毛竹内嵌杉木的螺栓连接抗拉力学性能
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重庆大学

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中图分类号:

TU366.1

基金项目:

“十三五”国家重点研发计划课题(2017YFC0703504);重庆市研究生科研创新项目(CYS20026)


Tensile properties of bolted connections of Moso Bamboo embedded with Chinese fir
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Affiliation:

Chongqing University

Fund Project:

13th Five-Year National Key R&D Project (No. 2017YFC0703504); Chongqing Postgraduate Research and Innovation Project (No. CYS20026)

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    摘要:

    在竹结构中柱脚一般会出现受拉荷载,针对这种现象提出了一种内嵌杉木的毛竹螺栓连接形式,因此,设计了15个内嵌杉木的毛竹螺栓连接试件并进行了轴向拉伸试验。首先根据Karacabeyli-Ceccotti建议的50%极限荷载法确定了试件的屈服荷载和屈服位移,其次阐述了荷载-位移曲线中不同变形阶段的特征,最后分析了螺栓直径和螺孔端距对连接试件的承载力和破坏模式的影响。结果表明该连接具有一定的承载力和变形能力,连接承载力随着螺杆直径增大而增大。连接在受拉时荷载-位移曲线具有两个弹性段,且第二弹性阶段存在刚度下降。连接的三种破坏模式为螺杆弯坏、竹壁剪出和竹壁开裂,失效模式由螺孔端距和螺杆直径控制。基于简化力学模型推导的公式能近似地预测连接承载力,为这类节点的设计提供参考。

    Abstract:

    In the actual bamboo structures, the column base usually has tensile load. In view of this phenomenon, a kind of bamboo bolt connection with embedded wood was proposed. Therefore, the axial tensile test of 15 bamboo bolt connection specimens with embedded wood was designed. Firstly, the yield load and yield displacement of the load displacement curve are determined according to 50% of the maximum capacity of Karacabeyli-Ceccotti, and then the characteristics of different deformation stages in the load displacement curve are evaluated. Finally, the influence of bolt diameter and screw hole end distance on the bearing capacity and failure mode of these connection specimens is analyzed. The results showed that the connection has a certain bearing capacity and deformation capacity, and the bearing capacity increases with the increase of screw diameter. The load displacement curve of the connection has two elastic segments in tension, and the stiffness decreases in the second elastic stage. The three failure modes are screw bending, bamboo wall punching shear and bamboo wall cracking. The failure mode is controlled by screw hole end distance and screw diameter. The formula derived from the simplified mechanical model can approximately predict the bearing capacity of the joint, which provides a reference for the design of this kind of joint.

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  • 收稿日期:2021-01-26
  • 最后修改日期:2021-03-18
  • 录用日期:2021-03-25
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