国产日本落叶松正交胶合木抗弯弹性模量评价方法

龚迎春; 田兆鹏; 徐俊华; 武国芳; 任海青

doi:10.19455/j.mcgy.20180301

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国产日本落叶松正交胶合木抗弯弹性模量评价方法
Evaluation Methods of Bending MOE of Cross-Laminated Timber Made from Domestic Japanese Larch Lumber
1. 中国林科院木材工业研究所
2. 西南林业大学设计学院
2018年32卷第3期页码：1-4
DOI： 10.19455/j.mcgy.20180301

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[1]龚迎春,田兆鹏,徐俊华,武国芳,任海青.国产日本落叶松正交胶合木抗弯弹性模量评价方法[J].木材工业,2018,32(03):1-4.

GONG Ying-chun, TIAN Zhao-peng, XU Jun-hua, et al. Evaluation Methods of Bending MOE of Cross-Laminated Timber Made from Domestic Japanese Larch Lumber[J]. China Wood Industry, 2018,32(3):1-4.
[1]龚迎春,田兆鹏,徐俊华,武国芳,任海青.国产日本落叶松正交胶合木抗弯弹性模量评价方法[J].木材工业,2018,32(03):1-4. DOI： 10.19455/j.mcgy.20180301.

GONG Ying-chun, TIAN Zhao-peng, XU Jun-hua, et al. Evaluation Methods of Bending MOE of Cross-Laminated Timber Made from Domestic Japanese Larch Lumber[J]. China Wood Industry, 2018,32(3):1-4. DOI： 10.19455/j.mcgy.20180301.

摘要

采用国产日本落叶松锯材制备正交胶合木（CLT）,分别采用静力法和纵向振动法测定CLT抗弯弹性模量,并采用剪力类比法预测等效抗弯刚度,分析无损检测技术和理论计算的可行性与准确性。结果表明:静力法测试时随着跨高比的增加,CLT的抗弯弹性模量呈现递增趋势,建议跨高比≥24;动态抗弯弹性模量均高于静态抗弯弹性模量,相对误差在10%以内;剪力类比法能够有效预测CLT等效抗弯刚度,预测值和实测值相对误差在±5%以内。

Abstract

Domestic Japanese larch lumber was used to prepare cross-laminated timber（CLT） samples. Modulus of elasticity（MOE） was tested using a static method and longitudinal vibration. Shear analogy was also used to predict effective bending stiffness. Feasibility and accuracy of nondestructive testing technology and theoretical calculation were analyzed.Testing results showed that:1)MOE was improved by increasing the span/depth ratio and should be more than 24;2)Dynamic MOE was higher than static MOE with less than 10%of relative error;3)Effective bending stiffness of the CLT samples was predicted by shear analogy with less than 5%of relative error between predicted and measured values.