Title

Strength and ductility of concrete encased composite columns

Authors

Authors

S. El-Tawil;G. G. Deierlein

Comments

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Abbreviated Journal Title

J. Struct. Eng.-ASCE

Keywords

STRESS-STRAIN MODEL; CONFINED CONCRETE; ACI; Construction & Building Technology; Engineering, Civil

Abstract

Concrete encased composite column design provisions of the American Concrete Institute Code (ACI 318), AISC-LRFD Specification, and the AISC Seismic Provisions are reviewed and evaluated based on fiber section analyses that account for the inelastic behavior of steel and concrete, including the effects of strength and confinement on the concrete's stress-strain properties. Trial column designs are analyzed to evaluate their strength and ductility as a function of the ratio bf structural steel to gross column area, the nominal compression strength of concrete, and confinement of concrete by seismic hoop reinforcing. The analyses highlight known differences in the calculated nominal strength requirements between the ACI 318 and AISC-LRFD provisions and suggest a review of criteria used to establish the limits of the provisions. Compared to columns with low-to medium-strength concrete, columns with high-strength concrete(f'(c) = 110 MPa) are shown to rely to a greater degree on hoop reinforcement to provide the necessary ductility fbr seismic design.

Journal Title

Journal of Structural Engineering-Asce

Volume

125

Issue/Number

9

Publication Date

1-1-1999

Document Type

Article

Language

English

First Page

1009

Last Page

1019

WOS Identifier

WOS:000082007200009

ISSN

0733-9445

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