Effect of material properties on long-term deflections of GFRP reinforced concrete beams

Full Text
Effect-of-material-properties.pdf embargoed access
Request a copy
When filling the form you are requesting a copy of the article, that is deposited in the institutional repository (DUGiDocs), at the autor or main autor of the article. It will be the same author who decides to give a copy of the document to the person who requests it, if it considers it appropriate. In any case, the UdG Library doesn’t take part in this process because it is not authorized to provide restricted articles.
The influence of compressive concrete strength and reinforcement ratio on long-term deflections in GFRP reinforced concrete beams is analysed in this paper. A total of 20 beams, cast with two different concrete strengths (30 and 50 MPa), and different reinforcement amounts of GFRP and steel, were tested under short-term loading and then subjected to different levels of sustained loading for a period of between 250 and 700 days. The results obtained revealed the influence of the concrete and reinforcement properties on long-term deflections. Thus, the higher the reinforcement ratio and the lower the compressive strength were, the higher the total-to-instantaneous deflection ratio was. The measured long-term deflections were compared to those calculated using available design equations for FRP RC structures, such as those from ACI 440.1R-06 and CSA-S806-02, as well as being compared to the CEB-FIP procedure. In addition, the experimental data were evaluated with a methodology proposed by the authors, based on multiplicative coefficients, obtained from a rational simplification of the Effective Modulus Method. Long-term deflections obtained with CEB-FIP and the proposed methodology were in good agreement with the experimental values. However, some differences were found when ACI 440.1R-06 or CSA-S806-02 procedures were applied ​
​Tots els drets reservats