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作 者 ：胡慕任 吴淑熙

期 刊 ：林业科学 1991年 27卷 6期 页码：622-629

关键词：顺纹抗压强度；弯曲度；弯曲度影响系数；

Keywords:Compression strength parallel to grain, Bowing rate, Influence coefficient of bowing rate,

摘 要 ：弯曲原木的顺纹抗压强度,随弯曲度或构件长细比的增大而降低。弯曲度对强度的影响系数,树种间有所不同,与弯曲度呈曲线关系,可按公式K=(98d)/(785h+98d)×α计算。式中α为弯曲度C的函数,根据各树种的试验资料分别确定取值。本试验结果: C>2.5%时:隆缘桉α=C^{((0.61-0.04C)});湿地松α=C^{((0.22+1.42/C)}) C<2.5%时:隆缘桉α=ln(1.8+1.22C);湿地松α=ln(2.1+2C)

Abstract:An increase in the bowing rate or slendereness raito of the member resulted in a decrease in the compression strength parallel to grain of the crooked log. The influence coefficient of the bowing rate on the strength between the species was different and showed a curve relation. It may be calculated by a formula of K=98d/(785h+98d)×a, where a is a function of the bowing rate C. The value of a can be confirmed by testing of different species. In this trial, the results are:In the case of C>2.5%, for Eucalyptus exserta a=C(0.61-0.04C), and for Pinus elliottii a=C(0.22+1.42/C). When C<2.5%, for E. exserta a=ln(1.8+1.22C), and for p. elliottii a=ln(2.1+2C)

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