Slender Reinforced Concrete Bridge Towers under Cyclic Lateral Load
Publication: Journal of Structural Engineering
Volume 117, Issue 2
Abstract
The nonlinear behavior of a cable‐stayed‐bridge tower with slender columns is generally affected not only by material nonlinearity, but by geometric nonlinearity as well. This geometric nonlinear effect is accentuated by a sustained gravity load, an increase of lateral load and a stiffness reduction of the structure. A series of static analyses up to failure are conducted with various parameters that govern the nonlinear behavior of an A‐shaped bridge tower, under sustained gravity load combined with seismic lateral load perpendicular to the longitudinal axis of the bridge. The present study particularly focuses on the influence of creep deformation due to gravity load and of cyclic lateral load on the ultimate strength and deformation characteristics of the tower and the applicability of the current “moment magnifier method” in the American Concrete Institute (ACI) code to the analysis and design of this type of structure. Analytical results indicate that no significant effect of creep and cyclic load is observed on the ultimate strength behavior for towers in the range of slenderness ratio l/r less than 100 and having an axial stress due to gravity load of less than 0.2. The current moment magnifier method gives results on the conservative side except for the low slenderness region in which considerable moment redistribution among legs takes place due to axial force variation.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 117 • Issue 2 • February 1991
Pages: 325 - 342
Copyright
Copyright © 1991 ASCE.
History
Published online: Feb 1, 1991
Published in print: Feb 1991
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