2 Master of the Department of Civil Engineering, NTUT, Taipei, Taiwan. The Study on Wood Beam of Historical Building Reinforced by Using Glass Fiber Reinforced Plastic Bar Yeou-Fong Li1 and Ting-Fang Wei2 1Professor of the Department of Civil Engineering , NTUT, Taipei, Taiwan . 2 Master of the Department of Civil Engineering, NTUT, Taipei, Taiwan. Abstract : Hollow-sectioned wood beam which was pre-stressed by glass fiber reinforced polymer (GFRP) bar working method was proposed in the thesis. The four-point bending test was conducted to obtain the load-displacement relationships of seventeen timber beams. A total of six group specimens were tested, those groups are benchmark, control, wood power with epoxy, GFRP bar at the central and eccentric of the timber section, and GFRP rebar with CFRP sheet. A sectional analysis method was used to obtain the force-displacement relationships of these wood beams. It shows that the analytical results can reasonably predict the force-displacement relationships of these wood beams strenthened by GFRP bar or CFRP sheet. Keywords： Wood Historical Building, Wood Beam, GFRP Bar The four-point bending tests of a wood beam specimen were performed in NTUT Martial Lab. Comparing the GFRP Group experimental result with the Control Group. C G The procedure of wood beams can be restored. The force-displacement relationships of GFRP Group were used the sectional analysis method. Preparation The properties of wood beams were determined A select group of reinforced type GFRP bar CFRP sheet Wood power with epoxy Conclusions Comparing the experimental results with the Control Group, the average strengths of the Wood-Epoxy, GFRP, GFRP-e and G-CFRP increase 0.6%, 4.3%, 3.5%, and9.5%, separately.