A sabedoria é vã, sem o amor. iii Dedico este trabalho à minha esposa pelo apoio e incentivo mesmo durante minhas ausências. iv AGRADECIMENTOS À minha esposa pelo incentivo e apoio durante minhas ausências Ao Professor Francisco Antonio Rocco Lahr pela orientação, incentivo, amizade e especial atenção dedicada. Ao professor Carlito Calil Júnio, pela, orientação, amizade e especial atenção dedicada. À Universidade Estadual de Maringá, ao Departamento de Engenharia Civil e aos colegas de trabalho pela oportunidade de desenvolver este trabalho. À Prefeitura do Município de Piracicaba e à Cia. Rio Grande de Reflorestamento, pela atenção durante a execução dos trabalhos de campo. À instituição de fomento, CAPES/PICDT pela concessão da bolsa de estudos, à FAPESP pelo apoio financeiro e à EESC/USP-SET-LaMEM por colocar à minha disposição os recursos necessários.

With the possibility of developing simple connections, of easy execution, strong and durable, the bonded-in steel bars with structural resins have started being applied to different situations, such as shear connectors in mixed wood-concrete structures. These connectors, when steel bars are inclined in relation to the grain, may work under axial forces transmitting more stiffness and strength to the connection. In this research, the pull out strength of bonded-in steel bars was evaluated, bent 45° in relation to wood grain, using epoxy resin Sikadur-32 Fluid. In random sample of round pieces of Eucalyptus citriodora (Corymbia citriodora), CCA treated, with six replications in each observation, and considering the variability of the parameters: natural wood mechanical properties; apparent density; bar diameters; adherence surface and the moisture content. Steel bars used were highly resistant ones (CA-50), with threaded surface solicited by axial force, under monotonic loadings, with two consecutive load cycles. From the analysis of variance (ANOVA), the increase in the moisture content promoted reductions in the values of the compressive strength. The estimate of the pullout strength by the multivariable regression model, the moisture content was considered not significant, increases in the area of anchoring strengths implied significant increases in anchorage strength values, and the interaction between the factors (anchoring area and moisture content) promoted reductions in the anchor strength values of the steel bars.

The development of standard methods and criteria for the stress grading of structural timber elements by non-destructive, fast and cheap bending tests, will allow producers, distributors and customers of such elements, have a better control of the marketed product. This paper analyzes the most suitable length of free span for stress grading of structural timbers, number of points to be assayed in each element, data precision and evaluation of cost of these tests for small business.

In Brazil is growing demand of short and medium span bridges not only in the new agriculture borders but also in the secondary roads in advanced regions. Traditional timber bridge not always meet the requirements of quality, they demand continuing maintenance and adequacy to actual heavy traffic. Mixed wood-concrete deck bridge arises as a viable alternative, because of its low Original Research Article construction cost, low maintenance and its high strength and stiffness. This paper presents the studies, design, execution and results from static load tests on wood-concrete deck bridge build with Corymbia citriodora wood specie logs, treated with CCA against xylophages organisms, reinforced medium strength concrete and steel bar connection bonde-in wood with epoxy resin, as shear connectors, were all used in construction system. Loaded tests were performed six months after the release of traffic. Results of the load tests indicate that the bridge performance is satisfactory.

In Brazil, don't have a standard code which rules the shear connector tests for mixed woodconcrete structures. Due to the excellent connector diversification, regarding shape, stiffness, limit strength and the placement in the structural member; and variables as: spaces between connectors, spaces between connectors and the member ends of wood or concrete, dimension Original Research Article