抄録
In this study, composite beams with timber and steel were tested and its strength was evaluated using superimposed strength and ultimate strength theory. Four types of specimens were as follows: (A) Timbers reinforced with lag screws(LS6) 50mm pitch, (B) timbers with steel plates (PL3.2) 3.2mm thickness put on top and bottom sides, and fasten with lag screws 50mm pitch, (C) timbers of (B) with cover woods on top and bottom sides, (D) no reinforced timbers. These specimens were experimented by three-point bending test. As the result of this experiment, it was found that 1)steel plates reinforced a timber beam effectively, 2)ultimate bending strength of B-series and C-series could be evaluated by superimposed and ultimate strength theory.
