No abstract

Neste trabalho, apresenta-se e se discute a análise teórica e experimental de vigas de madeira, reforçadas com bambu. Para tanto, o comportamento mecânico de cinco vigas mistas e duas de madeira foi estudado. A parte interna das vigas mistas foi constituída de Pinus elliottii e o reforço de bambu Dendrocalamus giganteus; este reforço foi disposto tanto na parte inferior como na superior das vigas, além de analisadas diferentes espessuras de reforço. São apresentadas curvas carga vs. deslocamentos e carga vs. deformação. Observou-se aumento da ordem de 50% na rigidez das vigas de Pinus elliottii, quando da presença do reforço de bambu. Finalmente, um estudo numérico em que se utilizou o método dos elementos finitos é apresentado, observando-se boa correlação entre os valores numéricos e experimentais.

A B S T R A C TThis paper presents results from a continuing research program that aims to investigate the behaviour of highstrength concrete columns and to recommend some design procedures to Brazilian Building Code. The specific current work deals with experimental behaviour of steel fibre highstrength concrete columns (SFHSCC) confined with low ratios of rectangular ties under concentric compression. Twenty-four small-scale SFHSCC were tested under concentric loading and their behaviour were examined and compared with the behaviour of two normal-strength concrete columns. The variables studied in this work were the concrete strength, amount of transversal reinforcement and volumetric fraction of steel fibre. The results indicated that steel fibre not only improves the columns ductility, but also avoids the premature concrete cover spalling. Further, to improve the ductility of high-strength concrete column, the used amount of steel reinforcement is the same when tie confinement or steel fibre is applied. RI~SUMI~

Same Bamboos species have mechanical properties compatible with construction material. Despite this, their low shear strength, the presence of nodes in their culms and their circular geometry inhibit the expansion of the use of this material as construction material. One technique that can solve this problem is Glued Laminated Bamboo (GLB). Based on these findings, this paper aims to evaluate the physical and mechanical properties of Glued Laminated Bamboo of the species Dendrocalamus giganteus. Two glues were analyzed: resorcinol-formaldehyde (CASCOPHEN, commercial name) and polyvinyl acetate (CASCOREZ, commercial name). The following physical and mechanical characterization tests were performed on Glued Laminated Bamboo: water absorption, density, compression parallel to the fiber, tension parallel to the fiber, shear parallel to the glue layer, shear parallel to the bamboo fibers and bending. The results, analyzed using statistical models, showed that the Glued Laminated Bamboo has physical and mechanical properties comparable to those of hardwoods.