Faculty Publications
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Item Dynamic stability evaluation of nail stabilised vertical cuts in various site classes(Techno-Press, 2024) Amrita; Jayalekshmi, B.R.; Shivashankar, R.The soil nailing method entails the utilisation of nails to reinforce and stabilise a zone of soil mass. This is widely used for various applications due to its effective performance under various loading conditions. The seismic response of 6m high vertical soil-nailed cut in various site classes under dynamic excitations has been investigated in this study considering various lengths and inclinations of nails. The influence of frequency content of dynamic excitation on the response of structure has been assessed through finite element analysis using time history data of three different earthquakes. The seismic stability of the nailed cut in retaining soil in various sites under El Centro, Kobe and Trinidad earthquake ground motion is evaluated based on maximum acceleration response, maximum horizontal deformation, earth pressure distribution on the wall and maximum axial force mobilised in nails. The optimum nail inclination is identified as 15° and a minimum nail length ratio of 0.7 is essential for a stable vertical cut under dynamic excitations. © 2024 Techno-Press, Ltd.Item Integrating soil-nailed walls with RC building for seismic stability in space-constrained sites(Springer Science and Business Media Deutschland GmbH, 2024) Amrita; Jayalekshmi, B.R.; Shivashankar, R.In urban environments, space constraints necessitate innovative construction methods. Due to rising demand for infrastructures and scarcity of plane ground, structures are built on sloping or irregular ground. To make use of available land, vertical cuts or excavations are made in the natural soil stratum which can be effectively retained using the soil nailing technique. However, if the area adjacent to the nailed vertical cut is utilised for constructing a multi-storeyed building, the behaviour of the nailed structure may vary. This study examines the impact of the presence of multi-storeyed RC buildings on the response of soil-nailed structures in their proximity during earthquake ground motion. The seismic response of a soil-nailed structure is evaluated in the presence of various heights of medium-rise multi-storeyed buildings. Three-dimensional multi-storeyed buildings and soil-nailed structures are analysed with various arrangements and connectivities between them, taking into account different soil profiles at the site. Dynamic finite element analyses of integrated soil-nailed wall-building systems have been performed using time history data of ground motion. The findings suggest that the integration between the two structures enhances the seismic stability of both the structures under dynamic load as evident in the reduced deformation and acceleration of the structures. It restricts the lateral movement of the nailed wall and reduces its displacement by about 40%. This integration can be implemented in space-constrained sites for optimum utilisation of available space. © The Author(s) 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.