Behavior of Reinforced Concrete Columns Under Variable Axial Loads: Analysis

This article analyzes the effects of the magnitude and pattern of the axial load on the lateral response of bridge piers and compares those effects with the authors' experimental findings reported in a companion paper (ACI Structural Journal, January-February 2004). A computer program developed to address the analytical needs of the research was used for the study. The program included a fiber-based moment-curvature analysis, a plastic hinge method addressing load variations, material models calibrated against test data, and new hysteretic rules. The program was able to predict the column response reasonably well under various loading patterns. Predictions in close agreement with the experimental evidence revealed that the effects of the magnitude and path of axial load were significant. The authors conclude that these effects should be addressed in design practice where seismic excitation in lateral and vertical directions is a concern. They note that using proper models and rules for monotonic and hysteretic behavior of material and a reasonable assumption on curvature distribution similar to that developed and used in this study, along with a relatively simple analytical approach, can simulate the behavior of the specimen with an acceptable accuracy.


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  • Accession Number: 01003979
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 19 2005 7:21AM