Glulam Design Criteria for Temporary Structures

by Lawrence I. Knab, (A.M.ASCE), Research Civ. Engr.; Structures and Materials Div., National Bureau of Standards, U.S. Dept. of Commerce, Washington, D.C.,
Russell C. Moody, Research Project Leader; Engrg. Wood Structures, Forest Products Lab., U.S. Dept. of Agr., Madison, Wisc.,

Serial Information: Journal of the Structural Division, 1978, Vol. 104, Issue 9, Pg. 1485-1494

Document Type: Journal Paper


If temporary structures having lives of 2 yr-5 yr are designed using criteria for permanent structures with lives of 50 yr-75 yr, overly conservative design can result. This paper presents a systematic, rational basis for developing criteria for glued-laminated timber temporary bridges and buildings. Second moment reliability theory, which requires estimates of the mean and coefficient of variation of resistance and load, is used to compute measures of safety, called safety index values. These index values are computed for permanent and temporary structural elements. Allowable stresses for temporary structures are determined by choosing corresponding safety index values that will provide adequate safety relative to the safety of permanent structures, while reflecting the temporary nature of the structures. Examples of how allowable flexural stresses are developed for bridges and building are given.

Subject Headings: Structural safety | Laminated materials | Temporary structures | Bridge design | Infrastructure construction | Safety | Maximum loads | Building design

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