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本研究采用大尺寸构件为试件,较好地反映构件实际抗拉工作.分别给出了不同相对偏心φ下的φ-K回归方程,并得出φ>0.35时.Ψ对K几无影响的结论.文中分析了木节生长过程中纤维的变化,认为弦切板径切面上的纤维倾斜和割断对抗拉强度影响最大,过去从未考虑此影响,本文计入这一客观事实,利用Hoffman复合材料强度理论,结合木节对截面削弱的假定给出了木节对板材强度折减系数K_i的计算公式,与试验结果吻合较好.
In this study, large-scale components are used as specimens to better reflect the actual tensile behavior of the components. The φ-K regression equations for different relative eccentricity φ are given respectively, and when φ>0.35 is obtained, Ψ has little effect on K. The paper analyzes the changes in the fiber during the growth of the knot, and considers that fiber tilting and cutting on the chopped section of the chord board has the greatest impact on tensile strength. This effect has never been considered in the past. This article takes into account this objective fact and uses Hoffman. The strength theory of composite materials, combined with the assumption that the section of the section weakens the section, gives the formula for the strength reduction factor K_i of the section of the section, which is in good agreement with the experimental results.