Conference Papers

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

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Author: search.filters.author.Jayalekshmi, B.R.Subject: search.filters.subject.Finite element analysis

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    Seismic Behaviour of Soil Nailed Wall
    (Springer Science and Business Media Deutschland GmbH, 2021) Amrita; Jayalekshmi, B.R.; Shivashankar, R.
    Soil nailing is a technique used to stabilise steep cut slopes and to retain excavations. The method consists of inserting nail bars into the ground either by drilling or by grouting. The present study evaluates the seismic behaviour of a soil nailed wall supporting a vertical cut of height 6 m. The finite element analysis has been carried out to study the stability and performance of the soil nailed wall using ANSYS software. The seismic resistance of the wall is analysed under the El-Centro ground motion. The seismic response variation for different parameters such as angle of inclination of nails and soil strength properties are studied. The maximum lateral displacements and acceleration response of soil nailed wall are evaluated under static as well as dynamic conditions. The results of the study indicate that soil nailed system imparts stability to the retaining system under dynamic conditions. © 2021, Springer Nature Singapore Pte Ltd.
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    Dynamic Response of Soil Nailed Wall
    (Springer Science and Business Media Deutschland GmbH, 2021) Amrita; Jayalekshmi, B.R.; Shivashankar, R.
    Soil nailing is a technique used to stabilize steep cut slopes and to retain excavations. The method consists of inserting nail bars into the ground to stabilize the soil mass. The present study evaluates the dynamic response of a soil nailed wall supporting a vertical cut of height 6 m. The finite element analysis has been carried out to study the stability and performance of the soil nailed wall using PLAXIS 2D software. The seismic resistance and failure mechanism of the wall are analyzed under the El Centro ground motion. The seismic response variation for different parameters such as angle of inclination of nail and length of nail is studied. The results are observed in terms of maximum lateral displacement, development of maximum tensile force in nails and failure mechanism of soil nailed wall under static and dynamic conditions. The results of the study indicate that the soil nailed structure is an effective method which imparts stability to the retaining system under dynamic conditions. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
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    Seismic Response of Buildings Resting on Pile-Raft Foundation in Soft Soil
    (Springer Science and Business Media Deutschland GmbH, 2021) Krishna, S.V.; Jayalekshmi, B.R.
    The combined pile-raft foundation is used for high-rise buildings on soft soil since it is an efficient and economical foundation system. The present study deals with evaluation of performance of 15 storey reinforced concrete structures built on piled-raft foundation resting on soft soil under earthquake loads. Finite element analysis of the three dimensional soil-pile-raft-building systems consisting of a combination of long and short piles have been carried out for transient response. The length ratio between the central piles and corner piles is varied from 0.33 to 3 such that the combinations consist of long piles placed at corners or at centre region while short piles are placed at centre or at corners. These systems are subjected to ground motions corresponding to El-Centro and Loma prieta earthquake. The seismic responses of the integrated systems vary with the change in the length of pile. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
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    A Study on Settlement Variation in Piled Raft Foundation Under Seismic Loads
    (Springer Science and Business Media Deutschland GmbH, 2022) Krishna, S.V.; Jayalekshmi, B.R.
    Piled raft foundations are usually used to transmit the loads from superstructure to the soil beneath the structure having low or medium bearing capacity to hard or rock strata with a higher bearing capacity and stiffness. This paper investigates the influence of the length and stiffness of the piles on the performance of the raft foundation. For this, a ten storey moment-resisting frame resting on piled raft foundation with different pile length was simulated numerically. Three-dimensional numerical model of the soil medium, piles, raft and the structural elements were created in ANSYS software. Four bay 10 storey building frames having 3 m bay length and storey height of 3 m is with different pile configurations are considered for the study. The column size of 0.5 m × 0.5 m and beam size of 0.3 m × 0.45 m were taken for frames. The dimension of the raft foundation is 14mx14mx1m. This study mainly focuses on the vertical settlement of the raft at various locations along the length of the raft foundation when subjected to El Centro earthquake and time history corresponding to response spectrum given in IS 1893 code. Study was conducted on five types of pile configuration based on pile length. It was found that the settlement at the edges of the raft is minimum for model M1 which is having longest peripheral pile and minimum settlement at the centre is observed for model M5 which has longer central pile compared to peripheral piles. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.