Comparison of Anchorage Strength of Bonded-In Steel Bars with Epoxy Resin, Varying the Superficial Treatments and Moisture after Bonding, Using Corymbia citriodora Wood
Julio César Pigozzo
Department of Civil Engineering, State University of Maringá, Colombo Avenue, 5790, Maringá (PR), 87020-900, Brazil.
Eduardo Chahud
Department of Civil Engineering, Federal University of Minas Gerais, Antônio Carlos Avenue, 6627, Belo Horizonte (MG), 31270-901, Brazil.
Felipe Nascimento Arroyo
Department of Civil Engineering, Integrated Faculty of Cacoal, Dos Esportes Street, 1038, Cacoal (RO), 76965-864, Brazil.
André Luis Christoforo *
Department of Civil Engineering, Federal University of São Carlos, Washington Luís Highway, SP-310, km-235, São Carlos (SP), 13565-905, Brazil.
Diego Henrique de Almeida
Department of Civil Engineering, Federal University of São Carlos, Washington Luís Highway, SP-310, km-235, São Carlos (SP), 13565-905, Brazil.
Francisco Antonio Rocco Lahr
Department of Structures, University of São Paulo, Trabalhador São-Carlense Avenue, 400, São Carlos (SP), 13566-590, Brazil.
*Author to whom correspondence should be addressed.
Abstract
The pull out of steel bars bonded-in in structural wood pieces present highly satisfactory performance concerning esthetics, strength and connection stiffness, nevertheless, great concerns arise relating to the bonding quality control, making some authors suggest that the bonding operation must be done in a factory environment with the adequate quality control and by specialized people. Several studies have been published analyzing methods of production control or the effect of common contaminators, present in the bonding area which might affect the global capacity of the connection. In this work, anchorage strength was evaluated under the effects of four superficial treatments on the anchorage area of steel bars and increasing and decreasing moisture variations after bonding. The adhesive used was the epoxy resin Sikadur32 Fluid and the steel bars were perpendicularly fixed to the wood fibers, obtained through a random sample of a lot of sawed Corymbia citriodora wood. In 98.70% of rupture, specimen occurred due to loss of resin adhesion on the bar surface, due to chemical and mechanical loss adhesion.
Keywords: Bonded-in bar, structural resins; anchorage strength, superficial treatment