1. Análisis modal operacional de un edificio de concreto reforzado mediante métodos subespaciales estocásticos.
- Author
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Yi Cheng Liu-Kuan and Carlos Esquivel-Salas, Luis
- Subjects
- *
CONCRETE construction , *VIBRATION tests , *MODE shapes , *REINFORCED concrete , *FRAMING (Building) - Abstract
The objective of this study is to identify the operational modal parameters of a six-story reinforced concrete frame building. This is done through roving sensor instrumentation technique while comparing the two main variations of the stochastic subspace identification method: covariance-based (SSI-COV) and data-based (SSI-DATA) The experimentation is executed in order to contrast their effectiveness to identify the dynamic system of concrete buildings from ambient vibration tests. The instrumentation of the building was carried out with four triaxial strong motion accelerographs. One stayed fixed on the top floor as a reference node for modal shape merging. The other three were moved from floor to floor to recover the operational modal shapes throughout the building at the observation points. This resulted in a total of six test configurations that lasted 20 min each. A total of nine modes were identified with the SSI-COV method, with successful merging and recovering of their complete modal shapes. However, modes could not be identified correctly with SSIDATA, for data collected on the lower floors, so it was not possible to recover the complete mode shapes of the building. In this case, it is concluded that SSI-COV has better capacity for modal identification from ambient vibrations collected via roving accelerographs in buildings. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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