Abstract
This research program is intended to verify the influence of using distributed external U-wrap CFRP anchorage to shift the failure mode from overall debonding to sectional flexural failure for concrete beams externally bonded with CFRP sheets. Premature cover delamination and FRP debonding are predominant failure modes in FRP flexural strengthening that may be delayed or prevented by using FRP anchorage. The present experimental study aims to comparatively prove that proper anchorage of flexural strengthening is anticipated to yield a classical flexural failure by FRP rupture or concrete crushing. Once the cohesion of concrete and/or the adhesion with the FRP is exhausted, the U-wraps are engaged to provide anchorage to the flexural FRP through shear friction. Accordingly, three identical T beams and three identical rectangular beams were designed and constructed to examine the capacity improvement by preventing premature debonding failure. The first specimen in each series was tested as a control beam. The second specimen in each series was strengthened using five layers of flexural CFRP in order to admit a debonding failure. The third specimen in each series was strengthened with the same five layers of flexural CFRP plus additional transverse CFRP U-wraps. This study proved that it is possible to quantify the higher flexural capacity of CFRP strengthened beams using external anchorage.
Highlights
Structural strengthening and repair have become a major topic of interest over the past three decades due to the infrastructural needs for rehabilitation
An experimental program is conducted to qualify the performance of a distributed Carbon Fiber Reinforced Polymer sheets (CFRP) anchorage system in controlling the deboning failure mode in T and rectangular beams leading to the attainment of the full flexural capacity
The results indicate the success of the technique in achieving its goals and the applicability of the Teng et al [10] model, implemented by the ACI 440.2R-08 [17], in conservatively predicting the debonding failure
Summary
Structural strengthening and repair have become a major topic of interest over the past three decades due to the infrastructural needs for rehabilitation. Provides a state-of-the-art technique for strengthening and rehabilitation. Traditional methods of strengthening involve the application of externally bonded steel plates. The latter suffers from several shortcomings including the deterioration of bond between the steel and concrete due to steel corrosion, the difficulty in handling large steel plates, and the limited delivery lengths. Composites can provide a strengthening technique where the conventional systems do not work as efficiently. FRP sheets can be used in place of steel plates. FRP sheets can be wrapped around a structural element to provide anchorage and ease of construction
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