This video is the result of a project conducted by the University of Washington and the University of Illinois Urbana-Champaign. The research was funded by the National Science Foundation through the NEES Research Program and by the Charles Pankow Foundation. Visit https://www.youtube.com/user/NEESRWallProject for more videos or https://nees.org/groups/nees_2005_0104/wiki for additional information on the project.
This video shows the damage to reinforced concrete planar wall (rectangular cross-section) specimen PW2, tested as part of the NEESR Complex Wall Project. The specimen reached a drift of 1.5% at the top of the third floor (corresponding to a drift of 1.9% at the 10th floor (see below)) prior to fail at 1.05% drift in the opposite loading direction due to a compressive failure (extensive bar buckling and core crushing) of the left boundary element.
The image shows the bottom story (3 feet) of a 3-story 1/3 scale specimen. The wall is 10 feet long and 6 inches thick. Longitudinal reinforcement is concentrated in boundary elements and spliced in the lower half of the first floor. Lateral and overturning forces were applied to simulate the base reactions of a 10-story wall with a uniform lateral force distribution. A cyclic displacement history was applied to the walls.
The bottom center figure shows the base moment vs 3rd drift. Figures to the left and right indicate the progression of yield under compressive and tensile strains, respectively. An open circle indicates a strain gauge that reached the yield strain of the steel. A filled circle indicates a strain gauge that has reached the strain hardening strain. A triangle indicates yield stress of the steel was reached without the yield strain having been reached. The color of the marker indicates if yield of the gauge occurred first in tension (red) or compression (blue). The solid lines represent the floor levels and the dashed line indicates the top of the spliced region.