Site Specific Relationship for Strain Dependent Shear Modulus and Damping Using In Situ V S and High Strain Cyclic Test Results

Zehtab, Kaveh Hassan
Yılmaz, Mustafa Tolga
This study suggests a practical method for estimating site-specific strain dependent shear modulus and damping. The method uses in-situ shear wave velocity measurements and commercial cyclic laboratory tests on higher strains (i.e., 0.5% to 1%) in which the effect of disturbance is less significant. Shear modulus calculated using in-situ shear wave velocity and at higher cyclic shear strain, is used for building a hyperbolic relationship for shear stress and strain. Modified Masing's rule and the experimental hysteretic damping at that higher strain are used to create strain dependent damping relationship. As a result, the effects of sample disturbance on lab test results are reduced, and the number of laboratory tests decreases significantly.