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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Analytical and Experimental Studies of Fiber-Reinforced Polymer-Strengthened Concrete Beams Under Impact Loading
Author(s): Taiping Tang and Hamid Saadatmanesh
Publication: Structural Journal
Appears on pages(s): 139-149
Keywords: beams; deflection; fiber; loading; reinforcement
Abstract:A series of 27 concrete beams were tested to investigate the behavior of beams strengthened with fiber-reinforced polymer (FRP) laminates under impact loading. Two out of the 27 beams were not retrofitted and were used as control specimens. The impact force was delivered with a steel cylinder drop weight. The test results revealed that bonding composite laminates to concrete beams could significantly improve the performance of this type of structure to resist impact loading. In addition, bonding laminates increased cracking and flexural strength, as well as residual stiffness of the beams. Furthermore, it reduced the number of cracks, crack widths, and the maximum deflection. The residual stiffness of the strengthened beam after first impact was two to three times that of an unretrofitted beam, and the maximum deflection decreased by 30 to 40%. The improvement depends on the type and weight of composite laminate. compared with the static test results, the ultimate deflection, number of cracks, and crack width were smaller, but the maximum reaction force was three to four times larger than those of the beam under static loading. The residual stiffness of the strengthened beam after first impact can be calculated using a regression equation. The impact force can be obtained with a semi-empirical equation, which is derived from Spring-Mass models and modified by the test results. From flexural wave theory, an equation has been developed for predicting the deflection of a beam caused by impact loading.
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