Plastic Mechanism Design of Unbraced Low-Rise Concrete Frames

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Title: Plastic Mechanism Design of Unbraced Low-Rise Concrete Frames

Author(s): F. N. Rad and T. J. Gavin

Publication: Journal Proceedings

Volume: 77

Issue: 5

Appears on pages(s): 321-328

Keywords: columns (supports); frames; hinges (structural); limit design method; reinforced concrete; strength; structural design; ultimate strength method.

Date: 9/1/1980

Abstract:
Applicability of limit design concepts to design of low-rise unbraced concrete frames is investigated. Two pairs of frames to represent the lowest level of a 5- and 7-story structure were designed and tested under column, beam, and lateral loads. In each pair, one frame was designed by the ultimate strength design method, and the other by a limit design method. "Building Code Requirements for Reinforced Concrete (ACI 318- 77)" provisions were followed in the design and detailing of frame cross sections, Measured frame capacities exceeded the design loads by an average of 53 percent and 26 percent for frames designed by the ultimate strength design method and the limit design method, respectively. Analytical and experimental results indicate that it is feasible to use limit design methods employing a plastic mechanism approach in designing low-rise unbraced concrete frames.