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Ductility of reinforced concrete sections with confined compression zones
Author(s) -
Desayi Prakash,
Sundara Iyengar K. T. Raja,
Reddy K. Nagi
Publication year - 1975
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.4290040202
Subject(s) - ductility (earth science) , structural engineering , curvature , materials science , compression (physics) , beam (structure) , reinforced concrete , moment (physics) , reinforced solid , composite material , geotechnical engineering , geology , engineering , geometry , mathematics , physics , creep , classical mechanics
Confinement of concrete in circular spiral steel binders imparts to it considerable ductility and also some increase in strength. This property can be utilized in designing concrete structures to withstand seismic forces where the members are required to possess not only strength but also energy absorbing capacity. Assuming the stress‐strain behaviour of confined concrete as elastic‐plastic, the ductility factor for strain and the strength factor (denoting increase in strength) have been determined for concrete confined to different degrees. Similarly, assuming the moment‐curvature behaviour of reinforced concrete sections with confined compression concrete to be elastic‐plastic, the ductility factor for curvature has been determined for such beams. The computed moment‐curvature plots have been found to compare satisfactorily with tests on 18 beams. Ductility factors for curvature of singly and doubly reinforced concrete sections with compression concrete confined to different degrees have been determined and presented for certain typical cases. Such plots would be of use in designing reinforced concrete beam sections for required ductility.