Seismic Performance of Reinforced Concrete Piers with Bond-Controlled Reinforcements

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Title: Seismic Performance of Reinforced Concrete Piers with Bond-Controlled Reinforcements

Author(s): Govinda Raj Pandey and Hiroshi Mutsuyoshi

Publication: Structural Journal

Volume: 102

Issue: 2

Appears on pages(s): 295-304

Keywords: bond; columns; ductility; reinforced concrete; seismic behavior; shear

Date: 3/1/2005

Abstract:
An extensive experimental investigation was carried out to examine how controlling the bond of the longitudinal reinforcements can improve seismic performance factors, such as shear strength and ductility, of reinforced concrete (RC) structures. The experiment employed 15, 300 x 300 mm square RC columns tested under reversed cyclic loading. The columns were of six different bond conditions, varying from perfect bond, with the use of ordinary deformed bars, to perfect unbond. The other test variables included the shear span-depth ratio, shear to flexural strength ratio, and the length of unbonded region. The results of the experiment revealed that the failure mode at the ultimate state could be changed from shear to flexure by reducing the bond strength of the longitudinal bars. The test results also showed that RC columns reinforced with bond-controlled bars had significantly better shear strength and ductility than RC columns reinforced with ordinary bars.