Abstract
The effect of Carbon Fiber Reinforced Polymer (CFRP) retrofitting and concrete type on the flexural strength of prestressed concrete I-section girders used in bridges and beams in buildings is investigated. Non-linear moment-curvature relationships are predicted using an iterative algorithm for both non-retrofitted and CFRP-retrofitted prestressed concrete girder and beam cross-sections with various concrete types. Two different CFRP-retrofitting schemes are analyzed for comparing their effectiveness. It is found that although non-retrofitted beam section exhibits greater ductility, the use of CFRP retrofitting in both tension and compression regions simultaneously results in a significant increase in flexural strength. It is also found that the higher the ultimate concrete strength, the higher is the influence of CFRP-retrofitting on increasing flexural strength.
Highlights
The use of Carbon fiber reinforced polymer (CFRP) as a retrofitting material in civil engineering projects and studies is gaining impetus
The aim of this study is to generate theoretical moment-curvature relations for each of the three beam cross sections shown in Fig. 1 and Fig. 2 in order to determine the combined effectiveness of the retrofitting strategies with CFRP sheets and the type of concrete used for increasing the ultimate strength of the girder and beam sections
The following conclusions are drawn from the study of both non-retrofitted and CFRP retrofitted prestressed concrete beam cross sections: 1. Retrofitting the prestressed concrete beam cross section simultaneously in both tension and compression regions results in the largest gain in flexural strength
Summary
The use of Carbon fiber reinforced polymer (CFRP) as a retrofitting material in civil engineering projects and studies is gaining impetus. Other past studies have shown that the effect of fiber reinforced polymer materials in tension regions of both prestressed and non-prestressed reinforced concrete beams is to increase structural strength [4]-[7]. The combined effectiveness of concrete type and CFRP laminar sheets is investigated in increasing the strength of prestressed concrete beams. Two retrofitting strategies are studied as functions of concrete type, namely, the use of CFRP sheets at the bottom surface of the lower flange only, and CFRP sheets installed at the bottom or top surfaces of both flanges
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