Shear Modulus And Damping Ratio Values Of Soils Found In Adama
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Date
2011-11
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Addis Ababa University
Abstract
In this study an attempt was done to determine shear modulus and damping ratio of soils found in Adama city. The city is located in Main Ethiopian Rift where occurrence of earthquake is expected. The response of soils for incoming earthquake is measured with the dynamic properties of soils (shear modulus and damping ratio) which are important parameters to study ground motion, site response of soil deposits under cyclic loading and soil -structure interaction. These parameters are also important for design of machine foundation. Therefore it is essential to study dynamic properties of soils under cyclic loading condition using cyclic simple shear machine.
The values of normalized shear modulus and damping ratio are compared with already known curves in literature. The study showed that the values of normalized shear modulus, G/Gmax plotted against shear strain, show scatter when compared with curves of Seed and idriss. For sand the scattered of results are observed. For saturated clay, all the measured points are close to the known curves. The values of damping ratio are also compared with curves given by Seed and Idriss. For strain less than 1% most of the measured points are located within range of the curves given for sand and clay soils. For strain greater than and equal to 1%, the points lay within the range for clays and outside the range for sand.
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InAdma