作者: André L. Zangiácomo , André L. Christoforo , Francisco A. R. Lahr
DOI: 10.1590/1809-4430-ENG.AGRIC.V36N3P566-570/2016
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摘要: This research aimed at estimating both longitudinal (E) and shear (G) elasticity moduli of round structural-sized beams made Pinus caribaea timber, verifying thus the validity G = E/ 20 relationship established by Brazilian standard ABNT NBR 7190: 1997 (Designing Wooden Structures). We tested twenty pieces green wood with average length, diameter conicity 750 cm, 30 cm 4%, respectively. Two static bending tests were applied three points each piece, being nondestructive using different distances between supports. In first trial, length (L/ d) was set as equal to 24; yet in second test, it 12. The estimated a successive use Timoshenko beam theory equation, which takes into account shearing stress effect on displacement calculations. results related through least square assessment method; thus, we could find 43. As result, observed that wooden are odds standards.