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- Title
Bending creep of small samples from parallel strand lumber.
- Authors
Lee, Andy W. C.; Yihai Liu
- Abstract
Parallel strand lumber (PSL) is an engineered wood product intended for a wide variety of structural applications, such as rafters, joists, and headers. Using commercially produced southern pine PSL and yellow-poplar PSL, this study was carried out to assess the bending creep of small PSL samples under different environmental conditions and to develop models for predicting their long-term creep. The major findings are summarized as follows. At a constant temperature, creep deflections in PSL increase with the increase of relative humidity levels. PSL shows greater creep deflections when exposed to the outdoor environment than to the indoor environment. Creep deflections in PSL increase with increasing load levels. In general, southern pine PSL shows lower creep deflections than yellow-poplar PSL under the same environmental condition and load level. Edgewise direction in PSL exhibits lower creep deflections than flatwise direction, due mainly to the fonner having higher bending stiffness than the latter. Four-element model can closely predict the creep deflections in PSL under a constant condition.
- Subjects
PARALLEL strand lumber; ENGINEERED wood; COMPOSITE materials; CREEP (Materials); HUMIDITY; SOUTHERN pines
- Publication
Forest Products Journal, 2007, Vol 57, Issue 9, p73
- ISSN
0015-7473
- Publication type
Article