Axially loaded single threaded rod glued in glubam joint
Axially loaded single threaded rod glued in glubam joint
复制标题
轴向加载的单螺纹杆粘在胶合接头中
DOI：
10.1016/j.conbuildmat.2020.118302
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发表时间：
2020-05
影响因子：
7.4
通讯作者：
Y. Xiao
中科院分区：
文献类型：
--
作者：
Y. Xiao
在现代木结构中，粘钢棒被认为是坚固且非常有效的连接，可以承受高强度的力。为了将这种连接方式应用于竹集成材节点，本文对竹集成材单螺杆胶合连接进行了一系列的研究。共17组，每组包括6个相同的glubam样本与胶粘在螺纹杆平行于纵向竹条（纤维）的方向，进行了测试，以失败的pull-pull配置。据观察，试样表现出四种不同的破坏模式，包括两种类型的剪切破坏在不同的接口。结果表明，胶合后螺纹杆的粘结应力分布不均匀，在两端附近较大，中间区域较小。分析了锚固长度、钻孔直径、粘结长径比、边缘距离和胶层厚度等参数对抗剪强度的影响，并讨论了各参数与抗剪强度的相关性。并提出了设计建议，包括边距下限可取为螺杆直径的2.3倍，胶层厚度不应大于2 mm。同时，分析结果表明，现有的木材胶接杆模型不能直接应用于胶合板胶接螺纹杆的强度计算。根据目前的研究结果，提出了一个强度模型的胶合螺纹在glubam。
Glued-in steel rod is known as strong and very efficient connection in withstanding high forces utilized in modern timber structures. In order to apply this connection for the glued laminated bamboo (glubam) joints, a series of investigations were performed on the single glued-in threaded rod in glubam in this study. Total seventeen groups, each including six identical glubam specimens with glued-in threaded rod parallel to the longitudinal bamboo strip (fiber) direction, were tested to failure in the pull-pull configuration. It is observed that the specimens exhibited four different failure modes, including two types of shear failure at different interfaces. The study revealed that the bond stress distribution of glued-in threaded rod in glubam was not uniform, larger near two ends and smaller in the middle zone. The influence of the anchorage length, drill-hole diameter, bonding length-diameter ratio, edge distance and glue-line thickness were evaluated, and the correlations between each parameter and the shear strength were discussed. Design proposals were also provided, including that the lower limit of edge distance can be taken as 2.3 times of the threaded rod diameter, and the glue-line thickness should not be more than 2 mm. Meanwhile, analytical results showed that the existing models for the glued-in rod in timber cannot be directly applied to calculate the strength of the glued-in threaded rod in glubam. Based on the findings in current study, a strength model for the glued-in threaded in glubam was suggested.
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