Repaired Pitch-Cambered Glulam Beams

by Vijaya K.A. Gopu, (M.ASCE), Asst. Prof. of Civ. Engrg.; Louisiana State Univ., Baton Rouge, La. 70803,

Serial Information: Journal of the Structural Division, 1981, Vol. 107, Issue 7, Pg. 1251-1262

Document Type: Journal Paper


Full-scale tests were conducted on two radially reinforced Douglas-fir beams. The two beams, each with a span of 30 ft., were tested only to initial failure prior to repairing. The two beams were repaired by radially reinforcing each by a different method. The radial reinforcing was similar to the field repair carried out on beams which fail in service. Each beam was instrumented for strain and deflection measurements and tested under working loads. In addition, load tests were conducted to beam failure, which occurred in radial tension for both beams. A factor of 1.6 was observed between the strength of the repaired beams and that of the unreinforced beams, clearly indicating that reinforcing a broken beam can restore the original load carrying capacity. The strength predictions for unreinforced and reinforced-unbroken test beams show that the American Institute for Timber Construction's current 15 psi radial stress limit for unreinforced Douglas-fir is quite conservative and that the 55 psi limit for reinforced Douglas-fir may be high for some beam configurations.

Subject Headings: Beams | Radiation | Rehabilitation | Load tests | Laminated materials | Failure analysis | Structural failures | Load factors

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