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（南京工業(yè)大學(xué)土木工程學(xué)院， 南京 211816）

［摘要］為研究齒板增強(qiáng)與螺栓數(shù)量等參數(shù)對(duì)木結(jié)構(gòu)螺栓連接承載力的影響，開(kāi)展了6組共36個(gè)螺栓連接試件的拉伸試驗(yàn)。主要分析了連接試件的破壞模式、極限荷載、初始滑移剛度和延性性能等，并將齒板增強(qiáng)螺栓連接試件與未增強(qiáng)試件進(jìn)行了對(duì)比分析。試驗(yàn)結(jié)果表明：增強(qiáng)齒板可以明顯減少被連接木構(gòu)件的橫紋劈裂破壞，木材和螺栓的受力性能得到充分發(fā)揮；齒板增強(qiáng)螺栓連接試件的極限荷載得到顯著提高，最高幅度可達(dá)100%，增強(qiáng)齒板的引入可顯著降低群栓效應(yīng)；對(duì)于延性而言，齒板增強(qiáng)連接試件的延性系數(shù)均有較大提升，并且隨著螺栓數(shù)量的增加，未增強(qiáng)螺栓連接試件的延性系數(shù)逐漸降低，而齒板增強(qiáng)螺栓連接試件的延性系數(shù)則呈現(xiàn)提高趨勢(shì)；此外，齒板增強(qiáng)與初始滑移剛度之間并無(wú)明顯的相關(guān)性。

［關(guān)鍵詞］木結(jié)構(gòu)； 螺栓連接； 齒板增強(qiáng)； 試驗(yàn)研究

中圖分類(lèi)號(hào)：TU366-3文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：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

*國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目（2017YFC0703506），國(guó)家自然科學(xué)基金項(xiàng)目(51878344)，江蘇省自然科學(xué)基金項(xiàng)目(BK20161550)。

作者簡(jiǎn)介：宋蕾蕾，碩士研究生，Email: 18751807580@163.com。