刘建辉, 柏亚双, 曹龙, 等. 木材试件长度对其顺纹抗压强度性能的影响[J]. 西南林业大学学报(自然科学), 2024, 44(4): 186–192. DOI: 10.11929/j.swfu.202305039
引用本文: 刘建辉, 柏亚双, 曹龙, 等. 木材试件长度对其顺纹抗压强度性能的影响[J]. 西南林业大学学报(自然科学), 2024, 44(4): 186–192. DOI: 10.11929/j.swfu.202305039
Liu Jianhui, Bai Yashuang, Cao Long, Xu Guolin, Geng Wenqing. Study on the Influence of Wood Specimen Length on Its Compressive Strength Performance Along the Grain[J]. Journal of Southwest Forestry University, 2024, 44(4): 186-192. DOI: 10.11929/j.swfu.202305039
Citation: Liu Jianhui, Bai Yashuang, Cao Long, Xu Guolin, Geng Wenqing. Study on the Influence of Wood Specimen Length on Its Compressive Strength Performance Along the Grain[J]. Journal of Southwest Forestry University, 2024, 44(4): 186-192. DOI: 10.11929/j.swfu.202305039

木材试件长度对其顺纹抗压强度性能的影响

Study on the Influence of Wood Specimen Length on Its Compressive Strength Performance Along the Grain

  • 摘要: 为探究试件长度对针叶材和阔叶材顺纹方向轴压力学性能变化规律的影响,基于白蜡、冷杉和云南松3种木材的不同尺寸试件开展轴心受压试验,采用Weibull最弱链理论计算3种木材抗压强度长度尺寸效应系数,使用测试参数借助有限元软件模拟木试件轴压力学行为。结果表明:木材顺纹抗压强度和峰值应变有显著尺寸效应,试件长度从40 mm增加至80 mm时,3种木材试件平均抗压强度下降幅度分别为4.10%、7.19%、5.78%,平均峰值应变下降幅度分别为46.38%、70.07%、33.49%;白蜡、冷杉和云南松抗压强度长度尺寸效应系数(分别为0.06、0.11、0.09)可实现测试尺寸不同时3种木材测试抗压强度相互转换,使用该系数调整长度为100 mm试件的抗压强度,误差仅为0.76%、1.9%、1.06%;基于OpenSees纤维截面模型,可较好地模拟木构件轴心受压时非线性行为,但需考虑尺寸效应对木材力学参数的影响。

     

    Abstract: The axial compression test was carried out based on 3 different size specimens of Fraxinus chinensis, Abies fabri and Pinus yunnanensis to explore the effect of specimen length on the variation of axial compression mechanical properties of coniferous and broadleaf woods along grain direction. The Weibull weakest link theory was used to calculate the length size effect coefficients of the compressive strength of 3 kinds of wood. The finite element software was used to simulate the axial pressure behavior of the wood specimen with the tested parameters. The results showed that the tested wood had a significant size effect on the compressive strength and peak strain of wood along the grain. When the specimen length increased from 40 mm to 80 mm, the average compressive strength of 3 wood specimens decreased by 4.10%, 7.19% and 5.78%. In contrast, the average peak strain decreased by 46.38%, 70.07% and 33.49%. The length size effect coefficients of compressive strength of F. chinensis, A. fabri and P. yunnanensis(0.06, 0.11 and 0.09, respectively) obtained based on the Weibull weakest link theory can be used for interconversion between the compressive strength tests of 3 woods with different test sizes. Based on the above coefficients to adjust the compressive strength of a specimen with a length of 100 mm, the error is only 0.76%, 1.9% and 1.06%. Based on the OpenSees fiber cross-section model, the nonlinear behavior of wood members under axial compression can be well simulated, but the impact of size effects on wood mechanical parameters needs to be considered.

     

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