Experimental data are presented for four different types of wood-I-joists with OSB webs and their strengths subjected to 60 months of sustained loading. All the joists tested are 7010 mm long and approximately 300 mm deep with various flange materials and dimensions: laminated veneer lumber, strand lumber, and two different sizes of solid wood. The joists were loaded in a four-point arrangement to produce a constant moment mid-section. The creep tests were conducted in an indoor (dry) uncontrolled environment at a constant temperature of 20°C, and at load level ranges from 26% to 44% of the nominal bending capacity of the joists, and with the relative humidity varied from about 25% to 65%. After 60 months of sustained loading, the creep deflection ranges from 60% to 235% of the joist's elastic deflection. However, 60 months of sustained loading was found to have no significant effect on the elastic stiffness and the bending moment capacity of the joist.

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Conference Canadian Society for Civil Engineering - 30th Annual Conference: 2002 Chellenges Ahead
Citation
Bach, L., Cheng, J.J.R., Khoo, H. A, & Bach, J.B. (2002). Performance of wood I-joists under moderate sustained loading for 5 years. Presented at the Canadian Society for Civil Engineering - 30th Annual Conference: 2002 Chellenges Ahead.