Computation model about the compression zone of wood beam has been proposed on the basis of the properties of the stress strain curve. According to the failure forms and computation model proposed, the calculation formulae of bending capacity of strengthened wood beams are deduced. The flexional tests of 36 wood beams reinforced with FRP(fiber reinforced polymer) are carried out. The results show that FRP in the tension zone of the wood beam can improve the capacity effectively. The effect of FRP in the compression zone on the bending capacity of timber beam is related to the strengthened forms. By comparison, the predictions of the formulas are shown to agree well with test data. The proposed formulas can be regarded as the reference for the design of reinforced wood beam.
