A comparative study on the implementation of carbon and glass fibers wrappings to improve the compressive strength and s
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ORIGINAL PAPER
A comparative study on the implementation of carbon and glass fibers wrappings to improve the compressive strength and seismic behavior of concrete Seiyed Ali Haj Seiyed Taghia1 · Hamid Reza Darvishvand1 · Somayeh Asadi2 · Mohammad Pourhasan1 Received: 27 April 2020 / Accepted: 14 July 2020 © Springer Nature Switzerland AG 2020
Abstract Fiber-reinforced polymer (FRP) wrapping is one of the current approaches for retrofitting projects. This study aims to compare the performance of carbon and glass fibers in increase of compressive strength and improvement of concrete seismic parameters. In this research, three classes of concrete compressive strength (20, 35, and 50 MPa) are considered. The samples are warped with 0, 1, 3, and 5 layers of both fibers and examined under stress–strain tests. The results show that by adding more FRP layers, an increase is seen in compressive strength and seismic parameters. However, their growth rates decline. Moreover, the effect of both types of fibers is greater on improvement of compressive strength and failure strain for higher strength concrete. In contrast, fibers are more influential on lower strength concrete regarding energy absorption and ductility. Carbon and glass fibers are more effective in enhancing of compressive strength and seismic parameters, respectively. Statistical analysis indicates that, by adding more FRP layers, a tangible improvement on compressive strength and seismic parameters of concrete can be observed. That is true, especially for lower strength concrete. Moreover, the results demonstrate that the effect of fibers on the mentioned quantities is generally more than the effect of concrete classes. Finally, the Lam & Teng model shows a good fit with the experimental stress–strain diagrams. Keywords Carbon and glass fibers · Compressive strength · Seismic parameters · Statistical approach · Lam & Teng model
Introduction Currently, the rehabilitation of damaged structures is considered as one of the important issues of earthquake engineering. Fiber-reinforced polymer (FRP) techniques can be used with the goal of maintaining or rebuilding the strength * Seiyed Ali Haj Seiyed Taghia [email protected] Hamid Reza Darvishvand [email protected] Somayeh Asadi [email protected] Mohammad Pourhasan [email protected] 1
Department of Civil Engineering, Qazvin Branch, Islamic Azad University, Qazvin, Iran
Department of Architectural Engineering, 104 Engineering Unit A, The Pennsylvania State University, Philadelphia, USA
2
of worn-out structural elements, retrofitting of undamaged structural elements to tolerate the excessive load due to changing of the structural operation or compensating for design and implementation mistakes.
History of FRP FRP methods were developed as an alternative to steel plates for the first time in Europe. Sticking steel plates to the tension zones of concrete elements with epoxy resins were demonstrated to be a feasible technique for developing their flexural strength. This technique has be
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