Experimental Analysis of Ancient Timber Beam with Dovetail Joint Restraint under Environmental Temperature Effect

被引：0
|
作者：
Bai X. [1 ,2 ]
Yang N. [1 ]
Chang P. [1 ]
机构：
[1] School of Civil Engineering, Beijing Jiaotong University, Beijing
[2] Central Research Institute of Building and Construction Co, Ltd, Beijing
来源：
Yang, Na (nyang@bjtu.edu.cn) | 2020年 / Hunan University卷 / 47期
基金：
国家自然科学基金重点项目; 中国国家自然科学基金;
关键词：
Ancient timber beam; Dovetail joint; Environmental temperature effect; Extra strain; Strain parallel to grain; The tension and compression stiffness;
D O I：
10.16339/j.cnki.hdxbzkb.2020.03.008
中图分类号：
学科分类号：
摘要：
An unrestrained timber beam and a dovetail joint timber beam are placed in Lasa, and non-load test and step loading test are carried out, respectively, to study the strain parallel to grain of the timber beam under environmental temperature effect. According to the test data, the elasticity modulus parallel to grain of the wood, the tension and compression stiffness and rotation stiffness of the dovetail joints are identified. Considering the environmental temperature effect, the parameters are determined as variables related to the temperature variations. According to the construction features of the dovetail joint, the tension and compression stiffness in the temperature increasing stage and temperature decreasing stage are different. The influences of upper load and boundary conditions on the strain parallel to grain are analyzed. The results show that the strain variations of unrestrained beam under environmental temperature effect is unconcerned with the top load, and the strain variations of restrained beam increase along with the environmental temperature. The extra strain is induced by the second order moment of the counterforce at the beam end, which increases along with the temperature and the upper load. Finally, according to the theoretical formula of extra strain, the measured value and calculated value matched well, which indicates that the theoretical formula of the extra strain is rational. © 2020, Editorial Department of Journal of Hunan University. All right reserved.
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页码：63 / 72
页数：9
相关论文
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