The
current study evaluated the estimate of the longitudinal (E) and transversal
(G) elasticity modulus of the round structural beams of Pinus caribaea timber
in order to verify whether the relationship between the two modules of the
Brazilian Standard ANBT NBR 7190 is actually reliable for this species of wood.
Twenty pieces of green wood were tested with an average length, diameter and
conicity of 750 cm, 30 cm and 4 percent , respectively, to conduct such an
assessment. At three points of each object, two static bending tests were
applied, being nondestructive and using distinct distances between supports.
The
relationship of length and diameter relationship (L / d) was set to be equal to
24 in the first test; however, it was set to 12 in the second test. A
successive use of the Timoshenko beam theory equation, which takes into account
the shearing stress effect on displacement measurements, calculated the
elasticity moduli. The results of the tests were connected by means of the
least square evaluation process. G = E/43 was the relation found between
elasticity moduli.
Author(s) Details
André Luis Zangiácomo
Department
of Engineering, Federal University of Lavras, Lavras/MG, Brazil.
Vinicius Borges de Moura Aquino
Araguaia
Engineering Institute, Federal University of Southern and Southeastern Pará
(UNIFESSPA), Santana do Araguaia/PA, Brazil.
André Luis Christoforo
Department
of Civil Engineering (DECiv), Federal University of São Carlos, São Carlos/SP,
Brazil.
Francisco Antonio Rocco Lahr
View Book :- https://bp.bookpi.org/index.php/bpi/catalog/book/308
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