Novel Time Integrators Applied to Non-Linear Real Time and Pseudo-Dynamic Tests

Abstract eng:
Real-time testing with dynamic substructuring (RTDS) is a novel form of hybrid numerical-experimental testing technique used to simulate structures subjected to seismic loadings. By imposing compatibility and equilibrium conditions at the interface between the numerical substructure and the physical substructure, respectively, the substructures are made to interact in real time. In this paper, first we show the application to non-linear hybrid tests of L-stable Real Time compatible integrators derived from Rosenbrock methods. These algorithms are competitive in terms of stability and accuracy when applied to real time and stiff problems. In detail, the non-linear specimen considered is a spring pendulum coupled to a linear or a non-linear numerical oscillator implemented by means of the Bouc-Wen model. We also present a novel interfield parallel partitioned method applied to pseudo-dynamic (PsD) tests with dynamic substructuring (DS). In detail, the proposed coupling algorithm enables arbitrary Generalized-α schemes to be coupled with different time steps in each subdomain and represents an extension of an interfield parallel method originally proposed by Pegon and Magonette. Numerical experiments highlight the improved performance of the novel method in PsD simulations with respect to its progenitor.

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