Displacement Amplification Factor for Seismic Design Provisions

by Chia-Ming Uang, Northeastern Univ,
Ahmed Maarouf, Northeastern Univ,

Document Type: Proceeding Paper

Part of: Structural Engineering in Natural Hazards Mitigation


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 | Plastic design | Displacement (mechanics) | Building design | Earthquakes | Earthquake resistant structures | Drift (structural)

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