Book•
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
Citations
More filters
01 Jan 1985
TL;DR: The guidelines have been composed by a group in which representatives of public offices, companies and research centres worked together as discussed by the authors, and they have been used in hydraulic engineering for a long time on a large scale, especially after the great disaster in 1953 when a large part of western Holland was flooded by the sea.
Abstract: Asphalt products have been used in the Netherlands in hydraulic engineering for a long time on a large scale, especially after the great disaster in 1953 when a large part of western Holland was flooded by the sea. After the disaster a great number of dikes had to be repaired very quickly and this was possible with the use of asphalt as a revetment material. Asphalt could be placed much faster then the materials most commonly used in those days. Further more asphalt is, when desired, more watertight than clay which is also scarce. Except for bitumen no foreign construction materials are necessary.The guidelines have been composed by a group in which representatives of public offices, companies and research centres worked together. It was attempted to make the content as complete as possible. Experience and knowledge were gathered, investigations carried out and design models made. It is inevitable however, that there are some shortcomings. Therefore it is intended to adapt the guidelines from time to time and to update them with new information. Comments and reactions of the reader are therefore very welcome. The guidelines were written for Dutch purposes. This means that mostly applications to dikes, breakwaters and bed protections are considered. Other types as for instance reservoir and dam applications are only mentioned without specific details. Also, reference is made to Dutch standards and directives only. Despite these aspects these guidelines will certainly contribute to a better design, execution, management and maintenance for hydraulic asphalt constructions, not only in the Netherlands but also in other countries, the reason for the translation into the English language.
5 citations
TL;DR: In this paper, a reliability-based method was used to design and analyse shallow foundations using first-order Taylor series approximation, which is an effective tool to assist the foundation designers and analyists to investigate how reliable their designs or analyses are in relation to the ultimate bearing capacity of the foundations.
Abstract: A reliability based method was used to design and analyse shallow foundations using first-order Taylor series approximation. The computer program Mathcad was used to facilitate all mathematical and computional efforts. This method is an effective tool to assist the foundation designers and analyists to investigate how reliable their designs or analyses are in relation to the ultimate bearing capacity of the foundations. The approach presented in this paper provides a reliable alternative for design and analysis of shallow foundations, rather than the conventional design methods, which employs the assumptions of a specified saftey factor. Several examples were presented for design and analysis of strip footings embedded in sandy soil, and rectangular and square footings analysis embedded in clayey soils. The program input and output of each example are also presented and discussed.
5 citations
Journal Article•
TL;DR: In this paper, the authors presented a mathematical model to obtain the most economical dimension of the contact surface in combined footings of rectangular shape subjected to an axial load and moment in two directions (bidirectional bending), when the load that must support a structural member is applied.
Abstract: This paper presents a mathematical model to obtain the most economical dimension of the contact surface in combined footings of rectangular shape subjected to an axial load and moment in two directions (bidirectional bending), when the load that must support said structural member is applied. The cases presented in this paper are: 1) Combined footings of boundary; 2) Combined footings intermediate. The classic model considers an axial load and a moment around the axis “X” (transverse axis) applied to each column, i.e., the force resulting from the applied loads are located on the axis “Y” (longitudinal axis), and once obtained the resultant force and its position is necessary to adjust the length thereof such that the centroid of loads coincides with the geometrical center. The main part of this research is that the proposed model considers the bending moments around the axis “Y” and the classic model neglected the moments around the axis Y”. Then, the proposed model is more suited to he general conditions and is more economical.
5 citations
Cites background from "Foundation analysis and design"
...Las cimentaciones superficiales, cuyos sistemas constructivos generalmente no presentan mayores dificultades pueden ser de varios tipos, según su función: zapata aislada, zapata combinada, zapata corrida o losa de cimentación [1, 2]....
[...]
...Las cimentaciones se clasifican en superficiales y profundas, las cuales presentan importantes diferencias en cuanto a su geometría, al comportamiento del suelo, a su funcionalidad estructural y a sus sistemas constructivos [1, 2]....
[...]
...Una cimentación superficial es un elemento estructural cuya sección transversal es de dimensiones grandes con respecto a la altura y cuya función es trasladar las cargas de una edificación a profundidades relativamente cortas, menores de 4m aproximadamente, con respecto al nivel de la superficie natural del terreno [1-4]....
[...]
...En el diseño de cimentaciones superficiales, en cuanto a la aplicación de cargas son: 1) Zapatas sujetas a carga axial concéntrica; 2) Zapatas sujetas a carga axial y momento en una dirección (flexión unidireccional); 3) Zapatas sujetas a carga axial y momento en dos direcciones (flexión bidireccional) [1-4]....
[...]
...A continuación, la ecuación de la flexión bidireccional se utiliza para obtener los esfuerzos que actúan sobre la superficie de contacto de la zapata, que deben cumplir con las condiciones siguientes: 1) El esfuerzo mínimo debe ser igual o mayor que cero, debido a que el suelo no es capaz de soportar esfuerzos de tensión, 2) El esfuerzo máximo debe ser igual o menor que la capacidad admisible que puede soportar el suelo [1, 2, 8, 9]....
[...]
TL;DR: In this article, a central opening strut system is used to support a diaphragm wall for foundation excavation, and a full-scale structural testing is performed to examine the ultimate strength of the joint.
Abstract: A central opening strut system is used to support a diaphragm wall for foundation excavation. This system contains at least one regular polygon module and a number of straight strut members. These strut members connect the diaphragm wall and the regular polygon module together, so that the earth pressure acting on the diaphragm wall in one direction can be transmitted to the diaphragm wall in the other directions by the arch action of this polygon module. In this research, the basic structural behavior of the central opening strut system is examined. A full-scale structural testing of the joint subassemblage is also performed to examine the ultimate strength of the joint. A construction site with five excavation stages and four layers of strut systems is chosen as the case study. The ABAQUS finite-element program is employed in the study of the behavior of this system during various construction stages. From these studies, it is found that the proposed central opening strut system is able to provide a large working space and greatly increases the efficiency of the construction work. Through proper design of the member and the joints, this system provides a better safety factor as compared with the traditional strut system.
5 citations
TL;DR: In this paper, a rigorous analytical method is presented for calculating the interaction factor between two identical piles subjected to vertical loads, where the problem is decomposed into an extended soil mass and two fictitious piles characterized respectively by Young's modulus of the soil and that of the difference between the pile and soil.
Abstract: A rigorous analytical method is presented for calculating the interaction factor between two identical piles subjected to vertical loads. Following the technique proposed by Muki and Sternberg, the problem is decomposed into an extended soil mass and two fictitious piles characterized respectively by Young’s modulus of the soil and that of the difference between the pile and soil. The unknown axial forces along fictitious piles are determined by solving a Fredholm integral equation of the second kind, which imposes the compatibility condition that the axial strains of the fictitious piles are equal to those corresponding to the centroidal axes of the extended soil. The real pile forces and displacements can subequally be calculated based on the determined fictitious pile forces, and finally, the desired pile interaction factors may be obtained. Results confirm the validity of the proposed approach and portray the influence of the governing parameters on the pile interaction.
5 citations