Title:
Residual Seismic Capacity of Reinforced Concrete Walls with Unconfined Boundaries
Author(s):
Jorge F. Moscoso, Matías A. Hube, and Hernán Santa María
Publication:
Structural Journal
Volume:
118
Issue:
5
Appears on pages(s):
205-220
Keywords:
crack width; cyclic; reinforced concrete (RC); residual capacity; seismic behavior; wall
DOI:
10.14359/51732830
Date:
9/1/2021
Abstract:
An experimental study was conducted to evaluate the residual
seismic capacity of reinforced concrete (RC) walls with unconfined
boundaries. Six walls were subjected to constant axial load and
cyclic lateral loading protocols. Three walls were tested under
one cyclic lateral loading protocol, and the other three walls
were tested under two cyclic lateral loading protocols to induce
initial damage. Primary test variables were the shear span-depth
ratio and the target drift ratio of the initial loading protocols. Test
results indicate that the six wall specimens showed a flexural dominated behavior. The residual crack widths measured in the three walls tested with initial damage were only 6% of the crack width suggested by FEMA 306 for the identified damage severity levels. The effective stiffness decreased significantly due to previous
damage. Finally, the maximum strength was not considerably affected and the lateral drift capacity was not reduced due to previous damage.