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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, a new simplified method for the preliminary design of cable suspension bridges is proposed, which relates the stiffness of the deck truss with the stiffness of the cable, in which stresses are calculated.
Abstract: The preliminary design of suspension bridges is a very important step in the design of a structure, since this stage is the one that will lead to an efficient and economic structure. The models that are used nowadays are complex and sometimes hard to apply, leading to a lack of comprehension from the designing team. This work proposes a new simplified method for the preliminary design of cable suspension bridges that relate the stiffness of the deck truss with the stiffness of the cable, in which stresses are calculated. This relation is intended to know how much of the live load is absorbed by each of these elements and finally obtaining the pre-design values of each substructure. First simple parametric tests are executed using the proposed method and finite element method with geometrical non-linear analysis, in order to study its accuracy. Finally, a real case study is analysed using a known Portuguese suspension bridge, in which the proposed method is applied and compared with numerical solutions.
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Cites background from "Foundation analysis and design"
...where Mc is the bending moment at the centre of the span, P is the point load that is applied at the centre of the structure, Lspan is the total length of the span and b is a system characteristic coefficient that correlates the stiffness of the foundation with the stiffness of the beam (Bowles 1995)....
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...…Mc is the bending moment at the centre of the span, P is the point load that is applied at the centre of the structure, Lspan is the total length of the span and b is a system characteristic coefficient that correlates the stiffness of the foundation with the stiffness of the beam (Bowles 1995)....
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01 Jan 2015
TL;DR: In this article, the effect of soil flexibility on the response of the frame structure to dynamic load was investigated and it was shown that the response is highly dependent on the soil type and the method of modeling soil structure interaction.
Abstract: A common design practice for dynamic loading assumes the frame fixed at their bases. In reality, the supporting soil medium allows movement to some extent due to its property to deform. This may decrease the overall stiffness of the structural system and may increase the natural period of the system. The effect of soil flexibility is suggested to be accounted through consideration of springs which have specified stiffness and soil half space. Results show that the dynamic response of frame structure to vibrations is due to applied dynamic load and is highly dependent on the soil type and the method of modeling soil structure interaction. The response of frame structure under dynamic load is higher in case of linear discrete independent spring as comparing with perfect bond cases. Except the response of frame in case of piles embedded in soft clay, half space are higher than frame with piles and linear elastic spring due to the interaction between the frequencies of applied load and frequencies of frame structure. Also, result showed that it is important to include the soil-structure interaction in the analysis of the system in order to correctly simulate the dynamic problem for controlling on the resonance phenomena.
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TL;DR: In this paper, the authors investigated the relation between excavation-induced ground movements and damage probability of buildings in excavation affected distance, where the main focus was on masonry buildings and excavations stabilized using soil nail wall method.
Abstract: Excavation-induced ground movements and the resulting damages to adjacent structures and facilities is a source of concern for excavation projects in urban areas. The concern will be even higher if the adjacent structure is old or has low strength parameters like masonry building. Frame distortion and crack generation are predictors of building damage resulted from excavation-induced ground movements, which pose challenges to projects involving excavations. This study is aimed to investigate the relation between excavation-induced ground movements and damage probability of buildings in excavation affected distance. The main focus of this paper is on masonry buildings and excavations stabilized using soil nail wall method. To achieve this purpose, 21 masonry buildings adjacent to 12 excavation projects were studied. Parametric studies were performed by developing 3D FE models of brick walls and excavations stabilized using soil nail wall. Finally, probability evaluations were conducted to analyze the outputs obtained from case studies. Based on the obtained results, simple charts were established to estimate the damage of masonry structures in excavation affected distance with two key parameters including “Displacement Ratio” and “Normalized Distance”. The results also highlight the effects of building distance from excavation wall on its damage probability.
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01 Jan 2022
TL;DR: In this paper, the authors investigated the influence of the length and stiffness of the piles on the performance of the raft foundation and found that the vertical settlement at the edges of a raft is minimum for model M1 which is having longest peripheral pile and minimum settlement in model M5 which has longer central pile compared to peripheral piles.
Abstract: Piled raft foundations are usually used to transmit the loads from superstructure to the soil beneath the structure having low or medium bearing capacity to hard or rock strata with a higher bearing capacity and stiffness. This paper investigates the influence of the length and stiffness of the piles on the performance of the raft foundation. For this, a ten storey moment-resisting frame resting on piled raft foundation with different pile length was simulated numerically. Three-dimensional numerical model of the soil medium, piles, raft and the structural elements were created in ANSYS software. Four bay 10 storey building frames having 3 m bay length and storey height of 3 m is with different pile configurations are considered for the study. The column size of 0.5 m × 0.5 m and beam size of 0.3 m × 0.45 m were taken for frames. The dimension of the raft foundation is 14mx14mx1m. This study mainly focuses on the vertical settlement of the raft at various locations along the length of the raft foundation when subjected to El Centro earthquake and time history corresponding to response spectrum given in IS 1893 code. Study was conducted on five types of pile configuration based on pile length. It was found that the settlement at the edges of the raft is minimum for model M1 which is having longest peripheral pile and minimum settlement at the centre is observed for model M5 which has longer central pile compared to peripheral piles.
1 citations