Faculty Publications
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Item Parametric Study on Frequency Characteristics of Cylindrical Liquid Tanks(Springer, 2022) Nimisha, P.; Jayalekshmi, B.R.; Venkataramana, K.The response of liquid-storage tanks under seismic loading is a key research area. The study of free vibration characteristics is a prerequisite for understanding the dynamic behaviour of liquid tanks under seismic loading. Hence, the present study focuses on the analysis of different parameters that may influence the frequency characteristics of cylindrical liquid tanks. For this, a database of 560 three-dimensional cylindrical liquid tank models was developed by carrying out modal analysis using ANSYS Mechanical APDL software. The database was analysed with the aid of artificial neural networks and nonlinear regression analysis. Average deviations of 30% and 32% were observed for the impulsive frequency values estimated based on IS1893 (Part2):2014 and Eurocode-8, respectively, compared to the finite element results. Hence, modification coefficients were suggested with aspect ratio as the demarcating parameter and obtained a Pearson correlation coefficient of rXY > 0.9, between the predicted values of frequency and actual values. The predicted formulae reduced the deviations observed between the frequency estimated based on the codal expressions and those obtained from finite element analysis to 13% and 15%, corresponding to IS1893 (Part2):2014 and Eurocode-8, respectively. © 2022, The Institution of Engineers (India).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 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.