Oreste S. Bursi graduated in Mechanical Engineering at the University of Padua in 1984, and achieved his PhD. in Mechanical Engineering at the University of Bristol. He is full Professor of Structural Dynamics and Control at the University of Trento since 2001. He has always been interested in complex dynamical non-linear systems consisting of structural and mechanical components as well as control devices. Devices have been used both to control in real time or test dynamical systems subjected to natural hazards based on computer hardware and software. Thus, through the analysis and design of such complex systems that require both advanced modelling and simulation and experimental techniques, Oreste S. Bursi has built up his scientific background tailored to multidisciplinary problems. As a result, he became the leader researcher in Europe in the area of heterogeneous dynamic substructure coupling. Recently, he addressed his research interests towards system identification and structural health monitoring of complex systems, e.g. bridges, pipes, etc., and quantitative risk assessment of critical petrochemical facilities subjected to technological accidents triggered by natural disasters.
ABSTRACT - Frameworks for low-discrepancy simulation models and composite experimental dynamic substructuring methods based on parallel partitioned algorithms and localized Lagrange multipliers
This lecture presents a novel approach to model validation and to the calibration of complex structural systems, through the adoption of heterogeneous (numerical/physical) simulation based on dynamic substructuring (HDS). A parallel partitioned time integrator based on the finite element tearing and interconnecting method plays a central role in solving the coupled system response, enabling a rigorous and stable synchronization between sub-systems and a realistic interaction between physical and numerical substructure response. As a proof of concept, we select an old reinforced concrete viaduct subjected to seismic loading, tested at the European Laboratory for Structural Assessment in Ispra and a bridge case study analysed at the Eucentre-TREES Laboratory of Pavia, with three alternative isolation solutions based on three types of devices. Moreover, owing to faster and more accurate testing equipment, a number of different offline experimental substructuring methods, operating both in time and frequency domains have been cross-examined at ETH Zurich (Switzerland) and at the University of Trento, (UNITN) and combined with online HDS, the so-called C-EDS method, to expedite a hybrid experiment/numerical simulation. Finally, capitalizing from the results of a more complex case study composed of a coupled isolated tank-piping system tested at UNITN, we provide a feasible way to employ the C-EDS method endowed with localized Lagrange multipliers, when several nonlinear physical substructures and multi-point constraints are present in the emulated system.