SEISMIC PERFORMANCE OF BEAM-COLUMN SUBASSEMBLIES WITH HIGH STRENGTH STEEL REINFORCEMENT

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Title: SEISMIC PERFORMANCE OF BEAM-COLUMN SUBASSEMBLIES WITH HIGH STRENGTH STEEL REINFORCEMENT

Author(s): Barbara Chang, Tara Hutchinson, Xiang Wang, and Robert Englekirk

Publication: Structural Journal

Volume: 111

Issue: 6

Appears on pages(s): 1329-1338

Keywords: frame beams; high-strength reinforcing steel; reinforced concrete

Date: 11/1/2014

Abstract:
Based on current special moment frame design requirements, reinforced concrete beam-column joints in frame buildings are designed to resist seismic loads, yet they suffer severe damage in the form of plastic hinging in the beams when design limits are attained. In this paper, the full-scale experimental reversed cyclic behavior of an alternative subsystem incorporating high-strength reinforcing in a beam-column joint is summarized. Observations from the experiment indicate that the specimen exhibits stable hysteretic behavior up to approximately 5.5% drift ratio. At design plastic rotations expected of conventional beam-column joints, the specimen exhibited no joint spalling with only minor damage and flexural cracks well extended along beam members. In addition, a design-oriented numerical model of the test subassembly is described and shown to reasonably capture the global and local behavior of the specimen.