Ductility Estimation of Exterior Beam-Column Subassemblages in Reinforced Concrete frames

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Title: Ductility Estimation of Exterior Beam-Column Subassemblages in Reinforced Concrete frames

Author(s): T. Kaku and H. Asakusa

Publication: Special Publication

Volume: 123

Issue:

Appears on pages(s): 167-186

Keywords: beams (supports); columns (supports); cyclic loads; ductility; frames; hoops; joints (junctions); reinforced concrete; shear properties; tests; Structural Research

Date: 1/1/1991

Abstract:
Reversed cyclic loading tests were carried out for 18 reinforced concrete exterior beam-column subassemblages designed in accordance with the principle that yielding of adjoining beam or column precedes joint shear failure. Column axial force, amount of joint hoop reinforcement, existence of intermediate column bars, and moment-resisting capacity ratio of beam to column were selected as experimental variables. Test results showed that the ductility of the subassemblages increased by column axial compressive force and the amount of the joint hoop reinforcements. The existence of the intermediate column bars was also effective in increasing the ductility. On the basis of thorough consideration of the test results, a critical cumulative displacement ductility factor was quantified as a function of the test variables, and was ascertained to be a very effective value to evaluate the aseismic performance of exterior beam-column subassemblages.