Conference Papers

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    Experimental analysis of thermally induced motion of U-tubes
    (Springer Science and Business Media, LLC, 2008) Malik, P.
    The present article focuses attention on the effect of thermal load on dynamic response of the thin U-tubes. Experimental studies are carried out on thermally induced vibration of internally heated cantilevered U-tube. The dynamic response of the tube is studied in lateral and transverse direction for varying heating rates and frequencies. The analysis showed that the rate of vibration is governed by the heating rate and natural frequency of the tube. Lower the heating rates larger are the time to attain steady state amplitude and vice versa, there exist a threshold heating rate to produce thermal induced motion for tube. Displacement response of the U-tube in the lateral direction, during the initial period of the tube motion, occurred in the first mode and with progress of time the displacement response changed to second mode with amplitude of vibrations being lower than that observed in first mode. © Springer Science + Business Media B.V. 2008.
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    Numerical Simulations for Seismic Response of Laterally Loaded Pile Foundation
    (Springer Science and Business Media Deutschland GmbH, 2024) Barik, T.; Chaudhary, B.
    Pile foundations are frequently used to safely transfer enormous loads from superstructures to deeper soil layers in order to support structural weight. Due to earthquakes, piles are subjected to dynamic loadings, which causes significant damage to the foundation as well as the superstructure. Laterally loaded piles vulnerable to earthquakes have a complex dynamic reaction. Earthquake motions shake the foundation ground which can make it unstable. Due to this unpredictable behaviour, the research has been carried out for the last few decades on it but still the behaviour is not understood completely. Therefore, an attempt has been made in this study to investigate the dynamic response of the pile foundation due to earthquakes by performing numerical study using Finite Element (FE) program, PLAXIS 3D. In addition to it, several parameters have been studied to understand the effects of several parameters like soil properties, earthquake features (acceleration, frequency etc.) on pile behaviour, considering soil-pile interaction. It can be stated that this numerical simulation will be useful for the researchers and practicing engineers working on this domain. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.
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    Seismic Analysis of Piled-Raft Foundations in Mid-Rise Buildings on Soft Soil
    (Springer Science and Business Media Deutschland GmbH, 2024) Amalu, P.A.; Jayalekshmi, B.R.
    The utilization of piled-raft foundations is prevalent in buildings constructed on soft soil to mitigate settlement and increase bearing capacity. Nevertheless, if dynamic loading is not suitably considered during the design phase, these foundations may fail. This investigation utilizes three-dimensional finite element analyses in OpenSees to explore the seismic behaviour of mid-rise buildings with piled-raft foundations founded on soft soil. The principal focus of this study is on the influence of soil-foundation-structure interactions (SFSIs) under earthquake loadings. For this purpose, the El-Centro 1979 earthquake was used as the base acceleration underneath the soil layer to simulate the seismic conditions. The study scrutinizes the influence of pile flexural rigidity and superstructure configuration (G + 2, G + 4, G + 7) on the responses of mid-rise buildings on piled-raft foundations under earthquake loading. The findings revealed that buildings with a higher number of floors exhibit larger inter-storey drift with consideration of SFSI. Additionally, an increase in pile flexural rigidity significantly diminishes lateral displacements and shear force during earthquake loading. This study highlights that the flexural rigidity of pile and superstructure configuration are two pivotal factors that determine the response of piled-raft foundations of mid-rise buildings under earthquake loading. Proper consideration of these factors during the design phase can help mitigate the risk of failure and improve the performance of buildings with piled-raft foundations founded in soft soil. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.