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参照GB 50329-2002《木结构试验方法标准》对经过目测分级的2种尺寸(截面尺寸为40 mm×90 mm和40 mm×140 mm,长度均为4 000 mm)兴安落叶松规格材进行了静态弯曲试验,测试了其抗弯弹性模量(MOE)和抗弯强度(MOR)。结果表明:40 mm×90 mm和40 mm×140 mm两种规格材Ⅰc、Ⅱc和Ⅲc等级的MOE平均值分别为15.0、13.0、13.2和15.7、14.0、15.6 GPa;40 mm×90 mm规格材Ⅰc、Ⅱc和Ⅲc等级MOR的特征值(5%分位值)分别为37.5、26.72和24.85 MPa,40 mm×140 mm规格材Ⅰc、Ⅲc等级MOR的特征值(5%分位值)为27.95和24.2 MPa;Ⅰc等级的力学强度特征值明显高于Ⅱc和Ⅲc等级;落叶松规格材的MOR、MOE的相关性较好。落叶松规格材足尺弯曲力学性质研究可以为国产结构材的分级技术提供依据,也为国产结构材的设计应用提供参数。
According to GB 50329-2002 Standard for Testing of Wood Structures, two specifications (40 mm × 90 mm in cross section and 40 mm × 140 mm in cross section and 4 000 mm in length) of Larix gmelinii Static Bending Tests were tested for flexural modulus of elasticity (MOE) and flexural strength (MOR). The results showed that the average MOE of Ⅰc, Ⅱc and Ⅲc grades of 40 mm × 90 mm and 40 mm × 140 mm were 15.0, 13.0, 13.2 and 15.7, 14.0 and 15.6 GPa respectively; and the thickness of 40 mm × 90 mm The eigenvalues (5% quantiles) of Ⅰ, Ⅱc and Ⅲc grade MOR were 37.5, 26.72 and 24.85 MPa, respectively. The eigenvalues (5% quantile) of 40 mm × 140 mm gauge material Ⅰc and Ⅲc grade MOR were 27.95 And 24.2 MPa, respectively. The mechanical strength of Ⅰc grade was significantly higher than that of Ⅱc and Ⅲc. The correlation between MOR and MOE of larch material was better. The research on the mechanical properties of full-scale bending of larch can provide the basis for the grading technology of domestic structural materials, and also provide the parameters for the design and application of domestic structural materials.