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MORITANI, F. Y. Proposal for strength classes for structural timber: Eucalyptus urograndis, Pinus taeda e Schizolobium amazonicum (Paricá). 2018. 176f. Dissertation (MSc. in Civil Engineering (Structures)) – Department of Structural Engineering, São Carlos School of Engineering, University of São Paulo, São Carlos, 2018. Timber from reforestation species are been used for civil construction, considering the restrictions on the large-scale use of tropical species. The mechanical properties of reforestation species are influenced by the drying and growth characteristics, due to the fast growth and the inherent characteristics of the trees. The Brazilian standard ABNT NBR 7190: 1997 is under review and among the items is being discussed by the scientific committee are the methods of visual and mechanical grading and the full-size testing for structural elements. The aim of this work was to propose strength classes of three timber species from reforestation species (Eucalyptus urograndis, Pinus taeda and Schizolobium amazonicum Paricá) for structural use. Grading tests based on the visual and mechanical characteristics were performed and compared with the strength and stiffness properties making possible to estimate the mechanical properties by of the strength classes assigned in the visual and mechanical grading. The results were statistically tested to evaluate the mechanical properties for the strength classes of each species and to compare them with the foreign and international standards. According to the results obtained and the statistical analysis three strength classes were proposed for Eucalyptus urograndis, two strength classes for Schizolobium amazonicum (Paricá) and Pinus taeda.

Proposta de classes de resistência para peças estruturais de madeira: &lt;i&gt;Eucalyptus urograndis&lt;/i&gt;, &lt;i&gt;Pinus taeda&lt;/i&gt; e &lt;i&gt;Schizolobium amazonicum&lt;/i&gt; (Paricá)