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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
10 May 2013
TL;DR: In this article, the authors compare different modeling methods and then propose an efficient approach for their design in high seismic regions, where two different types of foundations should be considered for these areas: mats and piles.
Abstract: Generally, foundations for large dynamic equipment are made of considerable amounts of concrete. Thus, they contribute to a significant percentage of a project's total concrete quantity. Designing these dynamic foundations requires a series of static and dynamic analyses to meet the vibration requirement of the equipment and any seismic requirements of the local building codes. This article researches and compares different modeling methods, and then proposes an efficient approach for their design in high seismic regions. For design optimization, two different types of foundations should be considered for these areas: mats and piles. Liquefaction, downdrag on piles, bearing pressure, spring constants, soil stratification, water table, soil types, bearing depth, and settlement, can all affect a foundation. Reviewing the geotech report and performing a cost/risk analysis with the contractor should make it clear which type of foundation should be considered at a given locale. Engineers should design these foundations using a finite element modeling software that can handle dynamic loading. Modal analysis can be used to provide frequencies and displacement amplitudes to verify vibration performance criteria based on ACI 351 and the manufacture's requirements. Modal analysis can also be used to analyze seismic response spectrum per SAP time history analysis. In addition, a model based on static and quasi-static loads as required by the applicable building code should be analyzed. The ability to combine these models into one can help to solve these problems more quickly and efficiently. A case study for a foundation of steam turbine generator is presented, in which, the analysis features and design procedures used are described in detail. This may help design engineers understand the different advantages and results of finite element models, to pick the best modeling option for any given situation.

2 citations

Journal ArticleDOI
TL;DR: In this paper, the moment responses of rectangular pole foundations according to their shapes were investigated numerically, and the optimized shapes of pole foundation for more effective and economic installation adjacent to railroad track were proposed.
Abstract: Electric pole foundations for overhead catenary system of railroad should be designed so that they may resist significant overturning moment but relatively small vertical forces. Also they should have proper shapes to be installed at restricted narrow areas adjacent to railroad track. In this paper the moment responses of rectangular pole foundations according to their shapes were investigated numerically. A three-dimensional finite element method was developed and verified so that the numerical behaviors of the foundation resisting the overturning moments were compared reasonably well with those from an existing real-scale load test. The influences of aspect ratio, varying section with depth and loading directions for rectangular section were investigated using the developed numerical method. From the numerical results, the optimized shapes of pole foundation for more effective and economic installation adjacent to railroad track are proposed.

2 citations


Additional excerpts

  • ...따라서 Bowles(1988)가 제시한 전형적인 탄 성계수를 적용하여, 조밀한 사질토(dense sand)에 대한 상한치인 81MPa과 조밀한 자갈섞인 사질토(Dense sand and gravel)의 중간치인 150MPa를 각각 기초하부 최하 부층의 강성으로 하여 탄성계수를 깊이에 따라 단계적 으로 증가시킨 2 종류의 다층지반 해석도 수행하였다....

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Journal ArticleDOI
TL;DR: In this paper, the authors examined the pavement distress data obtained from the field as well as the effects of the soil cover depth, joint position and reinforced slab length on the behaviour of concrete pavement using the finite element method.
Abstract: This study examined the pavement distress data obtained from the field as well as the effects of the soil cover depth, joint position and reinforced slab length on the behaviour of concrete pavement using the finite element method. An ultimate strength model with a similarity of 1/2 was designed and constructed. Finite element analysis incorporating an implicit direct numerical integration scheme was conducted to obtain an optimal design for the pavement structure above a box culvert. An accelerated pavement test was conducted for validation, in which a realistic traffic load was imposed on the pavement model constructed in the laboratory. The strain histories were measured at each section and compared with those of numerical analysis. The optimal joint position and reinforced slab length that can minimise the damage to the pavement structure above a box culvert were also determined.

2 citations


Cites methods from "Foundation analysis and design"

  • ...The material properties of the subgrade and backfill ground were adopted from Bowles (1996) and Pimentel et al. (2009)....

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Journal ArticleDOI
TL;DR: In this paper, the effects of SSI on the seismic response of a building resting on a raft foundation were analyzed for a typical multi-story building. But, the conventional design procedure usually involves assumption of fixity at the base of foundation neglecting the flexibility of the foundation, the compressibility of soil mass and consequently the effect of foundation settlement on further redistribution of bending moment and shear force demands.
Abstract: Through the structures are supported on soil, most of the designers do not consider the soil structure interaction and its subsequent effect on structure during an earthquake. Recent studies show that the effects of Soil Structure Interaction (SSI) may be detrimental to the seismic response of structure and neglecting SSI in analysis may lead to un-conservative design. Despite this, the conventional design procedure usually involves assumption of fixity at the base of foundation neglecting the flexibility of the foundation, the compressibility of soil mass and consequently the effect of foundation settlement on further redistribution of bending moment and shear force demands. The effects of SSI are analyzed for typical multi-story building resting on raft foundation. Two methods of analysis are used for seismic demands evaluation of the special moment resistant frame buildings: equivalent static load (ESL) and response spectrum (RS) methods using ETABS ultimate 2016 software as per IS 1893:2002 “Criteria for Earthquake Resistant Design of Structures”. Numerical results obtained using soil structure interaction model conditions are compared to those corresponding to fixed-base support conditions. The peak responses of natural time period, roof displacement, story drift and base shear are analyzed.

2 citations