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The dynamic properties of Leighton Buzzard sand have been investigated using a resonant column test apparatus. These data are compared with very low frequency cyclic tests on identical specimens. The comparison indicates that the properties of dry sand are independent of frequency, while those of fluid saturated sand are sensitive to the viscosity of the fluid and therefore to the frequency of oscillations. A one-dimensional model of kinematic hardening plasticity is used to predict the dynamic behaviour of the sand. The input parameters for this model are based on the results of static tests. These may be conducted on standard laboratory equipment with only minor modifications. The predictions are in good agreement with the measured data. In particular, the frequency response close to resonance is correctly shown to be asymmetric and the reduction in the resonant frequency with increasing strain amplitude is also correctly represented. The model has been used to generate a series of design curves that allow the dynamic behaviour of foundations to be predicted. Two design examples are given; an offshore gravity structure and a radar installation. The input parameters are based on a hyperbolic shear stress-shear strain equation for the soil. The practical consequences of these findings are assessed with regard to soil testing procedures and dynamic analyses of foundations.

A transparent soil model of granular fused quartz is developed to study the mechanics of shallow foundations. Soil models, unreinforced and reinforced, prepared at relative densities 0.34 (loose) and 0.64 to 0.69 (medium dense) are tested using a rectangular footing (25 mm wide x 40 mm long) under strain-controlled loading. Digital Image Correlation is used to identify displacements of a seeded central plane parallel to footing width (B) and construct vector fields and contour plots. Fiber-reinforced soil model data analysis is inconclusive. For the unreinforced medium-dense soil, minimum and peak magnitude horizontal displacements occurred directly under the footing at the footing edges; whereas in the loose soil, peak magnitude horizontal displacement occurred directly under the footing. Vector and contour plots revealed that a medium dense soil gradually distributes smaller magnitude displacements over a broad area, in contradistinction to acute, highly localized displacements of larger magnitude in a loose soil. / Includes bibliography. / Thesis (M.S.)--Florida Atlantic University, 2017. / FAU Electronic Theses and Dissertations Collection

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published_or_final_version / Civil and Structural Engineering / Master / Master of Philosophy

published_or_final_version / Civil and Structural Engineering / Master / Master of Philosophy

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No description available.

No description available.