Predictor-Corrector algorithm for multi-site hybrid simulation

In this paper, Predictor-Corrector algorithm for multi-site hybrid simulation has been proposed with AT-modification. The Predictor-Corrector algorithm does not require determination of the initial stiffness values of experimental components and is thus suitable for representing elastic and inelastic systems. Its numerical characteristics are thoroughly investigated comparing with a-Operator Splitting method. Experimental error is inevitably introduced in actual tests. To improve performance of the P-C algorithm under displacement control error in actual testing, the proposed AT-modification uses an algorithmic tangent stiffness calculated using actual feedback values from actuators in the lab. The new correction method shows better performance than I-modification under experimental errors. Error-propagation characteristics of the P-C method are presented under systematic displacement control error. In addition, a multi-site hybrid simulation using P-C method is conducted to show efficacy of the P-C method in a complex structural system.