Effects of Transverse Reinforcement on Seismic Performance of Columns

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Title: Effects of Transverse Reinforcement on Seismic Performance of Columns

Author(s): A. Azizinamini, W. G. Corley, and L. S. P. Johal

Publication: Structural Journal

Volume: 89

Issue: 4

Appears on pages(s): 442-450

Keywords: columns (supports); earthquake-resistant structures; moments; loads (forces); reinforced concrete; tests; Structural Research

Date: 7/1/1992

Abstract:
Columns in building frames are normally designed to prevent both hinging and crushing during an earthquake. However, columns in buildings subjected to severe earthquakes may sometimes be subjected to forces that cause hinging. The possibility of yielding occurring at column ends makes it important to insure that columns are capable of behaving in a ductile manner. To investigate the effects of different transverse reinforcement details on the behavior of rectangular and circular reinforced concrete columns, and to further evaluate simplification of some of the detailing requirements, 12 full-scale columns were tested. Variables included the level of axial load, amount and type of transverse reinforcement, and details of transverse reinforcement. Results indicate that flexural capacity of a column increases with axial load but ductility reduces substantially. Increase in the amount of transverse reinforcement results in increased ductility. Details of transverse reinforcement, including hook bends and hook extensions, can be further simplified. In all tests, limiting strain was well above the 0.003 generally assumed in design.