Comparison of online model updating methods in pseudo-dynamic hybrid simulations of TADAS frames

Abstract

Hybrid simulation is a cost-effective testing method to simulate responses of a structure under earthquake loads. In a conventional hybrid simulation, the structure is divided into experimental and numerical substructures. Experimental substructures represent the critical components that cannot be reliably simulated by numerical models. In the lack of enough number of testing equipment or budget deficit, only limited number of critical components can be modeled experimentally; others should be represented with numerical model. In the cases that critical components have common properties, the parameters in the numerically modeled components can be updated on the basis of measured response of the experimental specimen. The main objective of this research is to evaluate accuracy and computational time of two main methods for online model updating with component hysteretic behavior estimation scheme. In the first method, hysteretic parameters of numerical models get updated during the simulation. In the second method, weighted average of several hysteretic models 5 with pre-defined parameters shape the behavior of updating numerical models and weighting factor of each hysteretic model gets calibrated as simulation time proceeds. The employed structural model in this study is a 3-bay, 4-story moment resisting frame equipped with Triangular Added Damping and Stiffness dampers in all stories. It was observed that employing the second updating method results in more accurate responses.