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Performance of reinforced concrete columns confined with spiral reinforcement
Author(s) -
Damodaran Chitra Mitra,
Rugmini Bindhu Kochunarayana
Publication year - 2021
Publication title -
the structural design of tall and special buildings
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.895
H-Index - 43
eISSN - 1541-7808
pISSN - 1541-7794
DOI - 10.1002/tal.1859
Subject(s) - ductility (earth science) , spiral (railway) , reinforcement , structural engineering , stiffness , materials science , seismic loading , geotechnical engineering , reinforced concrete , column (typography) , geology , composite material , engineering , connection (principal bundle) , mechanical engineering , creep
Summary The study proposes a practical strengthening method for improving the seismic behavior of reinforced concrete square columns using spiral as lateral reinforcement in moderate seismic zone regions. Two specimens one without ductile detailing and the other with ductile detailing designed as per Indian standard specifications and six specimens with spiral ties (in one direction and cross directions) at 25°, 35°, and 45° of inclination were tested under constant axial load and cyclic lateral loads to study the feasibility of the provision of spiral ties as a seismic‐strengthening method. The important variable used was the angle of inclination of the spiral bars. Test results revealed that the column specimen strengthened with cross spirals at 25° had almost similar performance and ductility behavior when compared with the control specimen with ductile detailing and specimen strengthened with cross spirals at 35° had better performance and ductility behavior when compared with the control specimen without ductile detailing and can be adopted in moderate seismic regions. Considering the enhanced behavior, such as the strength, stiffness, and ductility, along with the construction easiness, for better performance of columns in moderate seismic zones, angle of inclination of 35° is sufficient.