INFLUENCE OF STIFFNESS RELATED TO THE C40 STRENGTH CLASS OF THE HARDWOOD GROUP ESTABLISHED BY THE BRAZILIAN STANDARD IN THE DESIGN OF TIMBER STRUCTURES

WOOD RESEARCH 66(4) 2021 Pub Date : 2021-09-09 DOI:10.37763/wr.1336-4561/66.4.582594

F. Lahr, V. Aquino, F. Arroyo, H. Santos, S. A. M. Silva, A. R. V. Wolenski, Carlos Maviael de Carvalho, J. Almeida, A. Christoforo

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引用次数: 1

Abstract

The Brazilian standard ABNT 7190 (1997) establishes the strength classes C20, C30, C40 and C60 for the proper framework of the different wood types in the group of hardwoods. Associated with the strength class, which is based on the compressive strength characteristic value parallel to the fibers (fc0,k), the standard stipulates the respective values representing the stiffness (Ec0), with 19500 MPa being the reference value for the class C40, essential variables in structural design. For being the C40 class is the one with the greatest amplitude (20 MPa), it is possible that the value 19500 MPa is not the best representation of stiffness. This work aimed to verify the representativeness the stiffness value established by the Brazilian standard for C40 wood. The result obtained from the average confidence interval indicates the value of 14110 MPa as being the most representative, which may imply structures that are supposedly more rigid than they really are.

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巴西标准规定的硬木组c40强度等级对木结构设计的刚度影响

巴西标准ABNT 7190(1997)为硬木组中不同木材类型的适当框架建立了C20、C30、C40和C60的强度等级。与强度等级相关的是，该标准以平行于纤维的抗压强度特征值(f0,k)为基础，规定了各自的值来表示刚度(Ec0)，其中19500 MPa是C40等级的参考值，这是结构设计中的重要变量。由于C40级是振幅最大的一种(20 MPa)，因此19500 MPa的值可能不是刚度的最佳代表。本工作旨在验证巴西C40木材标准建立的刚度值的代表性。从平均置信区间得到的结果表明，14110 MPa的值是最具代表性的，这可能意味着假设的结构比实际的刚性更强。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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WOOD RESEARCH 66(4) 2021

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