Title:
Relocating Beam Plastic Hinging Zones for Earthquake Resistant Design of Reinforced Concrete Buildings
Author(s):
Mohammed S. Al-Haddad and James S. K. Wight
Publication:
Structural Journal
Volume:
85
Issue:
2
Appears on pages(s):
123-133
Keywords:
beam-column frame; buildings; connections; ductility; dynamic characteristics; earthquake resistant structures; structural design; hinges (structural); reinforced concrete; Structural Research
DOI:
10.14359/2673
Date:
3/1/1988
Abstract:
In this analytical investigation, the feasibility and consequences of modifying beam reinforcement to relocate the potential location of beam plastic hinging zones, which could form during earthquake loading, have been studied. Three frames with varying beam spans and numbers of stories were used in the study. The dynamic response of each frame under two different earthquake records was studied for two design cases. In one case for each frame, the beam-hinging zone was assumed to occur at the column face, and in the other case the beam-hinging zone was analytically moved one beam depth away from the column face. Another variable for the case of the moved hinging zone was the relative moment strength at the column face to that in the hinging zone. Results indicated that seismic response of reinforced concrete buildings was sensitive to relocating the beam-hinging zone away from the column face. The degree of sensitivity, however, was not uniform and varied widely depending on the response parameter, beam span length, beam flexural strength at the relocated plastic-hinging zone, and input earthquake record.