Duration of Load

Duration of load, a concept expressing the interdependence between strength and time, is used in structural design codes for wood products. To obtain stresses suitable for loads lasting 10 years, short term test results are currently reduced 38 percent to allow for the anticipated decrease in strength. Recent work indicates that the time-strength relationship for wood is more complex than the present concept expresses; it may be too conservative for some wood uses, and too liberal for others. To direct and coordinate research in this area, a Steering Committee has been formed. Coordinated research will be necessary to achieve usable results within the next 3 to 5 years. The committee will meet two or three times each year to review progress and set priorities. At the first meeting in November, 1975 at the University of British Columbia research priorities were rated on a scale of 0 to 5.

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