Conference Papers

Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506

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    Development of Region-Specific New Generation Attenuation Relations for North India Using Artificial Neural Networks
    (Springer Science and Business Media Deutschland GmbH, 2021) Huang, H.; Ramkrishnan, R.; Kolathayar, S.; Garg, A.; Yadav, J.S.
    Present study focuses on developing region-specific New Generation Ground Motion Prediction Models using Artificial intelligence technique for North India purely based on a measured ground motion data from specific region. Simple single hidden layered feed forward multilayer perceptron networks with back-propagation learning algorithm are used. A total of 280 data points of recorded strong motion data from the Kangra and Uttar Pradesh (UP) arrays, made available by the Program for Excellence in Strong Motion Studies (PESMOS), were used to train these networks. The first model predicts Moment Magnitude for a given Hypocentral Distance and Peak Ground Acceleration. The second model predicts Peak Ground Acceleration (PGA) for a given Hypocentral Distance (HPD) and Moment Magnitude (MM). Performance analysis, Uncertainty analysis and analysis of interactive effects have been done to test the reliability of the generated models. Optimization analysis was also performed to predict possible inputs of the models for a given set of outputs. Models have performed reasonably well for the given amount of non-linearity in the data. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
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    Analysis of Cushion Effects in Unconnected Piled Raft Foundation
    (Springer Science and Business Media Deutschland GmbH, 2022) Amalu, P.A.; Jayalekshmi, B.R.
    The piled raft foundations are an economical solution as well as a settlement reducer in the construction of high-rise buildings. Unconnected piled raft foundation is an innovative technique where a cushion separates the pile and raft. The cushion takes the load transferred from the raft and safely distributes over the piles beneath. This article analyses the seismic behaviour of connected and unconnected piled raft foundation of a multistorey building using ANSYS software based on the finite element method. An 8 m × 8 m × 1 m raft and 0.4 m × 0.4 m square concrete piles with depth of 12 m resting on a very soft clay stratum were modelled. The soil block of 16 m × 16 m plan dimension with a depth of 16 m was provided with transmitting boundaries at all lateral edges with properties corresponding to shear wave velocity of clay (150 m/s) and was analysed for the response under the ground motion corresponding to El Centro 1940 earthquake. The building load acting on the raft was considered as a uniformly distributed load of 0.2 MPa. The vertical and lateral displacements at the top of the raft were analysed with cushions having different elastic modulus and thickness. An increase in the elastic modulus of cushion tends to reduce the settlement considerably whereas, a positive correlation was observed between the depth of cushion layer and corresponding settlement. It is evident from the results of the numerical analysis that the stiffness of cushion layer and thickness are two important aspects which determine the displacements of unconnected piled raft systems. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.