Abstract
Site response analyses and solution of dynamic soil-structure interaction problems need determination of variation of shear modulus and damping ratio with shear strain. Since many studies in literature concern evaluation of behavior of sands and silty sands, a series of cyclic triaxial tests were performed to determine the variation of shear modulus and damping ratio of a nonplastic silt with shear strain. Stress controlled cyclic triaxial tests on silt specimens of initial relative densities ranging among 30%, 50% and 70% were performed. Tests were carried out on identical samples under different CSR levels, and the confining pressure was selected as 100 kPa. Variation of shear modulus and damping ratio of silts with cyclic stress ratio amplitude, relative density and number of cycles were investigated. It was understood that soil relative density and cyclic stress ratio amplitude has a significant influence on shear modulus and damping ratio of silts. It was also observed that, as the cyclic stress ratio amplitude is increased, greater shear modulus and lower damping ratio values were obtained.
Highlights
Site response analysis is necessary for assessment of the behavior of soils subjected to seismic action, which is advised by Eurocode 8 and the New Turkish Building Code for Earthquake Resilience, which went into effect by 1st of January, 2019
The results of cyclic triaxial tests performed on a nonplastic silt are reported
The study focuses on effect of various cyclic stress ratio (CSR) levels on behavior of specimens of different initial relative densities
Summary
Site response analysis is necessary for assessment of the behavior of soils subjected to seismic action, which is advised by Eurocode 8 and the New Turkish Building Code for Earthquake Resilience, which went into effect by 1st of January, 2019. Along with site response analysis, solution of soil-structure interaction problems necessitate two parameters as inputs, which are vital for evaluation of the seismic response-shear modulus and damping ratio. The Young modulus (E) is defined as the slope of a secant line that connects the extreme points on a hysteresis loop at a given shear strain, as shown in Figure 1 [1]. In equations from 1 to 3, shear modulus (G) calculation procedure is summarized. As the cyclic strain amplitude increases, the shear modulus decreases
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