Impact of Seismic Input on Strain/Displacement Response of Reinforced Concrete Members and Frames

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Title: Impact of Seismic Input on Strain/Displacement Response of Reinforced Concrete Members and Frames

Author(s): Aidcer L. Vidot-Vega and Mervyn Kowalsky

Publication: Structural Journal

Volume: 108

Issue: 2

Appears on pages(s): 178-187

Keywords: cyclic loads; load history; reinforced concrete frames; seismic accelerations; strains

Date: 3/1/2011

Abstract:
This is a study on the effect of displacement histories on the relationship between material strains and deformation parameters such as displacement and drift for reinforced concrete (RC) moment frame structures. The study is divided into two phases: 1) a phase that considers RC column members subjected to symmetrical and asymmetrical reversed cyclic displacement and seismic time histories. Columns with 2 and 4% longitudinal steel ratios and 5 to 20% axial load ratios are analyzed; and 2) a phase that considers moment frames subjected to seismic acceleration time histories. A total of five moment frame models are analyzed. The results are compared to monotonic analyses and simplified design expressions that were previously developed by the authors. The analysis results support the use of monotonic section analyses to define the envelope of seismic response because the relationship between strains and displacements of seismically well-designed members appears to be minimally affected by loading history.