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Evaluation of Displacement Amplification Factor For Seismic Design Codes

by Chia-Ming Uang and A. Maarouf

Uang, Chia-Ming, and A. Maarouf (1992). Evaluation of Displacement Amplification Factor For Seismic Design Codes. SMIP92 Seminar on Seismological and Engineering Implications of Recent Strong-Motion Data, p. 5-1 - 5-10.

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Abstract

To estimate the roof and story drifts occurring during severe earthquakes, the Uniform Building Code (UBC) uses 3Rw/8 as a displacement amplification factor (DAF) to amplify elastic design drifts. A comparison of several seismic design codes shows that UBC's DAF is very low. A study conducted on four instrumented buildings indicates that the maximum story drifts developed in severe earthquakes are much higher than that predicted by the UBC. This study also shows that the DAF of multi-degree-of-freedom systems is similar to that of single-degree-of-freedom systems.