Experiments on laminated bamboo lumber nailed connections
Experiments on laminated bamboo lumber nailed connections
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DOI：
10.1016/j.conbuildmat.2020.121321
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发表时间：
2020-10
影响因子：
7.4
通讯作者：
Guo Chen;Wenqi Yang;Tong Zhou;Yunfei Yu;Jing Wu;Hao Jiang;Li Xiang;Yongxing Zhang
中科院分区：
文献类型：
--
作者：
Guo Chen;Wenqi Yang;Tong Zhou;Yunfei Yu;Jing Wu;Hao Jiang;Li Xiang;Yongxing Zhang
介绍了竹集成材钉连接的主要构件和夹在侧面构件之间的钉连接，它对竹建筑的安全可靠起着至关重要的作用。然而，很少有研究关注的力学性能的连接。本文通过试验研究了钉径、钉数和排数等参数对节点的参考荷载（屈服荷载和最大荷载）、刚度和荷载-滑移性能的影响。对于单钉连接，在LBL构件中形成钉穿和塑性铰。在多钉连接中观察到从延性响应到脆性破坏的模式转换，其中一个或多个劈裂裂纹从钉孔边缘向侧部或中间构件的端部发展。随着钉的直径和数量的增加，连接的延性降低。计算了排钉有效个数的承载力，并与已有的解析公式进行了比较。从现有的各种理论模式的预测与实验确定的能力钉连接每个剪切平面每个钉，并得出结论，连接与横向加载钉的承载能力可以应用到准确地估计使用欧洲屈服模型（EYMS）。此外，由Folz开发的模型能够预测LBL钉连接的荷载-滑移关系。研究结果将为含LBL钉连接的工程竹结构的设计和有限元数值模拟提供科学依据和有用信息，促进竹资源在土木工程领域的合理利用。
Laminated bamboo lumber (LBL) nailed connection made with LBL main member and sandwiched by LBL side members is introduced, which plays an essential role in the safe and reliability of bamboo buildings. However, little research attention has been paid on to the mechanical behavior of connections. This paper reports an experimental study on the effect of parameters on reference loads (yield load and maximum load), stiffness and load-slip behavior of the connections, including nail diameter, number of lines and rows of nails. For single nail connection, nail pull-through and plastic hinges forms in LBL members. Mode cross-over from ductile response to brittle failure is observed in multi-nail connections with one or more splitting cracks develop from the nails hole edges toward the ends of the side or middle members. A decreasing ductility of connections is investigated with increasing diameter and number of nails. The capacity of effective number of nails in a row is evaluated and compared with that obtained from existing analytical formulas. Predictions from existed various theoretical modes are compared with experimentally determined capacities of nailed connection per shear plane per nail and conclude that the load carrying capacity of connections with laterally load nails can be applied to accurately estimate using European yield models (EYMs). Furthermore, the model developed by Folz is capable of predicting the load-slip relationship of LBL nailed connections. The findings of this study will provide the scientific basis and useful information for the design and finite element numerical simulation of engineered bamboo structures containing LBL nailed connections and promote the rational use of bamboo resources in the field of civil engineering.