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Foundation analysis and design

01 Jan 1968-
TL;DR: In this paper, Fondation de soutenagement et al. presented a reference record for Dimensionnement Reference Record created on 2004-09-07, modified on 2016-08-08.
Abstract: Keywords: Fondation ; Mur de soutenement ; Pieux ; Capacite portante ; Ancrage ; Dimensionnement Reference Record created on 2004-09-07, modified on 2016-08-08
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Proceedings ArticleDOI
01 Jan 2023
TL;DR: In this paper , compaction, consolidation, unconfined and confined characteristics of tire-fibre blended silty-clay at different investigating parameters were presented, where compaction tests were performed to evaluate the Maximum Dry Density (MDD) and Optimum Moisture Content (OMC) of soil-tire fibre mixture at different percentage of tire fibre (0, 10, 20, 30% and 40% by weight).
Abstract: This article presents the compaction, consolidation, unconfined and confined characteristics of tire-fibre blended silty-clay at different investigating parameters. The compaction tests were performed to evaluate the Maximum Dry Density (MDD) and Optimum Moisture Content (OMC) of soil-tire fibre mixture at different percentage of tire fibre (0%, 10%, 20%, 30% and 40% by weight). It was found that with increasing the amount of tire-fibre MDD of mixture decreased significantly whereas, OMC increases marginally. Both, unconfined compression strength (UCS) and confined triaxial tests were performed on the soil-tire mixes specimen prepared at MDD and OMC. The result shows that with increasing percentage of tire fibre to the silty-clay soil, the ductility of the soil-tire mixture increases whereas; the maximum shear stress at the failure is reduced. Based on UCS tests, the Energy Absorption Capacity (EAC) of soil-tire mixture is increased increased by 55% at 10% of tire fibre, for strain rate of 1.25mm/min, whereas; on further increase in TF from 10% to 30%, EAC decreased by 44%, 32%, 52% at the shearing rate of 0.62mm/min, 1.25mm/min and 2.5mm/min, respectively. However, based on the confined triaxial test results, the angle of internal friction of soil-tire mixture decreases with increasing tire contents; whereas, cohesion decreased up to 10% of tire fibre and beyond that it increases. EAC was found to be increased up to 20% of the tire fibre and further addition shows reduction in energy absorption capacity.
TL;DR: In this paper , three simplified methods have been applied to two cases of pile-raft systems, and the results of all the simplified methods are comparable with PLAXIS 3D for the two cases studied.
Abstract: In a combined piled raft foundation (CPRF) both raft and piles take their share of the total load applied. However, in practice, the contribution of a raft in taking load is usually ignored and the load is assumed to be supported on piles.(is way of CPRF becomes excessively conservative and uneconomical. To economize the design, relative load sharing of raft and piles in CPRF has to be found. In this connection, different simplified methods have been developed, each one with some limitations. In this study, three simplified methods have been applied to two cases of pile-raft systems. (e methods include Randolph, Poulos-Davis-Randolph, and modified Poulos-Davis-Randolph. (e first case is a hypothetical case consisting of a 12m× 12m raft supported on a square group of nine piles.(e second case study is an actual eight-story building to be constructed in Peshawar, Pakistan.(e building is supported on a pile-raft system, with raft resting on very soft clay underlain by dense sand. (e two case studies are also modelled in the finite element program PLAXIS 3D for comparison. (e results of all the simplified methods are comparable with PLAXIS 3D. However, the Randolph method is much closer to PLAXIS 3D for the two cases studied. Furthermore, it is also shown that piles in a piled raft system can be used as “stress reducers” as well as a “settlement reducers.” Additionally, the effect of interaction factors is also evaluated with the s/d ratio as well as with varying soil stiffness. It was concluded that ignoring these factors leads to a very unsafe design of the pile-raft system.
Journal ArticleDOI
TL;DR: In this article , the authors disebabkan daya dukung fondasi lah yang membuat fondasi mampu untuk menahan beban yang tersalurkan dari struktur atas bangunan.
Abstract: Daya dukung fondasi merupakan suatu hal yang sangat penting dalam beridirinya suatu bangunan. Hal ini disebabkan daya dukung fondasi lah yang membuat fondasi mampu untuk menahan beban yang tersalurkan dari struktur atas bangunan. Dalam menghitung daya dukung fondasi tentu saja harus mencari mendesain fondasi yang memiliki daya dukung aman sehingga bangunan tersebut pun akan berdiri dengan aman. Dalam memperhitungkan daya dukung dari fondasi perlu diketahui efektivitas tiang fondasi. Pada skripsi ini terjadi suatu kasus dalam penambahan lantai bangunan sehingga membutuhkan tambahan daya dukung dan tiang yang digunakan untuk menambah daya dukung inipun berbeda dari tiang utamanya. Tiang yang akan digunakan untuk menjadi tiang sisipan adalah micropile dan strauss pile. Kedua tiang sisipan tersebut akan dibandingkan jika disisipkan dengan jarak 1,5D dari tiang utama. Dalam menentukan daya dukung tambahan ini maka diperlukan perhitungan efisiensi kembali untuk mengetahui tiang yang paling baik dijadikan tiang sisipan. Hasil dari analisis diketahui bahwa dengan penggunaan satu tiang sisipan micropile sudah mampu untuk mencapai daya dukung yang diinginkan dan untuk strauss pile dibutuhkan 7 tiang sisipan tambahan untuk mencapai daya dukung yang diinginkan. Dari hasil analisa juga diperoleh bahwa reduksi daya dukung tiang strauss pile lebih besar dikarenakan jarak tiang yang saling berdekatan satu sama lain. Sehingga jika dibandingkan micropile lebih efektif digunakan menjadi tiang sisipan.