Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2013-09-01

Journal: ACI STRUCTURAL JOURNAL

Included Journals: SCIE

Volume: 110

Issue: 5

Page Number: 755-765

ISSN: 0889-3241

Key Words: column; nonlinear analysis; reinforced concrete; second-order effect

Abstract: The moment magnifier method was introduced to analyze the second-order effect of slender columns, which can eliminate extensive calculations based on the solution to a differential equation. The formula adapted in this method incorporates the effective flexural stiffness El and equivalent uniform moment diagram factor C-m, which are influenced by eccentricity and slenderness of columns. For a non-sway reinforced concrete column, by subdividing the column into segments with different stiffness ratios and establishing a differential equation for each segment, a set of nonlinear equations illustrated by the deformation of segments was derived based on the deformation compatibility. With the force equilibrium conditions, new nonlinear equations for El and C-m were then developed for the design of the slender reinforced concrete column. Comparison between the experimental data from different sources showed that the proposed equations can provide a better response prediction than the equations adopted in the ACI code for columns.