预制-装配式多键群剪力键力学行为试验研究
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重庆交通大学 土木工程学院

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TU398.9 TU317.1

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Experimental study on mechanical behavior of prefabricated multi group shear key
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College of Civil Engineering,Chongqing Jiaotong University

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    摘要:

    装配式钢-混组合结构在桥梁工程中使用日益广泛,其中预制-装配式集束群钉剪力键力学行为研究对装配式钢-混组合桥梁的安全应用有重要意义。为研究预制-装配式群钉连接件键群数量对剪力键受力特性的影响,开展了单键群及双键群装配式钉群剪力键推出加载试验,对比研究单键群和双键群试件的荷载滑移曲线、破坏形态及抗剪承载力,并结合三键群及四键群试件数值模拟,研究多键群下的装配式剪力键承载力折减效应。研究表明:单键群和双键群剪力键的破坏模式均为栓钉剪断,单键群试件的裂缝数量少于双键群试件;承载力折减效应随着键群数量的增多而增加;键群间受力不均匀现象随荷载增大逐渐显著;基于能量法分析了多键群间由于受力不均匀产生的多键群承载力折减效应,提出了多键群装配式剪力键承载力折减系数计算表达式。研究成果对于预制-装配式群钉剪力键在装配式组合梁中的应用提供了重要理论参考。

    Abstract:

    Prefabricated steel-concrete composite structure is widely used in bridge engineering, and the research on mechanical behavior of prefabricated assembled cluster nail shear key is of great significance to the safety application of prefabricated steel-concrete composite bridge. In order to find out the influence of the number of groups on the mechanical properties of shear keys, the push-out loading tests of single key group and double key group are carried out. The load-slip curve, failure form and shear capacity of the group specimens, combined with the numerical simulation of the three-bond group and four-bond group specimens, are used to study the bearing capacity reduction effect of the assembled shear key under the multi-bond group. The results show that the failure modes of the single bond group and the double bond group shear bond are both stud shearing, however, the number of cracks of the single bond group specimen is less than that of the double bond group specimen. Meanwhile, it is the fact that the reduction effect of bearing capacity increases with the increase of the number of bond groups, and the non-uniform phenomenon between bond groups is gradually significant with the increase of load. Based on the energy method, the bearing capacity reduction effect of multi bond group due to uneven force is analyzed, and a simplified formula of bearing capacity reduction factor is proposed. The research

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  • 收稿日期:2020-08-05
  • 最后修改日期:2020-10-19
  • 录用日期:2020-11-23
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