Displacement Amplification Factor for Seismic Design Provisionsby Chia-Ming Uang, Northeastern Univ,
Ahmed Maarouf, Northeastern Univ,
Abstract: To estimate the maximum roof and story drifts occurring during severe earthquakes, the UBC and NEHRP use 3Rw/8 and Cd respectively as the displacement amplification factor (DAF) to amplify elastic design drifts. A comparison of several seismic design codes shows that both the UBC and NEHRP's DAF are very low. A study conducted on seismic response of four instrumented buildings indicates that maximum drifts developed in severe earthquakes are much higher than those predicted by UBC and NEHRP. Recommended DAF values for building frames are presented.
Subject Headings: Seismic design | Seismic tests | Drift (structural) | Elastic analysis | Plastic design | Load and resistance factor design | Building design
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