American Society of Civil Engineers

Wood Members Strengthened with Mechanically Fastened FRP Strips

by Dwight D. Dempsey, (Bridge Engr., Figg Bridge Engineers, Inc., Tallahassee, FL 32301) and David W. Scott, (corresponding author), (Assoc. Prof., Dept. of Civ. Engrg., Georgia Inst. of Technol. Savannah Campus, Savannah, GA 31407-3039 E-mail:

Journal of Composites for Construction, Vol. 10, No. 5, September/October 2006, pp. 392-398, (doi:

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Document type: Journal Paper
Abstract: The demand for a rapid technique to strengthen existing wood bridge structural elements is evident in military and civilian sectors. An experimental program was undertaken to evaluate the feasibility of increasing the flexural strength of Southern Pine wood members using mechanically fastened fiber-reinforced polymer (FRP) strips. Three control specimens and twelve composite members were fabricated using two FRP material types with varying fastener spacing and tested to failure. The experimental results show that the proposed strengthening technique induced a gradual failure of the composite members and increased ultimate moment, initial stiffness, and ductility over that found for the control specimens. Increased fastener spacing decreased member ultimate moment, initial stiffness, and ductility ratio. The moisture content of the wood material greatly affected the ductility ratio of the wood members.

ASCE Subject Headings:
Composite materials
Fiber reinforced polymer
Wood structures