Abstract
This paper describes the immediate settlement of uniformly loaded rough ring footings with any stiffness on an inhomogeneous finite layer overlying a rough rigid base, which is not yet covered in the literature. Numerical solutions for a wide range of geometric and material combinations are obtained by finite element method. The effects of dimensionless parameters related to footing internal opening, compressibility, footing stiffness, finite layer thickness and soil inhomogeneity are examined. Based on the results, design charts are presented in the form of settlement influence factors that can be used to calculate the immediate settlements at the inner and outer points of ring footings.
Highlights
Ring footings are continuous footings that have been wrapped into a circle
The results are presented in the familiar form of the settlement influence factors at the points investigated: in the perfectly flexible footing case (K = 0.001), the influence charts for the inner and outer settlement of a footing are given; in the perfectly rigid footing case (K = 100), the influence charts for inner settlement are provided
The purpose of this study is to analyze the settlement of a rough ring footing of any stiffness in an isotropic elastic finite layer with the modulus of elasticity linearly varying with the depth, overlying a rough rigid base
Summary
Ring footings are continuous footings that have been wrapped into a circle. In engineering practice, they are commonly used to support columns or walls of axisymmetric structures such as silos, smokestacks, television antennas, communication towers, and bridge piers [1]. The behavioral characteristics of ring footings interacting with supporting medium are dependent on the soil and loading conditions, as well as the geometry of these opening. The settlement influence factors depend on parameters associated to the geometry and properties of ground and footing, including soil homogeneity, Poisson’s ratio, soil layering, layer thickness, footing shape, footing stiffness, and base roughness. For the simple case of a uniformly loaded smooth circular footing on the surface of a homogeneous isotropic elastic half-space, the immediate settlement is given by qD s= 1 − νs I (2). For a flexible circular footing, I is equal to 1 and 2/π for the center and edge points, respectively, and 0.85 for the average settlement [10].
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