火灾高温下木结构植筋连接的拉拔性能试验  

Pull-out experiments of glued-in rod joints in timber structures under high temperatures in fire

作　　者：罗立权 杨会峰[1] 刘伟庆[1] 许清风[3,4] LUO Liquan;YANG Huifeng;LIU Weiqing;XU Qingfeng(College of Civil Engineering,Nanjing Tech University,Nanjing 211800,China;College of Hydraulic and Civil Engineering,Xinjiang Agricultural University,Urumuqi 830052,China;Shanghai Key Laboratory of New Technology Research on Engineering Structure,Shanghai 200032,China;Shanghai Research Institute of Building Sciences,Shanghai 200032,China)

机构地区：[1]南京工业大学土木工程学院,江苏南京211800 [2]新疆农业大学水利与土木工程学院,新疆乌鲁木齐830052 [3]上海市工程结构新技术重点实验室,上海200032 [4]上海市建筑科学研究院,上海200032

出　　处：《南京工业大学学报（自然科学版）》2020年第1期115-123,共9页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家自然科学基金(51578284);上海市工程结构安全重点实验室开放课题(2017-KF09)

摘　　要：为了研究木结构植筋连接在火灾高温下的受力性能,本文对10组44个胶合木植筋试件分别开展了室温和高温下的拉拔试验研究,深入分析了胶黏剂种类和植筋杆胶层界面温度对植筋承载力的影响,研究了试验现象、植筋承载力和滑移性能。试验结果表明:在室温下,传统环氧植筋胶与改性环氧植筋胶的受力性能相差不大;随着植筋杆胶层界面温度的升高,改性环氧植筋胶的优势越发明显,对于传统环氧植筋胶试件,当植筋杆胶层界面温度在50℃时拉拔承载力下降了约50%,植筋杆胶层界面温度超过80℃时拉拔承载力只有室温时的15.4%,而对于本文提出的改性环氧植筋胶,当植筋试件的植筋杆胶层界面温度在100℃以内时,仍能保持室温极限荷载50%的承载力;在室温时改性环氧植筋胶植筋节点的初始刚度略大,但在高温下改性环氧植筋胶植筋连接的初始刚度显著提高;此外,改性环氧植筋胶试件相对于传统环氧植筋胶试件,其在高温情形下的植筋杆滑移也显著减小。To investigate the load carrying capacity of glued-in rod joints under high temperatures in fire,the pull-out tests of 44 specimens in 10 groups were carried out at room temperature and high temperatures respectively.The effects of adhesive type and interfacial temperature between the bar and the glue-line on the load carrying capacity of the joints were discussed.The test phenomenon,load carrying capacity and slip behavior of the joints were considered.Results showed that the load carrying capacity of traditional epoxy adhesive and modified epoxy adhesive were similar at room temperature,but with the increase of the interfacial temperature,the advantage of modified epoxy became more obvious.For traditional epoxy adhesive specimens,when the interfacial temperature was 50℃,the load carrying capacity decreased by more than 50%,while the interfacial temperature reached 80℃,and the load carrying capacity was only 15.4%of that at room temperature.As a comparison for modified epoxy adhesive specimens,when the interfacial temperature was within 100℃,it was still remained 50%of the ultimate load as at room temperature.Moreover,when compared to the joints with traditional epoxy adhesive,the initial stiffness of the glued-in rod joints with modified epoxy resin was significantly increased at high temperatures,and the slip value of the modified epoxy resin specimens was also obviously reduced.

关 键 词：木结构 植筋连接 耐高温性能 改性环氧胶 抗拔承载力 

分 类 号：TU366.3[建筑科学—结构工程] TU398+6