键抗剪强度比的关系,量化了混凝土强度和贯穿钢筋直径对组合剪力键抗剪强度的影响;揭示了组合剪力键剪切破坏机理,通过多变量回归分析,建立了双向荷载作用下组合剪力键抗剪强度计算模型。结果表明:侧压荷载有效抑制了混凝土横向膨胀,混凝土板出现一条纵向主裂缝和少量横向微裂纹,单向推出荷载作用下,组合剪力键因混凝土板劈裂裂缝贯通而失效;侧压荷载可增加组合剪力键抗剪强度,但混凝土强度较高且贯穿钢筋直径较大时,双向荷载效应较小,抗剪强度比仅为1.05;双向荷载作用下,抗剪强度随混凝土强度和贯穿钢筋直径的增加而显著增加。

    Abstract:

    To investigate the shear performance of composite shear connectors under biaxial load, a finite element model was established and verified by experimental tests. The failure modes of composite shear connectors under biaxial load and unidirectional push-out load were compared, and the relationship between biaxial load and shear strength ratio was also analyzed. The effects of concrete strength and through reinforcement diameter on the shear strength under biaxial load were clarified. The shear mechanism of composite shear connector was revealed. A shear strength model of composite shear connector under biaxial load was established by multivariable regression analysis. The results show that lateral pression can effectively prevent the transverse expansion of concrete, and a longitudinal main crack and a few transverse microcracks appears in the concrete slab. Under the action of unidirectional push-out load, the composite shear connector fails due to the penetration of splitting cracks in the concrete slab. Lateral pression increases the shear strength of composite shear connectors, but the biaxial load effect is small when the concrete strength is high and the diameter of through reinforcement is large (shear strength ratio is 1.05). The shear strength of composite shear connector significantly increases with the increase of concrete strength and through reinforcement diameter under biaxial loading.

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  • 收稿日期:2023-02-07
  • 最后修改日期:2023-04-07
  • 录用日期:2023-04-21
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