Item


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

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

The authors acknowledge the support provided by the Spanish Government (Ministerio de Ciencia e Innovacion), Project Ref. BIA2010-20234-C03-02. The first author thanks the Ministerio de Educacion y Ciencia for Grant BES-2008-005740. The authors also thank the support of Schok Bauteile GMBH for the supply of GFRP bars

© Construction and Building Materials, 2013, vol. 41, p. 99-108

Elsevier

Author: Miàs Oller, Cristina
Torres Llinàs, Lluís
Turon Travesa, Albert
Sharaky, Ibrahim Attia
Date: 2013
Abstract: 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
The authors acknowledge the support provided by the Spanish Government (Ministerio de Ciencia e Innovacion), Project Ref. BIA2010-20234-C03-02. The first author thanks the Ministerio de Educacion y Ciencia for Grant BES-2008-005740. The authors also thank the support of Schok Bauteile GMBH for the supply of GFRP bars
Format: application/pdf
ISSN: 0950-0618
Document access: http://hdl.handle.net/10256/11962
Language: eng
Publisher: Elsevier
Collection: MICINN/PN 2011-2013/BIA2010-20234-C03-02
Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.conbuildmat.2012.11.055
Articles publicats (D-EMCI)
Is part of: © Construction and Building Materials, 2013, vol. 41, p. 99-108
Rights: Tots els drets reservats
Subject: Assaigs de materials
Materials -- Testing
Formigó armat -- Proves
Reinforced concrete -- Testing
Resistència de materials
Strength of materials
Esforç i tensió
Strains and stresses
Title: Effect of material properties on long-term deflections of GFRP reinforced concrete beams
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

Subjects

Authors