Stiffness and Energy Degradation of Walls Constructed with Green Wood.
In this study, tests have been conducted on woodframe shear walls to characterize the degradation of stiffness and energy dissipation that occurs as walls dry over long periods of time. Eight plywood walls were constructed with “moist” lumber; four were tested within days of construction, while four were stored in a weatherproof environment between 18 and 24 months before being tested. The tests were conducted using a sequential phased displacement command input at a rate of 1.0 Hz. The comparison of tests results indicate that the ultimate load capacity of the wall is unaffected by drying over time; however, the effective wall stiffness decreases by 15 – 30 % at displacement levels below ultimate load. Furthermore, the energy dissipation capacity of the wall decreases by 20 – 30% at the same displacement levels. The findings presented show that the stiffness and energy dissipation capacity of wood shear walls constructed with green lumber will degrade over time.
|Main Author:||Dinehart, David W.|
|Other Authors:||Shenton III, Harry W., Carlson, Sara.|