Hybrid simulation provides an efficient and effective experimental technique for seismic performance evaluation of structures under earthquakes.Conventional applications of hybrid simulation technique, however, often characterize the numerical substructures as deterministic thus unable to account for inherent uncertainties within civil engineering structures.In this study, a nonlinear single-degree-of-freedom structure with strength degradation was explored for experimental design of hybrid simulation to account for uncertainties in substructures.The polynomial chaos expansion (PCE) was utilized with Sobol sequence sampling to establish the meta-model to analyze the effect of parameter uncertainties on hybrid simulation of the SDOF structure close to collapse in terms of maximum displacement response.The leave-one-out (LOO) error analysis shows that the PCE meta-model enables good estimation of structural response statistics through hybrid simulation when the number of Sobol sequence samples reaches around 32.This study further demonstrates that the PCE has good potential for experimental design of hybrid simulation to account uncertainties.
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