Effect of Tie Spacing on Inelastic Buckling of Reinforcing Bars


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Title: Effect of Tie Spacing on Inelastic Buckling of Reinforcing Bars

Author(s): S. T. Mau

Publication: Structural Journal

Volume: 87

Issue: 6

Appears on pages(s): 671-677

Keywords: buckling; columns (supports); finite element method; loads (forces); reinforcing steels; strain hardening; stress-strain relationships; ties (reinforcement); Structural Research

Date: 11/1/1990

The inelastic buckling and load-carrying capacity of reinforcing steels in concrete columns are studied by an accurate finite element method. A critical tie spacing exists for reinforcing steels under monotonic loading. The peak loads for cases with a spacing below and above the critical spacing differ greatly. Below the critical spacing, the tangent modulus theory used in previous works for tie spacing and tie stiffness determination may be applied; above the critical spacing, the theory may not be expected to predict the load-carrying capacity accurately. The critical spacing varies with the shape of the stress-strain curve of the reinforcing steel. A parametric study is carried out to establish the range of critical spacing for typical high-strength steels.