Tangent Stiffness Method for Biaxial Bending

by Sakda Santathadaporn, Struct. Engr.; Gannett, Fleming, Corddry, and Carpenter, Inc., Harrisburg, PA,
Wai F. Chen, Assoc. Prof. of Civ. Engrg.; Fritz Engrg. Lab., Lehigh Univ., Bethlehem, PA,

Serial Information: Journal of the Structural Division, 1972, Vol. 98, Issue 1, Pg. 153-163

Document Type: Journal Paper


A method for computing generalized stress-strain relationships (moment-thrust-curvature relationships) for metal column sections in biaxial bending is described. The analytical formulation of the force-deformation equations in terms of the rate of change leads to a linear relationship between these quantities. Solutions are obtained by the tangent stiffness method and a digital computer. The method is found to be extremely powerful and efficient for computer solution.

Subject Headings: Stiffening | Linear analysis | Computing in civil engineering | Stress strain relations | Moment (mechanics) | Metals (chemical) | Columns | Biaxial strength

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