Title:
Effects of Loading History on the Behavior of Reinforced Concrete Columns
Author(s):
Sasan Dolati
Publication:
Web Session
Volume:
ws_S24_SasanDolati.pdf
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
3/24/2024
Abstract:
Experimental studies have indicated that the lateral and axial behaviors of concrete columns under seismic excitation can be highly dependent on loading history, particularly at high-damage states. However, most experiments on concrete columns have used fully reversed cyclic loading protocols, with only limited tests in the literature exploring the effects of loading history. Due to the lack of experimental data, continuum finite element models were constructed to cover a relatively wide range of column parameters and failure modes, with primary objective of quantifying the effects of loading history on both lateral and axial degradation of concrete columns. Eighteen column models representing experimentally tested columns were subjected to varying lateral loading protocols, including different axial load levels. A total of 116 simulations were conducted to axial failure. The effects of the lateral loading protocols on strength and deformation capacities of concrete columns were quantified. Relations for estimating reductions in drift capacities due to increased lateral cycling are proposed for both initiation of lateral strength degradation and initiation of axial degradation.