Abstract »The Canadian Forces (CF) maintains close to 100 wooden Warren Truss buildings, made of Douglas fir, that were initially constructed as temporary structures during the World War II Era. Within a few months of construction, significant shrinkage and cracking began to take place. Various repairs and inspection methods have been tried over the years but the remaining structures continue to pose structural integrity concerns. Regular inspections are not sustained and recommended repairs are often costly and over conservative. A Structural Health Monitoring (SHM) system is applied to these structures to help guarantee building safety.
This work investigated applicable methods of SHM on wooden Warren Truss structures. The aim is to attain an understanding of the long-term performance of wooden Warren trusses under service load as well as detect and identify the severity of damage. The evaluation of various sensor types and methods of data collection are reviewed in order to develop and select a suitable SHM system. Electrical strain gauges have been in place since 2012 and continue to provide meaningful results. Fiber optic sensors have also been recently installed alongside the electrical strain gauges with measurement points on three trusses. This paper presents the results of the preliminary study and its conclusions.