Title:
Study of Moving Beam Plastic Hinging Zones for Earthquake-Resistant Design of Reinforced Concrete Buildings
Author(s):
Bahjat Abdel-Fattah and James K. Wight
Publication:
Structural Journal
Volume:
84
Issue:
1
Appears on pages(s):
31-39
Keywords:
beams (supports); columns (supports); connections; cyclic loads; earthquake-resistant structures; hinges (structural); joints (junctions); reinforced concrete; reinforcing steels; stiffness; structural design; strength; Structural Research
DOI:
10.14359/2767
Date:
1/1/1987
Abstract:
Current design practice usually leads to the formation of plastic hinges in the beam regions adjacent to the column, which usually causes stiffness and strength deterioration to take place in the joint. Joint deterioration can be eliminated by moving beam yielding away from the connection. A technique for moving the plastic hinging zone one effective beam depth away from the column face was experimentally investigated. In this investigation, twelve full-size interior beam-column subassemblages were tested under quasi-static loading that was intended to simulate earthquake input. Based on the test results, it was concluded that intermediate longitudinal beam reinforcement combined with extra top and bottom steel in the beam over a specific beam length adjacent to the joint can successfully move the plastic hinge away from the column face, provided that the joint shear force introduced by the intermediate reinforcement does not exceed 30 percent of the total developed joint shear force.