Behavior of FRP reinforced AAC structural elements

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2018
Tuncer, Ertürk
AAC beams are classically manufactured by using steel reinforcement. However, in order to obtain more economical design and to prevent corrosion, it is also possible to apply FRP reinforcement. For this purpose, first, an experimental study was conduct-ed to investigate the response of steel reinforced and fiber reinforced AAC beam specimens under four point bending test. All the tests were performed with the col-laboration of Middle East Technical University and AKG Gazbeton. Unidirectional single layer carbon and glass fiber composites were applied at the bottom and top faces of the specimens throughout either half or full section width. The main parame-ters under investigation were strength, stiffness, ductility and energy absorption ca-pacity. Secondly, a closed form based section analysis program was prepared to com-pute capacity analysis and load-displacement relation of AAC specimens having steel reinforcement or composite fiber laminates. In this way, experimental results were correlated with the developed analytical modeling. It was observed that acceptable accuracy was obtained when experimental and theoretical results were compared. In other words, validation of analytical modeling was revealed. At the final stage of this study, usable debonding strain equations depending on the ratio of beam width to fiber width and number of fiber layer were recommended. Design charts were pre-pared by using these strain equations. In these design charts, based on demanded uniform distributed loads, the most economical FRP schemes were proposed for AAC beams having different span lengths and cross section dimensions.