Characterizing engineering performance of bamboo-wood composite cross-laminated timber made from bamboo mat-curtain panel and hem-fir lumber
Characterizing engineering performance of bamboo-wood composite cross-laminated timber made from bamboo mat-curtain panel and hem-fir lumber
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DOI：
10.1016/j.compstruct.2021.113785
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发表时间：
2021-02
影响因子：
6.3
通讯作者：
Hao Li;B. Wang;Li-bin Wang;Peixing Wei;Yang Wei;Peng Wang
中科院分区：
文献类型：
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作者：
Hao Li;B. Wang;Li-bin Wang;Peixing Wei;Yang Wei;Peng Wang
在制造交叉层压木材（CLT）的全球工业化过程中，已经尝试使用当地木材品种。对于竹资源丰富而木材资源相对短缺的地区，利用竹木复合材料制造复合CLT（CCLT）具有很大的潜力。本文研究了两种新型的三层CCLT板结构，即竹席帘板和杉木板。在主强度方向和次强度方向上进行了平板弯曲和剪切试验，以研究其破坏模式、最大弯矩、弯曲刚度、弹性模量（莫伊）、弯曲强度、层间剪切强度以及具体的弯曲和剪切性能。此外，3层hem-fir胶合板层积材和CLT被用作对照。根据剪切比拟理论和修正伽玛理论计算了各板结构的有效弹性莫伊，并与实测的莫伊进行了比较。基于剪切比拟理论，研究了层板厚度对MoE的影响。结果表明，与其他类型的CCLT，新的CCLT表现出明显的板状正交强度特性。其理论莫伊与测量的莫伊一致，因为精度随面板结构而变化。通过改变新CCLT的板结构，如果一个强度方向的莫伊减小，则基于层特性，另一个强度方向的莫伊可以相应地增大。研究结果可为竹木复合板的设计和优化提供指导。
During the global industrialization process of manufacturing cross-laminated timber (CLT), attempts have been made to use local wood species. For areas rich in bamboo resources but relatively short in timber resources, the use of bamboo- and wood-based composites to manufacture composite CLT (CCLT) has great potential. In the present work, two new types of 3-ply CCLT panel structures constituting bamboo mat-curtain panel and hem-fir lumber were investigated. In the major and minor strength directions, flatwise bending and shear tests were conducted to investigate their failure modes, maximum bending moment, bending stiffness, modulus of elasticity (MOE), bending strength, interlaminar shear strength, and specific bending and shear performance. Moreover, 3-ply hem-fir glued-laminated timber and CLT were used as controls. The effective MOE of each panel structure was calculated according to shear analogy theory and modified gamma theory and then was compared to the measured MOE. Based on the shear analogy theory, the effect of the thickness of layers on the MOE of the panels was investigated. Results showed that unlike other types of CCLT, the new CCLT exhibited distinct plate-like orthogonal strength characteristics. Its theoretical MOE agreed well with the measured MOE as the accuracy changed with the panel structure. By changing the panel structure of the new CCLT, if the MOE of one strength direction was reduced, the MOE in the other strength direction could increase accordingly based on the layer characteristics. The results presented in this paper can provide a guidance for future design and optimization of bamboo-wood CCLT.