Effect of embedment on vibration of a model foundation of coastal structures

A.K. Jain


For the design of massive shallow and deep foundations of transit sheds, storage tanks, silos and other structures in the coastal zone, the effect of embedment is not taken into consideration. In this paper a study is made on the foundations which are subjected to dynamic loads. The scope of this paper is limited to examine by model studies the displacement and resonant frequency characteristics of a foundation partially or fully embedded within the soil medium. A concrete block of size 15 cm diameter x 30 cm height was embedded in compacted sand at various depths. For three different values of constant exciting force on the footing, the resulting vibration characteristics were measured. It was observed that there is a considerable reduction in the maximum amplitude and resonant frequency. From a theoretical model in which the effective spring constant is increasing, the experimental results were analysed. A tentative criteria has been suggested for the analytical design of the footing based on this model


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