Strength and Stiffness of Roof Diaphragms with Different Percentages of the Decking Edge-Glued

Four 20- by 60-toot sections, sheathed with nominal 3-inch laminated decking, were tested in lateral loading as diaphragms. Design of all roof sections was similar except for the different amounts of elastomeric adhesive used between the pieces of decking to resist shear forces and increase stiffness. For one diaphragm, adhesive was applied on the total lineal footage between the rows of decking; for two others, 59 and 26 percent of the lineal footage was edge-glued; for the fourth, no adhesive was used. Performances were compared by load deflection curves and maximum loads. At a deflection of 2 inches (1/360 of the 60-foot span), loads for the diaphragms with 100, 59, 26, and zero percentages of decking edge-glued were 1100, 867, 540, and 212 pounds per lineal foot of diaphragm width (PLF), respectively. Maximum loads sustained by the respective roof sections were 1500, 1250, 1000, and 450 PLF (for total load, multiply PLF by 40). Even after maximum load, or “failure”, the roof sections with adhesive retained good stiffness and near-maximum loads.

You must be logged in to download any documents. Please login (login accounts are free) or learn how to Become a Member