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Title

THE EFFECT OF ALTITUDE ON BENDING CREEP BEHAVIOR HORNBEAM (CASE STUDY, NOWSHAHR MESHELAK BRANCH)

Pages

 Start Page 387 | End Page 399

Abstract

 This study aimed to investigate the effect of ALTITUDE on the bending creep behaviour of HORNBEAM lumber (Carpinus betuluse). For this purpose, 9 HORNBEAM trees were selected from three different ALTITUDEs (400, 800 and 1100m. a.s.l.) from forestry projects of Meshelak Nowshahr. 54 clear samples were cut from the mature wood at breast height. The prepared samples (dimensions: 2.5×2.5×41cm) were conditioned in a room at temperature of 20oC and relative humidity of 65 %. After 3 weeks of conditioning, RELATIVE CREEP and CREEP MODULUS were measured using the four points flexural creep test in 20% maximum of deflection load. The results indicated that the effect of ALTITUDE on creep parameters were significant. The maximum and the minimum RELATIVE CREEP were, respectively, observed in 800 and 400m. a.s.l. and the maximum and the minimum CREEP MODULUS were, respectively, observed in 400 and 800m. a.s.l. Analysis of variance (ANOVA) indicated that the ALTITUDE has significant effect on the flexural strength and modulus of elasticity, which in turn caused a decrease in the creep parameters.

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