Dataset on the tested and simulated response of thick cold-formed circular hollow sections under cyclic loading

"Dataset on the tested and simulated response of thick cold-formed circular hollow sections under cyclic loading"Adam Jan Sadowski, Wei Jun Wong, Sai Chung Simon Li, Christian Málaga-Chuquitaype and Dimitris PachakisUniaxial material tensile testing was performed following standardised procedures (e.g. ASTM A370-14) with an Instron 250kN 8802 dynamic machine, supplemented by extensometers, uniaxial strain gauges and geometry measurements by digital Vernier callipers. The raw data was processed to correct for the load eccentricity caused by the double-curvature of the dog-bone specimens.Cyclic three-point bending tests were performed in a custom-built rig with a displacement-controlled loading protocol introduced by an Instron hydraulic actuator, together with uniaxial strain gauges, string potentiometers and a two-pair (four-camera) digital image correction (DIC) system. The DIC data gathered continuous surface deformation fields in the vicinity of the midspan plastic hinge, subsequently processed with the DaVis v8.4 software and custom-written Matlab code to approximate the local curvature of the neutral axis at this location.Finite element simulations were performed using the ABAQUS commercial software to reproduce the cyclic three-point bending tests which assumed perfect cylindrical geometries but used a kinematic strain hardening model calibrated as far as was possible on the uniaxial ‘half-cycle’ material tensile test data. Test vs. simulation comparisons appear acceptable and may be used for model validation and benchmarking purposes. Matlab code was developed to facilitate this comparison.The original research was funded by a Research Award from the UK Institution of Structural Engineers (IStructE), with additional financial support from COWI UK Ltd.The Authors are grateful for the kind help provided by Mr Leslie Clark, Mr Stefan Algar and Mr Andy Pullen of the Structures Laboratory of Imperial College London.