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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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01 Jan 2022
TL;DR: In this article, a numerical analysis based on Plaxis-2D is conducted to observe the behavior of soil-cement bed and stone columns, and the analysis is conducted on both Ordinary Stone Columns (OSCs) and Stone columns underlying Soil-Cement Bed (SCB).
Abstract: Stone columns increase the bearing capacity and reduce the compressibility of soft clayey soil. However, the use of stone columns is limited because of subsequent settlement upon loading. The settlement is due to the bulging of the stone columns. Hence the major application includes strengthening of embankment foundation, oil tank foundation, etc., where a large settlement is permitted. In case the bulging of a stone column is restricted, its use may include building a foundation also. In the present study, a soil-cement bed is placed over the stone columns to reduce the bulging effect of the stone columns. Numerical analysis based on Plaxis-2D is conducted to observe the behavior of soil-cement bed and stone columns. The analysis is conducted on both Ordinary Stone Columns (OSCs) and stone columns underlying Soil-Cement Bed (SCB). From the result of this study, it is observed that the use of soil-cement bed reduces the bulging effect and increases the load-carrying capacity more than two times. The degree of improvement depends on the thickness of the SCB. As such an optimum thickness is obtained by trial and error. The settlement at the maximum bearing capacity is also found to be a bare minimum. The group effect of the stone columns is also studied. The bulging of the stone columns in a group is not similar to that in a standalone condition. It suggests that the existing theory on the determination of bearing capacity of composite soil must be modified for a group. A limited number of small-scale laboratory studies was also conducted to verify the analytical results.
12 Dec 2015
TL;DR: In this paper, a data-data ini dengan formulanyamenghasilkan nilai daya dukung ying berbeda-beda, maka diperlukan evaluasi untukmembandingkan nilAI daya Dukung ijin (Qall) ying dihasilkan.
Abstract: Perencanaan dan pelaksanaan suatu pondasi tiang pancang pada lahan gambut untuk bangunandengan beban yang lebih besar memerlukan data tanah seperti data CPT, SPT, PDA, Log bordan Pile driving formula atau data yang lainnya. Data-data ini dengan formulanyamenghasilkan nilai daya dukung yang berbeda-beda, maka diperlukan evaluasi untukmembandingkan nilai daya dukung ijin (Qall) yang dihasilkan. Membandingkan nilai dayadukung ijin tiang pancang (Qall), dari data daya dukung ujung tiang (Qp) dan daya dukunggesekan kulit tiang (Qs) pada lokasi pengujian Pasar Cik Puan Pekanbaru. Daya dukung ijinrata-rata dari uji CPT 36,27 ton, dari uji SPT 33, 29 ton, dari uji PDA 33,15 ton, dari uji logbor 46,3 ton dan dari uji pile driving formula dengan data kalendring 46,5 ton. Hal inimenunjukkan bahwa nilai daya dukung ijin rata-rata dari uji CPT, SPT, PDA, log bor dan piledriving formula variatif dan tidak dapat menjadi data cross-check. Nilai daya dukung ijin tiangpancang dapat di-cross check dari data CPT, SPT dan PDA atau dari data Kalendering danLog Bor karena perbedaan nilai daya dukung ijinnya tidak signifikan. Kata kunci: CPT, SPT, PDA, Log bor, Pile driving formula, Daya Dukung, Tiang Pancang.
Journal Article•
TL;DR: In this article, the influence of soil-structure interaction in the analysis and design of a 4Bay and 5-Bay 5-storey building with isolated footing is investigated, showing an increase in the vibration period in comparison with the fixed-base model.
Abstract: The influence of soil-structure interaction in the analysis and design of a 4Bay and 5Bay 5-storey building with isolated footing is investigated. Models simulating two different conditions: namely soil-structure interaction and fixed-base behavior, effect of infill on lateral load resistance are considered. The influence of the soil structure interaction in the dynamic behavior of the structure shows an increase in the vibration period in comparison with the fixed-base model, which does not consider the supporting soil. The influence of the soil-structure interaction in the seismic design of the structure is reflected in a decrease of the horizontal spectral acceleration values. The inclusion of the soil in the structural analysis provides results, base shear and displacement values, which are closer to the actual behavior of the structure than those provided by the analysis of a fixed-base structure. Keywords— Soil-structure interaction, dynamic behavior of soil, performance point, spectral accelerations, base shear
TL;DR: In this paper, the authors discussed failures of concrete walkways in selected locations in Nigeria and concluded that provision must be made against turbulent flow and cohesive materials must be provided in the construction of walkways to prevent failure of walkway.
Abstract: Concrete walkways are relatively low cost alternatives to bridges and culverts. They provide good and dependable ways across streams and rivers. This article discusses failures of concrete walkways in selected locations in Nigeria. The selected locations in Katsina state were visited before raining season started and during raining season. Concrete walkways across selected rivers (streams) were examined and their failures were assessed. Soil samples at the location of the walkway were collected and classified. The study revealed that earlier failures of culverts/bridges led to the construction of these concrete walkways in 1985 because the walkways were cheaper and required lower technology than construction of bridges. The soils at the site were mainly sandy–loamy soil with an average of 75.5% sand, 9.85% clay, and 14.65% silt. Failures of the concrete walkways were due to rapid and varied flow in the middle of the river channel, the presence of a hydraulic jump, the lack of resistance to turbulent flow, the presence of impulse forces, high Froude number (F
r), and the lack of cohesion between the soil and concrete materials. It was then concluded that provision must be made against turbulent flow and cohesive materials must be provided in the construction of walkways to prevent failure of walkways.
Cites background from "Foundation analysis and design"
...Selection of the type of foundation is influenced by the site conditions, the nature of the loadings, and the type of structure. Common foundations are as follows [ 8 , 9]:...
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Journal Article•