高性能杨木重组木顺纹抗拉强度尺寸效应研究OA

High-performance wood scrimber,as a novel engineered wood product,exhibits significant potential for applications in construction due to its excellent mechanical properties and dimensional stability.However,the size effect on its mechanical strength remains understudied.This study focused on high-performance poplar wood scrimber,preparing specimens with varying cross-sectional areas and tensile lengths to test their tensile strength parallel to grain.The strength percentiles were analyzed using a lognormal distribution,and size effect coefficients were determined based on the weakest link theory.Results indicated that the tensile strength of high-performance poplar wood scrimber exhibited a significant size effect with changes in cross-sectional area and tensile length.The size effect coefficient of tensile length(kL)was greater than that of cross-sectional area(kA),and both increase linearly with the strength percentile(Pf),satisfying the relationships kL=0.056+0.046Pf and kA=0.038+0.053Pf.Based on the differences in size effect coefficients of tensile length and cross-sectional area,a method for calculating reduction factor of tensile strength was proposed,taking into account the size variations in both tensile length and cross-sectional area of high-performance poplar wood scrimber.