原木弯曲度对顺纹抗压强度影响的研究

›› 1991, Vol. 27 ›› Issue (6): 622-629.

原木弯曲度对顺纹抗压强度影响的研究

胡慕任吴淑熙

中国林业科学研究院热带林业研究所；海南建筑试验中心

收稿日期:1990-12-30 修回日期:1900-01-01 出版日期:1991-11-25 发布日期:1991-11-25

EFFECT OF BOWING RATE OF LOG ON THE COMPRESSION STRENGTH PARALLEL TO GRAIN

Hu Muren,Wu Shuxi

The Research Institute of Tropical Forestry, CAF;Constructional Test Centre of Hainan Province

Received:1990-12-30 Revised:1900-01-01 Online:1991-11-25 Published:1991-11-25

摘要/Abstract

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)

关键词: 顺纹抗压强度, 弯曲度, 弯曲度影响系数

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)

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

胡慕任吴淑熙. 原木弯曲度对顺纹抗压强度影响的研究[J]. , 1991, 27(6): 622-629.

Hu Muren;Wu Shuxi. EFFECT OF BOWING RATE OF LOG ON THE COMPRESSION STRENGTH PARALLEL TO GRAIN[J]. , 1991, 27(6): 622-629.