ESMD-based stability analysis in the progressive collapse of a building model: A case study of a reinforced concrete frame-shear wall model

Aiming to estimate the degree of damage influences on a building model, this paper proposes to adopt the extreme-point symmetric mode decomposition (ESMD) method to conduct a stability analysis in the progressive collapse of a building model. As a representative case, a five-story reinforced concrete frame-shear wall building model with a destructible glass wall, is studied in detail. The input signals of key locations on the building model are obtained by high-speed videogrammetry (HSV). First, the original complex response signal is decomposed into a series of simple signals called intrinsic mode functions (IMFs) by a mode symmetric about the maxima and minima points. Second, the instantaneous frequency of each IMF is obtained to perform a stability analysis by a direct interpolation (DI) algorithm. Third, instantaneous energy is obtained to conduct a stress analysis for the key locations of the building model. The results demonstrate that the proposed method has an ability to perform a stability analysis in the progressive collapse of a building model efficiently.