(1 上海市建筑科学研究院有限公司 上海市工程结构安全重点实验室， 上海 200032；2 上海理工大学环境与建筑学院， 上海 200093； 3 东南大学建筑设计研究院有限公司， 南京 210096)

［摘要］通过五个榫卯原木节点耐火极限试验，对透榫和单向直榫木节点的升温规律和耐火极限等进行了研究，主要考虑了节点类型和荷载比两个参数对其耐火极限的影响。结果表明：常温下单向直榫节点试件的承载力比透榫节点试件的承载力高；各测点温度随着受火时间的增加而升高，且停火之后温度下降较慢；测点离木截面表面距离越近，温度越高；相同类型的榫卯节点，随着荷载比的增加耐火极限减小；相同荷载比时，单向直榫节点耐火极限比透榫节点稍高。

［关键词］木建筑；单向直榫节点；透榫节点；耐火极限；荷载比

中图分类号：TU366-2，TU352-5文献标识码：A文章编号：1002-848X(2021)09-0098-05

Experimental study on fire endurance of one-way straight and through mortise-tenon timber joints

CHEN Lingzhu1, WANG Xin2, HAN Chongqing3, XU Qingfeng1, HU Xiaofeng3, WANG Zhengchang3

(1 Shanghai Key Laboratory of Engineering Structure Safety, Shanghai Research Institute of Building Sciences Co., Ltd., Shanghai 200032, China; 2 School of Environment and Architecture, Uninversity of Shanghai Science and Technology, Shanghai 200093, China; 3 Architects & Engineers Co., Ltd., Southeast University, Nanjing 210096, China)

Abstract:The temperature development law and fire endurance of one-way straight and through mortise-tenon timber joints were experimentally studied through fire endurance tests on five mortise-tenon timber joints, the effects of joint type and load ratio on their fire endurance were considered. Results show that the capacity of one-way straight mortise-tenon joint is higher than through mortise-tenon joints. Temperature increases with fire exposure time increasing and decreases very slowly after the fire stopped. The closer the measuring point to the surface of timber section is, the higher their temperature is. For the mortise-tenon joints of the same type, the fire endurance decreases with load ratios increase. For the mortise-tenon joints subjected to the same load ratios, the fire endurance of one-way straight mortise-tenon joint is slightly higher than through mortise-tenon joints. 

Keywords:timber building; one-way straight mortise-tenon joint; through mortise-tenon joint; fire endurance; load ratio

*国家自然科学基金青年科学基金（51808339），上海市工程结构安全重点实验室开放课题（2013-KF04）。

通信作者：许清风，博士，教授级高级工程师，Email: xuqingfeng73@163.com。