TY - JOUR T1 - DYNAMIC AND CYCLIC STATIC LOADING BEHAVIOR OF SILTY-SANDY CLAY AT SMALL AND MODERATE STRAINS A1 - Katarzyna Gabryś A1 - Wojciech Sas A1 - Emil Soból JO - Acta Sci. Pol. Architectura} VL - 15 IS - 4 SP - 15 Y1 - 2016 UR - https://www.architectura.actapol.net/volume15/issue4/_4_.pdf SN - 1644-0730 KW - resonant column, torsional shear, clay, laboratory tests, stiffness AB - The shear modulus (G) is one of the key parameters for seismic ground response analysis and it can be usually determined by means of dynamic tests (DT), such as resonant column test (RCT), or cyclic static test (CST), e.g. torsional shear (TST). The RC and TS tests are widely used laboratory methods to fi nd stiffness of soil at small to medium strain range (0.0001–0.5%). The purpose of this paper is to present the experimental results from RC and CS laboratory tests on silty-sandy clay from the western part of Warsaw, Poland. The study aims to compare the shear modulus values obtained from two different research techniques. The infl uence of, in particular, the applied effective pressure, associated shear strain and experimental method (i.e. loading frequency and output amplitude) on the shear modulus at small strains (Gmax) and secant shear modulus (G) are investigated and proved. Generally, the results reveal that the examined soils stiffness calculated from TS tests is lower than from RC tests. ER -