Creep behavior of solid-sawn and wood I-joist floors

R. W. Roeder, H. B. Manbeck, John Jack Janowiak

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The creep responses of twelve individual I-joists and six wood-framed floor systems were measured for a duration of approximately 120 days. The I-joists and floor systems were divided into two sets, each having six individual I-joists and three floor systems. The study I-joists were fabricated with laminated veneer lumber (LVL) flanges and oriented strand board (OSB) webbing. The floor systems included one floor framed with No. 1 Southern yellow pine floor joists, which served as a control, and two floors constructed with wood I-joists. All floors were sheathed with OSB panels, nailed and glued to the top edges of the joists, and were designed to carry a total dead plus live load of 2.40 kPa (50 psf). A sustained load of 0.96 kPa (20 psf) was applied for the duration of the experiment. Relative humidity and temperature were maintained between 34% and 60% and between 22°C and 26°C (72°F and 79°F), respectively. The overall average creep ratios (total deflection/instantaneous deflection) of the I-joists, I-joist floor systems, and solid-sawn floor systems were 1.66, 1.53, and 1.71, respectively. The creep ratios of the I-joist and solid-sawn floors were not significantly different (p > 0.05). Observed creep ratios of the solid-sawn floors were greater than those reported by prior studies for nailed solid-sawn floors; observed creep ratios for the I-joist floors were lower than those reported by prior research for a similar, but not identical, I-joist floor system.

Original languageEnglish (US)
Pages (from-to)341-349
Number of pages9
JournalTransactions of the American Society of Agricultural Engineers
Issue number1
StatePublished - Jan 1 2005

All Science Journal Classification (ASJC) codes

  • Agricultural and Biological Sciences (miscellaneous)


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