（南京工业大学土木工程学院， 南京 211816）

［摘要］为研究齿板增强与螺栓数量等参数对木结构螺栓连接承载力的影响，开展了6组共36个螺栓连接试件的拉伸试验。主要分析了连接试件的破坏模式、极限荷载、初始滑移刚度和延性性能等，并将齿板增强螺栓连接试件与未增强试件进行了对比分析。试验结果表明：增强齿板可以明显减少被连接木构件的横纹劈裂破坏，木材和螺栓的受力性能得到充分发挥；齿板增强螺栓连接试件的极限荷载得到显著提高，最高幅度可达100%，增强齿板的引入可显著降低群栓效应；对于延性而言，齿板增强连接试件的延性系数均有较大提升，并且随着螺栓数量的增加，未增强螺栓连接试件的延性系数逐渐降低，而齿板增强螺栓连接试件的延性系数则呈现提高趋势；此外，齿板增强与初始滑移刚度之间并无明显的相关性。

［关键词］木结构； 螺栓连接； 齿板增强； 试验研究

中图分类号：TU366-3文献标识码：A文章编号：1002-848X(2020)05-0033-05

Experimental study on load-carrying behavior of bolted joints reinforced with nail plates for timber structures

Song Leilei， Wu Jintao， Yang Huifeng， Tang Zhouyu， Zeng Tailin， Li Zefu， Li Jiayu

(College of Civil Engineering, Nanjing Tech University, Nanjing 211816,  China)

Abstract:To investigate the influence of the nail plate reinforcement and the number of bolts on the load-carrying behavior of bolted joints in timber structures, tensile experiments of 36 bolted joint specimens in 6 groups were carried out. The failure modes, ultimate loads, initial slip stiffness, and the ductility were mainly analyzed. A comparative analysis was made between bolted joint specimens reinforced with nail plates with unreinforced specimens. Experimental results show that the introduction of the nail plate reinforcement can remarkably reduce the splitting failure of the connected timber members, and the mechanical behaviors of both timber and bolts are fully utilized; the ultimate load of the bolted joint specimens with nail plate reinforcement obtain a significant enhancement up to 100%, and the introduction of the nail plate reduces the bolt group effect evidently; the ductility coefficient of the bolted joint specimens reinforced with nail plates decreases gradually in terms of the ductility, and with the increase of the number of bolts, the ductility coefficient of the unreinforced bolted joint specimens decreases and the ductility coefficient of the bolted joint specimens reinforced with nail plates shows a increasing trend; in addition, there is no obvious correlation between the reinforcement with the nail plate and the initial slip stiffness.

Keywords:timber structure; bolted joint; nail plate reinforcement; experimental study

*国家重点研发计划项目（2017YFC0703506），国家自然科学基金项目(51878344)，江苏省自然科学基金项目(BK20161550)。

作者简介：宋蕾蕾，硕士研究生，Email: 18751807580@163.com。