Assessment of Structural Systems Evaluation Methods Based on Local Seismic Demands

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Title: Assessment of Structural Systems Evaluation Methods Based on Local Seismic Demands

Author(s): H. S. Lew and S. K. Kunnath

Publication: Special Publication

Volume: 209

Issue:

Appears on pages(s): 771-790

Keywords: dynamic analysis; earthquake engineering; nonIinear static procedures; performance-based design; story drift

Date: 9/26/2002

Abstract:
This paper examines the effectiveness of nodinear static procedures for seismic response analysis of buildings. Nonbm static procedures are recom- mended in FEMA 273 (Federal Emergency Management Agency-Guidelines for Seismic Rehabilitation of Buildings) for assessing the seismic performance of buildings for a given earthquake hazard representation. Three nonlinear static procedures specified in FEMA 273 are evaluated for their ability to predict defonnation demands ia terms on inter-story drifts and potential failure mechanisms. Two steel and two reinforced concrete buildings were used to evaluate the procedures. Strong-motion data recorded during the Northridge,earthquake are available for these buildings. Tfie study shows that nonlinear static procedures are not effective in predicting inter-story drift demands compared to nonlinear dynamic procedures. Nonlinear static procedures were not able to capture yielding of columns in the upper levels of one of the sekted buildings. This inability can be a sienificant source of concern in identifying local upper story failure mechanisms.