Finite Segment Method for Biaxially Loaded RC Columns

by Soliman I. Al-Noury, Asst. Prof. of Civ. Engrg.; King Abdulaziz Univ., Jeddah, Saudi Arabia,
Wai F. Chen, (F.ASCE), Prof. and Head of Structural Engrg.; School of Civ. Engrg., Purdue Univ., West Lafayette, Inc. 47907,

Serial Information: Journal of the Structural Division, 1982, Vol. 108, Issue 4, Pg. 780-799

Document Type: Journal Paper


The finite segment method is applied here to solve biaxially loaded reinforced concrete columns. The column is treated as a space structure after segmentation. The sections are divided into finite elements of steel and concrete in order to calculate its tangent stiffnesses properties at different levels of strain. The segment stiffness relationship is computed by solving the governing differential equations about the principal axes of the cross section. Direct stiffness method is utilized to construct the whole column stiffness matrix (master stiffness matrix). Nonlinearities due to material plasticity and geometrical change are handled by an iterative procedure based on the modified tangent stiffness approach. Comparisons of failure load and deflection with biaxially loaded reinforced concrete column tests show an excellent correlation between theory and test data.

Subject Headings: Stiffening | Biaxial loads | Concrete columns | Load tests | Failure loads | Reinforced concrete | Matrix (mathematics) | Space structures

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