Evaluation of the Shear Performance of Douglas-Fir Wood at Elevated Temperatures

被引:1
|
作者
Zhang, Lingfeng [1 ]
Li, Qianyi [1 ]
Liu, Weiqing [2 ]
He, Qian [1 ]
Liu, Yan [1 ]
Guo, Kai [3 ]
机构
[1] Yangzhou Univ, Coll Civil Sci & Engn, Yangzhou 225127, Peoples R China
[2] Nanjing Tech Univ, Adv Engn Composites Res Ctr, Nanjing 211816, Peoples R China
[3] Politecn Milan, Dept Architecture Built Environm & Construct Engn, Piazza Leonardo da Vinci 32, I-20133 Milan, Italy
基金
中国国家自然科学基金;
关键词
Douglas-fir; wood; elevated temperature; shear; digital image correlation (DIC); MECHANICAL-PROPERTIES; CORE;
D O I
10.3390/ma15238386
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Shear fracture frequently occurs in timber beams and panels subjected to transverse loads. At elevated temperatures, wood will undergo complex physical and chemical processes which significantly affect the shear properties. In this paper, the v-notched Douglas-fir specimens with three different shear planes: (a) Radial-Tangential (RT); (b) Radial-Longitudinal (RL), and (c) Longitudinal-Radial (LR), were fabricated and tested under the elevated temperatures from 20 degrees C to 180 degrees C. The digital image correlation (DIC) technique was used to measure the shear strain. It was found that the shear plane had a significant effect on the failure modes, shear strength, and shear modulus. The shear strength and shear modulus generally decreased with the increase of temperature. However, the shear strength was significantly improved when the hardening of the dry lignin occurred between 100 degrees C and 140 degrees C. Moreover, the design curve for the shear strength in Eurocode 5 is conservative for all the specimens with different shear planes.
引用
收藏
页数:10
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