抗震型楼盖竹木复合板钉连接抗剪性能研究  

Shear Performance of Nail Connection in Seismic Diaphragm Using Bamboo-Wood Composite Boards

作　　者：张德志 王朝晖[1] 赵弘博 宋炜德 任海青[1] 段新芳[1] 陆铜华 ZHANG Dezhi;WANG Zhaohui;ZHAO Hongbo;SONG Weide;REN Haiqing;DUAN Xinfang;LU Tonghua(Research Institute of Wood Industry,Chinese Academy of Forestry,Beijing 100091,China;TREEZO Investment Group Co.,Ltd.,Hangzhou 311100,Zhejiang,China)

机构地区：[1]中国林业科学研究院木材工业研究所,北京100091 [2]千年舟新材科技集团股份有限公司,浙江杭州311100

出　　处：《木材科学与技术》2024年第6期47-54,共8页Chinese Journal of Wood Science and Technology

基　　金：中央级公益性科研院所基本科研业务费专项基金“抗震木结构技术研究与应用”(CAFYBB2020SY046);国家林业和草原局重点研发项目“覆面用定向刨花板木结构剪力墙性能及其抗震技术研究”(GLM[2021]08号)。

摘　　要：现代木结构楼盖面板通过钉连接固定框架材,面板钉连接抗剪性能是决定楼盖刚度的主要因素,对于木结构抗震性能具有重要影响。以28 mm厚A级竹木复合板为面板,兴安落叶松(Larix gmelini)规格材为框架材,采用两种规格圆钢钉制作钉连接抗剪试件,同时选择18 mm厚定向刨花板(OSB/3型)为面板制作对照钉连接试件,并进行单调加载试验,分析面板材料、钉规格尺寸及加载方向对钉连接抗剪性能的影响。结果表明:竹木复合板钉连接试件顺纹方向抗剪初始刚度和延性系数均大于横纹,而最大荷载相反;定向刨花板钉连接试件顺纹与横纹差异不明显。当钉直径增加,竹木复合板钉连接主要抗剪性能提高,而刚度和延性系数降低;为了减少框架材开裂的风险,CN75钉更适用于28 mm厚竹木复合板面板与框架材连接。竹木复合板CN75钉连接试件与对照OSB钉连接试件相比,容许荷载高44%,初始刚度增加1倍以上,抗剪破坏模式没有面板贯穿现象,仅在剪切部位销槽压溃后出现钉弯曲拔出现象。Hassanieh模型能较好地模拟竹木复合板钉连接抗剪荷载-位移关系,可为竹木复合板钉连接节点和楼盖结构分析提供基本数据。A diaphragm board fastened to the frame by nails or screws in modern wood structure is the main factor determining the diaphragm structure stiffness,which significantly impact the seismic performance of the whole wood structure.In this study,the single shear specimens of nail joints were fabricated with the bamboo-wood composite board(BWC)and oriented strand board(OSB)on larch dimensional-lumber frame.The monotonic loading tests were carried out to investigate the effects of nail size,panel material,and grain direction on the nail joints properties.The results showed that the initial shear stiffness and ductility coefficient of nail joints of BWC along grain direction were greater than those across grain direction,however these scenarios reversed at the maximum load.There was no obvious difference between grain direction in OSB.When the nail diameter increased,the main shear performance of BWC nail joints increased,while the stiffness and ductility coefficients decreased.To minimize the risk of cracking of the larch wood frame,CN75 nails were recommended for the connection of the 28 mm thick BWC to the frame.The allowable load was 44%higher than that of the 18 mm-thick OSB nail joints.Furthermore,the initial stiffness was one time higher than that of 18 mm thick OSB;The shear failure mode of the BWC nail connection did not have the phenomenon of pulling through the board,and the nails mainly crush the wood and were bent to pull out at the shear plane.The Hassanieh model can simulate the shear load displacement curve of BWC,which provides prime data for structural analysis of BWC nail joints.

关 键 词：竹木复合板 钉连接 抗剪性能 抗震型楼盖 

分 类 号：TU366.2[建筑科学—结构工程]