| 英文摘要 |
Hybrid simulation allows numerical and physical substructures to be integrated such that the interaction between the substructures can be taken into account in seismic performance assessment. As a result, hybrid simulation can offer a cost-effective alternative to the shaking table test. However, conventional hybrid simulation is always restricted due to the limited number of facilities and specimens. Some or many structural elements, that are similar to or the same as the physical substructures, must be modeled in hybrid simulations. Thus, the advantages and applicability of hybrid simulations diminish due to the inaccurate modeling of the numerical substructures. To address the aforementioned problem, this study develops a gradient-based parameter identification(PI) method for online model updating to advance hybrid simulation. A novelty of the proposed PI method is to fix parts of parameters along identification stages of different stress states, thereby resulting in a reduction in the number of design variables to be determined. The time consumed in computing the gradients can be reduced accordingly to improve the identification efficiency. To validate the proposed PI method, numerical verification using simulated hybrid tests were conducted with a five-story steel frame equipped with buckling-restrained braces on a shaking table at E-Defense in Japan in 2009. The numerical verification has confirmed the effectiveness of the proposed parameter identification method for advanced hybrid simulation with on-line model updating. |
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