Theses and Dissertations from UMD

Permanent URI for this communityhttp://hdl.handle.net/1903/2

New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a give thesis/dissertation in DRUM

More information is available at Theses and Dissertations at University of Maryland Libraries.

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Author: search.filters.author.Sutaih, Ghassan Hassan

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    Soil-Pile Interaction Under Vertical Dynamic Loading
    (2018) Sutaih, Ghassan Hassan; Aggour, Mohamed S; Civil Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Improper foundation designs for machine vibrations can result in machine failure, severe discomfort to workers around the machine or excessive settlement. The goal of foundation design for machine vibrations is to minimize vibration amplitude. In poor soil conditions, pile foundations are used to support the machine. Soil-pile stiffness and damping must be known at the level of the pile head. Since piles are used mostly in a group, it is also necessary to determine the interaction of the piles within the group. This study uses a 3D finite element method to study the response of pile foundations subjected to vertical dynamic loading. It uses Lysmer’s analog where the pile is replaced by a single degree of freedom dynamic system that provides frequency independent parameters. A parametric study is performed to obtain the value of the stiffness and the damping of a single pile for different soil properties and for both homogeneous and inhomogeneous soils. Floating and end-bearing piles were also studied. Pile group response is influenced by the soil-pile-soil interaction. The interaction is obtained by varying both the spacing and the soil properties around the pile. Interaction between the piles causes reduction in the stiffness and damping of the soil-pile system compared to an isolated pile. The study provided the interaction factors as a function of pile spacing and properties of the soil. Using the interaction factors, the response of a group of piles can be determined from the response of a single pile.
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    RESPONSE OF FOUNDATIONS SUBJECTED TO VERTICAL DYNAMIC LOADING
    (2015) Sutaih, Ghassan Hassan; Aggour, Mohammed S; Civil Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Design of machine foundations that are subject to dynamic loading require that their amplified displacement is within certain limit so that such displacement doesn’t impede the operation of the machine they are supporting. For the design of such foundations, several methods are available that are based on a mathematical solution of the differential equation that represents dynamic loads on an elastic half space. When the soil conditions are not uniform, the response cannot be predicted accurately by these methods and hence numerical methods should be used to analyze the problem. This research presents a numerical solution to a foundation subject to dynamic loading considering: 1) the effect of soil layering on the dynamic response. Specifically, a footing rests on a finite soil layer over an elastic half space and 2) the effect of the depth of embedment of a foundation in a homogenous elastic half space on its dynamic response