Department of Civil Engineering

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Author: search.filters.author.Singh, Shamsher BahadurSubject: search.filters.subject.CFRP

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Now showing 1 - 5 of 5
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    Flexural Response of CFRP Prestressed Highway Bridge Box-Beams
    (Precast/Prestressed Concrete Institute, 2004-02) Singh, Shamsher Bahadur
    This paper presents an experimental and analytical investigation of the flexural response of box beams reinforced and prestressed using carbon fiber reinforced polymer (CFRP) tendons. Two one-third scale box beams were prestressed using seven bonded pretensioning tendons and six unbonded post-tensioning tendons. A third beam was prestressed with seven bonded pretensioning tendons and six non-prestressed unbonded posttensioning tendons. Beams were reinforced with carbon fiber composite cable stirrups and tested to failure. A computer program was developed to predict deflection, strain, and post-tensioning forces at various loads. A parametric analysis examined the effects of the level of pretensioning and post-tensioning forces on the overall flexural response. Results showed that the beam prestressed using both pretensioning and unbonded post-tensioning tendons had a 26 percent higher ultimate load capacity and 36 percent lower energy ratio than the beam with non-prestressed unbonded post-tensioning tendons. Levels of initial pretensioning and posttensioning forces significantly affect the flexural response and beam failure mode.
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    Strengthening of Masonry Beam with ECC as Bed Joint
    (School of Engineering (Taylor’s University ), 2015-08) Singh, Shamsher Bahadur
    Engineered cementitious composite (ECC) is a cement based composite with pseudo-strain-hardening behavior and excellent crack control. Substitution of cement mortar with ECC can increase the tensile and bond strength of the masonry. In this paper, masonry beams were made with ECC as a bed joint. Fifteen masonry beams of 150 x 230 mm cross-section and 1300 mm length were fabricated. These masonry beams were tested for four point bending. Out of 15 beams, three were tested as control beam and remaining were externally strengthened with FRP sheets in different pattern to examine the flexural response. This study investigates the effectiveness of using ECC mortar as bed joint in masonry beam with external carbon fiber reinforced polymer (CFRP) and glass FRP (GFRP) strengthening. The experimental results showed that applying FRP sheets increased the load carrying capacity and ductility.
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    Study of the Bond Behavior of Carbon Fiber Reinforced Polymer (CFRP) Bars
    (ICJ, 2015) Singh, Shamsher Bahadur
    In this study, experiments were conducted to find the bond characteristics of three different carbon fibre reinforced polymer (CFRP) bars, i.e., DCI C-bars (manufactured by Diversified Composites Inc.), MIC C-bars (manufactured by Marshall Industries Composites Inc.) and Leadline C-bars (manufactured by Mitsubishi Functional Products Inc.) embedded in concrete. In addition to the bond characteristics of three different CFRP-bars, bond characteristics of steel bars were also evaluated. The bond characteristics of steel bars provided the basis for comparison of bond characteristics of CFRP bars. Load-slip relationships were plotted for the CFRP bars and the steel bars. The average bond strengths of DCI bars, MIC bars, Leadline bars and Steel bars are predicted to be 7.92 MPa, 6.89 MPa, 6.27 MPa and 14.47 MPa, respectively.
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    Strengthening of Masonry Beam with ECC as Bed Joint
    (School of Engineering (Taylor’s University ), 2015) Singh, Shamsher Bahadur
    Engineered cementitious composite (ECC) is a cement based composite with pseudo-strain-hardening behavior and excellent crack control. Substitution of cement mortar with ECC can increase the tensile and bond strength of the masonry. In this paper, masonry beams were made with ECC as a bed joint. Fifteen masonry beams of 150 x 230 mm cross-section and 1300 mm length were fabricated. These masonry beams were tested for four point bending. Out of 15 beams, three were tested as control beam and remaining were externally strengthened with FRP sheets in different pattern to examine the flexural response. This study investigates the effectiveness of using ECC mortar as bed joint in masonry beam with external carbon fiber reinforced polymer (CFRP) and glass FRP (GFRP) strengthening. The experimental results showed that applying FRP sheets increased the load carrying capacity and ductility.
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    Influence of curing on the mechanical performance of FRP laminates
    (Elsiever, 2018-03) Singh, Shamsher Bahadur
    Carbon fiber reinforced polymer (CFRP) and glass fiber reinforced polymer (GFRP) laminates are used in different structural elements of buildings such as beams, columns, floor slabs, hand railings and for the strengthening of structures. Strength and stiffness of CFRP and GFRP laminates are highly dependent on curing temperature and time. Therefore, it is important to study the influence of temperature and duration of curing on the strength and stiffness of laminates. This study deals with the influence of curing duration and temperature of CFRP and GFRP laminates on the tensile, compressive and flexural characteristics. Laminates were cured at temperatures of 80 °C, 120 °C and 160 °C for different time periods such as 1, 2 and 3 h in a hot air oven and another laminate cured at room temperature for 15 days as a reference. It is observed that the mechanical properties of the CFRP and GFRP specimens have better performance when cured under oven heating than being fabricated at room temperature. Conclusions have been drawn that longitudinal tensile strength of CFRP and GFRP laminates is better at 80 °C temperature curing for three hours and the maximum Young's modulus of CFRP and GFRP laminates was achieved at 80 °C and 120 °C temperature for 3-h curing, respectively. Similarly, peak longitudinal compressive strength for CFRP specimens was obtained at 80 °C temperature cured for three hours and GFRP specimens cured at 80 °C temperature for 1-h. The flexural strength of CFRP and GFRP specimens was highest at 160 °C temperature cured for 1-h. However, the flexural stiffness of CFRP and GFRP specimens was dominant at a temperature of 120 °C cured for 1-h and 3-h, respectively.