Conference Papers

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

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Author: search.filters.author.Shivashankar, R.Subject: search.filters.subject.Soil-structure interaction

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    Evaluation of the effect of soil-structure interaction on the raft of tall reinforced concrete chimneys under across wind load
    (Research Publishing Services editorial@rpsonline.com.sg, 2013) Jisha, S.V.; Jayalekshmi, B.R.; Shivashankar, R.
    A three dimensional soil-structure interaction (SSI) analysis of tall reinforced concrete chimneys with piled annular raft and un-piled annular raft subjected to across wind load is carried out in the present study. Effects of SSI were evaluated using four different soil types and three different ratios of external diameter to thickness of the annular raft. The across wind load was computed according to IS:4998 (Part 1)-1992. The integrated chimney-foundation-soil system was analysed by finite element software ANSYS based on direct method of SSI assuming linear elastic behaviour. FE analyses were carried out for two cases of SSI; (I) chimney with un-piled raft and (II) chimney with piled raft. The responses in raft were evaluated for both the cases and compared to that from conventional method of analysis. It is found that due to the addition of piles, there is considerable reduction in the responses in the raft when compared to that in the un-piled raft especially for loose sand and medium sand. © © 2013 APCWE-VIII. All rights reserved. Published by Research Publishing, Singapore.
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    Investigation on Stability of Vertical Cuts Retained by Soil Nailing Using Finite Element Method
    (Springer Science and Business Media Deutschland GmbH, 2024) Amrita; Jayalekshmi, B.R.; Shivashankar, R.
    One of the methods that can be effectively used for stabilisation of vertical cuts, excavations and natural slopes is soil nailing. It comprises of insertion of nails into the soil mass to be retained and providing stability to it against failure. This study deals with numerical analysis of vertical cuts under static loading that have been stabilised using soil nailing by incorporating soil-structure interaction. Performance and characteristics of soil nailed vertical cuts of three different heights are evaluated. Finite element analysis of 6 m, 10 m and 14 m high soil nailed walls retaining three different types of soil masses are performed to evaluate the response of the structure under different parameters to obtain the more stable structure against overall failure. Stability of these structures expressed with respect to global factor of safety are evaluated using ϕ-c reduction analysis. Horizontal displacement of wall and mobilised axial nail forces are also determined. The effect of orientation of nail with horizontal and length of nail inserted into the soil mass on the response of nailed structures are evaluated. Studies conclude that the nail inclination of 15° results in maximum safety factor, minimum deformation and least axial nail forces. Increasing nail length results in structures with higher safety factors but a minimum length of 0.7 times the height of the wall is recommended. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.