Effect of Shear Reversals on Dynamic Demand and Resistance of Reinforced Concrete Elements

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Title: Effect of Shear Reversals on Dynamic Demand and Resistance of Reinforced Concrete Elements

Author(s): S. Pujol and M.A. Sozen

Publication: Special Publication

Volume: 236

Issue:

Appears on pages(s): 43-60

Keywords: capacity spectrum; cyclic load; reinforced concrete

Date: 5/1/2006

Abstract:
The effect of shear reversals on the drift capacity of reinforced concrete columns is studied comparing computed limiting drift for monotonically increasing load and limiting drift for cyclic loads. The latter is estimated using models calibrated with data from tests of columns subjected to shear reversals. The comparison indicates that, within the ranges considered, shear reversals cause stiffness decay at displacements that can be as low as one quarter of the displacement capacity for monotonically increasing shear. The effects of stiffness decay on the demand for a single degree of freedom system subjected to strong ground motion are studied. The formulations considered indicate that, if relative reduction in lateral stiffness is associated with an equal relative reduction in damping, shear reversals affect drastically the resistance of the system but not dynamic demand. Ranges are given defining a domain within which the effects of shear reversals may be ignored.