Time-Dependent Characteristics of Prestressed Wood Beams.

摘要

To evaluate the change in prestressing force due to time-strain characteristics of the wood,matched pairs of prestressed beams and nonprestressed control beams were loaded for eight years. Beams were loaded to net stress levels of 1,600and 2,500 p.s.i. (pounds per square inch). The time-deflection performance of the matched pairs was consistently similar and there was no significant loss in the prestressing force. These data indicate that prestressed beams should give adequate performance in structures. (Author)