Browsing by Author "Yeabsira Bekele"

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    Dynamic Soil Characteristics of Selected Sites in Bole Sub-City of Addis Ababa
    (Addis Ababa University, 2025-05) Yeabsira Bekele; Tensay Gebremedhin (PhD)
    Addis Ababa which is situated on the margins of ethiopian rift valley system is positioned in seismic zone 3 according to ES EN 2015. The city has a moderate seismicity. This study investigates the dynamic properties of soils taken from selected test pits in bole Subcity of Addis Ababa city at 2.5m sampling depth. To assess the area's capacity to resist dynamic loads from potential earthquakes, both index and dynamic properties of the soils were evaluated. Index property tests including atterberg limits, particle size analysis, free swell, and specific gravity revealed a wide range of test results. Based on USCS soil classification system the soils samples were identified primarily as plastic clay and clayey sand . Dynamic behavior was further examined using cyclic simple shear tests at varying strain amplitudes (0.01% to 5%) and axial stresses (100 kPa to 400 kPa). The stress strain responses were recorded, and the shear modulus and damping ratio were obtained for each soil sample. The findings were compared with local and international studies, contributing valuable data for seismic hazard assessment and earthquake-resilient design in the region.