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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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TL;DR: In this paper, the study of framed structures on elastic foundations subjected to ground motion is considered using a model which combines conventional frame elements with elements obtained using the Winkler hypothesis, and a series of different base excitations, including earthquake response spectra, are considered.
Abstract: The study of framed structures on elastic foundations subjected to ground motion is considered using a model which combines conventional frame elements with elements obtained using the Winkler hypothesis. A series of different base excitations, including earthquake response spectra, are considered. Results are compared with those obtained for similar structures not including the elastic foundations.
01 Jan 2021
TL;DR: In this article, the authors evaluated the seismic performance of building frames considering SSI effect on scale-down steel building frame model prepared corresponding to RC prototype building frames of various height which are designated with reference to H/B ratio (H and B being height and width of building, respectively).
Abstract: It is a fact that response of the soil influences the motion of the structure and the motion of the structure in turn influences the response of the soil which is known as soil–structure interaction (SSI). The present study aims to evaluate the seismic performance of building frames considering SSI effect on scale-down steel building frame model prepared corresponding to RC prototype building frames of various height which are designated with reference to H/B ratio (H and B being height and width of building, respectively) as low-rise building for H/B less than 3.5, mid-rise building for H/B in between 3.5 and 5.25, and high-rise building for H/B higher than 5.25. The building frames considered are square in plan with single bay in both directions resting on GW soil. The experimental setup for fixed and flexible base condition is developed in the laboratory. The scaled-down models are subjected to El Centro time history using uniaxial servo hydraulic shake table. The effect of SSI on various dynamic parameters, i.e. acceleration, velocity, and displacement are studied. The study reveals that SSI effect is not significant in the low-rise building frame. However, with the increasing H/B ratio, SSI effect goes on becoming significant and predominant with nonlinear response. The study further reveals that mid-rise building frames is severely affected than high-rise building frame. In high-rise building frame, lower 30% portion is not affected by SSI. The middle 30% portion is producing almost same results for both the base condition. However, upper 40% portion of the building is significantly affected by SSI. Therefore, it is inferred that, not all, but certain building frames get affected by SSI depending upon their configuration such as H/D ratio and plan geometry apart from ground input motion (El Centro) supported on soil (GW) soil. Hence, it is recommended to incorporate SSI in the analysis of mid-rise and high-rise building frames to identify its vulnerability against safety and stability.
01 Jan 2002
TL;DR: In this paper, the efecto of the no-linealidad del suelo de fundacion in the desarrollo of las fuerzas and desplazamientos that se producen in las fundaciones de grupos de pilotes, for estructuras de puentes and compararlos with modelos that consideran lineal the interaccion suelo-pilote (ISP).
Abstract: RESUMEN: El objetivo de este trabajo, es estudiar el efecto de la no-linealidad del suelo de fundacion en el desarrollo de las fuerzas y desplazamientos que se producen en las fundaciones de grupos de pilotes, para estructuras de puentes y compararlos con modelos que consideran lineal la interaccion suelo-pilote (ISP). Para este trabajo se escogio un puente existente, y se modelo considerando que estaba soportado en cinco perfiles de suelo diferentes, los cuales variaban desde rigidos a blandos. Tambien se incluyo la alternativa de usar grupos de pilotes verticales o grupos de pilotes inclinados. De esta forma, diez fundaciones diferentes fueron disenadas; cinco para grupos de pilotes verticales y cinco para grupos de pilotes inclinados. Para la metodologia que considera interaccion suelo-pilote (ISP) lineal, se establecieron basados en consideraciones no-lineales, limites de desplazamientos horizontales y cargas maximas laterales para el pilote, asi como para cada una de las fundaciones disenadas. Estos limites, determinan el maximo desplazamiento o carga lateral en el pilote (o fundacion) para la cual las metodologias que consideran ISP lineal, producen desplazamientos horizontales conservadores en el pilote (o fundacion). Dichos limites, van a depender entre otros factores, de la rigidez del suelo y de si los pilotes en las fundaciones se encuentran en posicion vertical o inclinados. Comparaciones entre las fuerzas desarrolladas en los pilotes que conforman la fundacion, para las cargas de diseno, se obtuvieron mediante consideraciones de ISP lineal y no-lineal. Se encontro que siempre que no se exc edio el limite de la metodologia (LM), los resultados usando ISP lineal fueron conservadores al estimar los desplazamientos y las fuerzas en los pilotes disenados.
Cites background from "Foundation analysis and design"
...La rigidez axial, así como la torsional del pilote se consideró a base de las recomendaciones descritas en Bowles (1996): REV. INT....
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...DE DESASTRES NATURALES, ACCIDENTES E INFRAESTRUCTURA CIVIL Ktors = rigidez torsional del pilote, η = 2 a 4; Bowles (1996) recomienda utilizar 2.5, G = E / [2(1+µ)]; módulo cortante del pilote, µ = 0.3 para acero; µ = 0.18 para concreto, J = constante torsional del pilote, Lp = largo del pilote....
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22 May 2014
TL;DR: In this paper, the authors evaluated three lateral load tests performed on 406 mm (16-inch) diameter auger cast piles (ACP) and found that the measured response of ACP to lateral load is somewhere in between the responses predicted using the linear and non-linear flexural stiffness.
Abstract: This paper evaluates three lateral load tests performed on 406 mm (16-inch) diameter auger cast piles (ACP). The lateral deflection values of the ACP measured in the field are compared with the lateral deflection values of the ACP predicted using a commercial computer program, LPile. The predictions were made assuming the linear, as well as the non-linear, variation of the flexural stiffness of ACP. A sensitivity analysis was performed to determine the effect of various soil parameters on the lateral deflection of the ACP. The sensitivity analysis indicated that soil layers at a depth of about 0.3 times the length of the pile (i.e., 0.30L, where L = length of the pile) or greater has a negligible effect on the lateral deflection of the ACP. Based on the results of the lateral load test data of ACP, it is determined that the measured response of ACP to lateral load is somewhere in between the responses predicted using the linear and non-linear flexural stiffness of ACP. Further, reliable prediction of lateral displacement is not possible without knowing the accurate values of modulus of elasticity of pile material.
01 Jan 2007
TL;DR: In this paper, a method to include scaled graphs into a spreadsheet, which completes the engineering calculations and helps in the final decision to accept or modify a design, is presented, which can be easily transferred into any computer assisted drafting (CAD) program.
Abstract: Engineering is a profession where graphical presentation is very important in understanding and verifying results. Geometric proportions, spacing, and other features can be clearly perceived if a scaled graph is displayed together with the calculations, and thus, the engineering student can make better decisions about the final design. Overall, these spreadsheets with graphical capabilities help the learning process. The use of Excel spreadsheets in engineering education and professional practice is frequent because this tool is versatile and powerful. However, a deficiency of spreadsheets is the lack of graphic representation. This may be solved by using the programming tools of Visual Basic for Applications (VBA) that is included in the package of Microsoft Office. This paper presents a method to include scaled graphs into a spreadsheet, which completes the engineering calculations and helps in the final decision to accept or modify a design. These graphs are also useful in the drafting process, because the graphs can be easily transferred into any computer assisted drafting (CAD) program. Several actual class examples are included.