Abstract
Machine foundations require significant attention from designers. The main goal of the design of machine foundation is to limit the amplitude displacement and not disturb the people who work near the machine. In some cases, if the design of machine foundations does not satisfy the acceptable value of the dynamic response (such as maximum amplitude of displacement), the stabilization of soil under the machine foundation may be used to decrease the amplitude of displacement. This paper outlines effect of stabilized soil under the foundation by cement on the displacement response of machine foundations. Three-dimensional analyses by using finite element method are carried out to investigate the effect of depth of stabilized layer with different percentage of cement content on the dynamic response of the machine foundation. In addition, the effect of area stabilized by cement material on the dynamic response of machine foundation is investigated. The results shown that, the dynamic response of machine foundations generally decreases with increasing the depth of soil layer stabilized with cement. A significant decrease in the displacement of machine foundations is occurred for the stabilized soil layer with a depth of two times of the width of foundation, and the optimum percentage of cement for stabilizing is 6%.
Highlights
In principle, machine foundations should be designed so that the dynamic forces of machine are transmitted to the soil through the foundation in a way that all kinds of harmful effects are eliminated
A three-dimensional finite element method which is implemented in OpenSees program (Open System for Earthquake Engineering Simulation) [18] is used to analyze the dynamic response of the turbine machine foundation under the effect of harmonic excitation of vertical load
Soil stabilization by cement for the soil under machine foundations can be considered as a successful future technique to decrease the displacement of the machine
Summary
Machine foundations should be designed so that the dynamic forces of machine are transmitted to the soil through the foundation in a way that all kinds of harmful effects are eliminated. The actual safety factor is not knowledge due to the result being treated as an increased static load. Because of this doubt, the value of dynamic factor was often too high; the exercise showed that the harmful deformations results can be occurred during operation in spite of using such excessive factors. Some experimental tests of small and rigid model structures of few inches in height, of various shapes and soil densities, have been run on shaking table to study the effect of geometry, soil and embedment on response [15]. The goal of this study is considering the effect of soil stabilized by cement on dynamic response of machine foundations by using three-dimensional finite element modelling
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