Abstract:
This paper presents a simple new method to calculate column-interaction
diagrams, which takes into account slenderness effects. The
method consists of a simple incremental-loading algorithm that traces
the load-deflection curve at constant eccentricity of the axial load.
The column failure is defined for design purposes as the peak of the
diagram of axial load versus midlength bending moment at constant
load eccentricity. The tangent modulus load is found to be approximately
equal to the peak load of a column with load eccentricity 0.0}
of the cross-sectional thickness and represents a lower bound for the
maximum loads at still smaller eccentricities. Strain irreversibility at
unloading can be taken into account but its effect is very small. The
method is compared with the AC} moment magnification method and
with the CEB model column method based on moment-curvature relations.
The agreement with the CEB method is very close, but with
respect to the ACI method there are large discrepancies.
Citation:
Bazant, Z. P., Cedolin, L., & Tabbara, M. R. (1991). New method of analysis for slender columns. ACI Structural Journal, 88(4), 391-401.
