Abstract
Seismic-isolation is an appealing design alternative for enhancing both the seismic safety and functionality of building structures against large earthquake motions. However, large floor vertical accelerations was observed in the conventionally designed base-isolated buildings. Previous researches indicate that column and beam vibrations should be considered when evaluating the floor vertical accelerations. The column and beam vibrations lead the representation of the Single Degree of Freedom system and corresponding spectra analysis ineffective. To evaluate the vertical floor vibration of building structures, the generic vertical frame (GVF) model was developed in this study. Comparing with the conventionally frame analysis model, the GVF model significantly reduced the DOFs. The GVF model is capable of estimating the vertical acceleration at interior spans for multiple span structures with errors not more than twenty percent, and becomes more accurate for structural systems with strong columns.
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