Browsing by Author "Yadav, D."

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    Numerical study on the behaviour of steel fiber reinforced concrete beams for different crack lengths
    (Elsevier Ltd, 2022) Yadav, D.; Prashanth, P.
    In the present analysis, the behavior of Steel Fibrous Concrete Beams (SFCBs) is numerically modelled using ABAQUS. The concrete grade considered in the study is M25. Five different volumetric percentages of fibers, that is, 0.4, 0.6, 0.8, 1.0, and 1.5%, are considered in SFCBs for different crack lengths 10 mm, 20 mm and 30 mm. Three-point bending beams of dimensions 500 mm × 100 mm × 100 mm are modelled, and the load application was by displacement control for the numerical study. From the current analysis, it is concluded that as the crack length increases, the energy absorption and load-carrying capacity of beam decreases, and the presence of fibers shows significant improvement in flexural performance and energy absorption of SFCBs. © 2022
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    Numerical study on the effect of steel fibers on fracture and size effect in concrete beams
    (Elsevier Ltd, 2023) Yadav, D.; Prashanth, M.H.; Kumar, N.
    The construction sector uses concrete extensively all around the world. Concrete contains a lot of microcracks even before it is loaded. When a tensile force is applied, these microcracks attempt to open up. While designing, the strength of concrete in its tensile zone is ignored. The strength and ductility of the concrete can be improved due to the addition of steel fibers. Steel fibers use a bridge mechanism to restrict the micro-cracks spread. This study uses ABAQUS to numerically analyze the behaviour of the Steel Fiber Reinforced Concrete (SFRC) beams. Two grades of concrete are studied, M20 and M60, for varying volumetric percentages of steel fibers. It was observed from the study that the ultimate load increases by around 52% and 41% for M25 and M60 grade concrete, respectively, by adding 1% of steel fiber. Fracture properties such as fracture toughness and fracture energy are calculated. The addition of steel fibers enhanced fracture toughness and energy significantly. Adding 1% fiber increases fracture toughness by around 56% and 34% and fracture energy by around 169% and 136% for M25 and M60 concrete, respectively. The size effect on SFRC beams is studied to determine the size-independent fracture parameters. © 2023
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    Truncated tip triangular microstrip patch antenna
    (2010) Chaturvedi, A.; Bhomia, Y.; Yadav, D.
    This paper presents a design of triangular microstrip antenna with truncated tip and experimentally studied on Ansoft Designer v-2.2.0 software. This design technology is achieved by cutting all three tips of the triangular microstrip antenna and placing a single coaxial feed. Triangular patch antenna is designed on a FR4 substrate of thickness 1.6 mm and relative permittivity of 4.4 and mounted above the ground plane at a height of 6 mm. Bandwidth as high as 11.07% are achieved with stable pattern characteristics, such as gain and cross polarization, within its bandwidth. Impedance bandwidth, antenna gain and return loss are observed for the proposed antenna. Details of the measured and simulated results are presented and discussed. �2010 IEEE.
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    Truncated tip triangular microstrip patch antenna
    (2010) Chaturvedi, A.; Bhomia, Y.; Yadav, D.
    This paper presents a design of triangular microstrip antenna with truncated tip and experimentally studied on Ansoft Designer v-2.2.0 software. This design technology is achieved by cutting all three tips of the triangular microstrip antenna and placing a single coaxial feed. Triangular patch antenna is designed on a FR4 substrate of thickness 1.6 mm and relative permittivity of 4.4 and mounted above the ground plane at a height of 6 mm. Bandwidth as high as 11.07% are achieved with stable pattern characteristics, such as gain and cross polarization, within its bandwidth. Impedance bandwidth, antenna gain and return loss are observed for the proposed antenna. Details of the measured and simulated results are presented and discussed. ©2010 IEEE.