Faculty Publications
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Item Numerical investigation of a novel flow damping device for mitigating liquid sloshing under bi-directional excitation(Springer Science and Business Media B.V., 2024) Jogi, P.; Jayalekshmi, B.R.Sloshing in liquid storage tanks (LSTs) poses a significant challenge, especially during the seismic events and necessitating the implementation of effective mitigation strategies. This study proposes a novel technique by introducing a flow-damping device (FDD) made up of singly curved cylindrical plates connected to a cylindrical stem. The FDD is designed to be placed inside the LSTs to dissipate seismic energy, thereby reducing sloshing effects. Numerical analysis was conducted using the Arbitrary Lagrangian and Eulerian formulations in ABAQUS to assess the efficiency of various FDD configurations in reducing sloshing displacements in LSTs. The liquid storage tank with and without FDDs, were subjected to uni and bi-directional ground motion records of Imperial valley and Northridge earthquakes with a scaled peak ground acceleration. The study revealed that the FDD configuration consisting of eight plates evenly distributed around the stem with two plates oriented towards each other is the most effective FDD in reducing the seismic response parameters. When the FDD is connected to the tank base and placed centrally inside the tank at a distance of one-sixth of the tank’s length from both ends of the tank wall achieved a maximum reduction of 52.64% in sloshing displacements and 47.99% in impulsive hydrodynamic pressures. These results emphasize the substantial effectiveness of the proposed FDD design in reducing sloshing and hydrodynamic effects in LSTs during seismic events. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024.Item Numerical study on reinforced vertical cuts integrated with RC buildings under the effects of ground motion(Institute of Engineering Mechanics (IEM), 2025) Amrita; Jayalekshmi, B.R.; Shivashankar, R.Soil nailing is an effective method used for stabilizing excavations and natural ground slopes. In situations with space constraints due to rapid urbanization, the available space near the soil-nailed vertical cuts can be utilized to construct multi-storied buildings. However, the presence of a building in proximity to the retained soil mass may alter the seismic response of a nailed structure. The building can be either constructed at a distance, connected or attached to the soil-nailed structure depending on the space availability. This study evaluates the behavior of such an integrated soil-nailed, wall-building system under seismic excitations by employing finite element analysis. The seismic response of a nailed wall supporting a vertical cut of a height of 6m under different connectivity conditions with an adjacent multi-story RC building is analyzed. Parametric studies are conducted with various heights of a building and under different frequency content of seismic excitations. The performance of the integrated system is evaluated regarding displacement and the acceleration response of the soil-nailed wall, as well as tensile force mobilized in nails. The innovative concept of integration between the two structures yields better seismic stability of the nailed structure, as well as for optimum use of land in space-constrained grounds with vertical cuts. © Institute of Engineering Mechanics, China Earthquake Administration 2025.