Experimental data about cyclic stress-strain behaviour under torsional loading of structurally complex formation cropping out in central Italy

This data article presents the results obtained by means of combined resonant column and torsional shear dynamic tests (RCTS), using a Wykeham Farrance device performed at the Geotechnical Laboratory of the University of Bari Aldo Moro on 10 undisturbed isotropically consolidated fine-grained speciments taken from 10 sites in Central Italy. Two types of data are provided in the present paper. The first one contains the analyzed data of samples size and index properties of soils. The second one contains dynamic properties such as resonant frequency and viscous damping ratio measured from RC tests and 199 records concerning the variation of G/G0 (shear modulus ratio) and D (damping ratio %) in function of angular strain ɣ (%) with the number of cycles measured from CTS tests. Stress-strain degradation response curves of each samples are provided and descriptive pictures of specimens are given.