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    Structural behavior of RC one-way slabs strengthened with ferrocement and FRP composites
    (2024-07-01)
    Joyklad, Panuwat
    ;
    Krishna Gadagamma, Chaitanya
    ;
    Maneengamlert, Bodee
    ;
    Nawaz, Adnan
    ;
    Ejaz, Ali
    Existing research lacks focus on the structural behavior of reinforced concrete (RC) one-way slabs reinforced with ferrocement, and there's a notable absence of comparative studies between fiber-reinforced polymers (FRPs) and ferrocement strengthening methods for these slabs. Given the cost-effectiveness and widespread use of ferrocement in structural reinforcement, this study aimed to address these gaps through an experimental program. Three sizes of wire mesh, categorized as Type-I (small), Type-II (medium), and Type-III (large), were employed in this study. Chemical or mechanical anchors were used to attach ferrocement jackets. Moreover, 6, 12, or 18 anchors were used to assess the effect of anchor configuration. The goal was to enhance the structural performance of slabs and compare them with slabs reinforced using FRP jackets. The study focused on preventing debonding of the strengthening layers, employing either mechanical or chemical anchors. All slabs exhibited ductile failure with flexural cracks. The peak load and ultimate deflection were enhanced by up to 49.00% and 109.07%, respectively, by the application of ferrocement jackets, whereas the dissipated energy was increased by up to 174.00 %. Notably, the use of chemical anchors demonstrated a superior ability to delay debonding and enhance ductility compared to mechanical anchors. Slabs reinforced with glass FRP (GFRP) showed delayed debonding relative to carbon FRP (CFRP) reinforced slabs, indicating the superior performance of chemical anchors with GFRP layers. Moreover, the type and size of wire mesh significantly influenced performance, with small and medium-sized mesh configurations enhancing ductility, while large-sized mesh exhibited relatively earlier debonding. The orientation of the wire mesh also played a crucial role, with parallel orientation to the longitudinal axis of slabs yielding better performance.
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    Experimental and Analytical Studies on Low-Cost Glass-Fiber-Reinforced-Polymer-Composite-Strengthened Reinforced Concrete Beams: A Comparison with Carbon/Sisal Fiber-Reinforced Polymers
    (2023-10-01)
    Rodsin, Kittipoom
    ;
    Ejaz, Ali
    ;
    Hussain, Qudeer
    ;
    Parichatprecha, Rattapoohm
    This study presents an experimental framework with seventeen beams to investigate the impact of loading type, configuration, and through-bolt anchorage on LC-GFRP (Low-Cost Glass-Fiber-Reinforced Polymer) confinement performance. Beams underwent three-point and four-point bending, with LC-GFRP applied in various ways, including U-shaped, side-bonded, and fully wrapped, with and without anchors. The performance of LC-GFRP was compared to CFRP (Carbon-Fiber-Reinforced Polymer) and sisal wraps. LC-GFRP in side-bonded and U-shaped configurations without anchors under three-point bending showed no shear failure, while those under four-point bending without anchors experienced shear failure. With anchors, U-shaped configurations successfully prevented shear failure. The side-bonded, U-shaped, and U-shaped configurations along the full span with anchors demonstrated peak capacity enhancements of 72.11%, 43.66%, and 68.39% higher improvements than the corresponding configurations without anchors, respectively. Wrapping all sides of the beam with LC-GFRP or CFRP prevented shear failure without additional anchors, with complete wrapping being the most efficient method. When anchors were used, significant capacity enhancements were observed. Existing shear strength prediction models were evaluated, highlighting the need for more tailored expressions for LC-GFRP confinement, especially for non-U-shaped configurations.
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    Experimental and numerical seismic assessment of non-ductile reinforced concrete (RC) columns strengthened with glass fiber reinforced polymer (GFRP)
    (2022-10-01)
    Rodsin, Kittipoom
    ;
    Mehmood, Tahir
    ;
    Kolozvari, Kristijan
    ;
    Nawaz, Adnan
    ;
    Samiullah, Qazi
    This study presents an experimental and numerical seismic evaluation of non-ductile reinforced concrete (RC) columns strengthened with glass fiber reinforced polymer (GFRP). Three RC column specimens exhibiting three different modes of failure, flexure, flexure-shear, and shear, were strengthened with locally available, inexpensive GFRP sheets and subjected to reversed cyclic loading. The results showed that GFRP sheets not only enhanced the ductility capacity of non-ductile RC columns but also helped to shift the undesirable shear and flexure-shear mode of failure to a more favorable flexural mode. A numerical model based on the multiple-vertical-line-element-model was also proposed and implemented in OpenSees to simulate the experimentally tested specimens. This simple yet robust model was successful in predicting the force–deformation response, including strength degradation of the tested specimens.