Abstract：In order to effectively improve the bearing capacity of ancient timber beams, a composite strengthening method of bonding fiber reinforced polymer in the tension zone and embedding steel bars in the compression zone was proposed. 11 rectangular timber beams were designed and tested, in which different strengthening methods, nominal reinforcement ratio in tension zone and different timber types were considered. The whole mechanical process and failure modes of all specimens were observed and recorded, the load-deflection and load-strain curves were obtained. The influence of various factors on the flexural behavior of the timber beams was analyzed. The test results indicate that the bearing capacity, stiffness and ductility of the strengthened timber beams only in the tension area are all improved with the increase of tension nominal reinforcement ratio, but the increase range is not significant. The bearing capacity and stiffness of timber beams strengthened with tension and compression zone are higher than those of the strengthened beams only in the tension area. The bearing capacity and stiffness of log beams can be significantly improved by composite strengthening in tension and compression zone, but the ductility is slightly reduced. Under the same condition, the bearing capacity and stiffness of the strengthened pine beams are better than those of the strengthened fir beams. During the loading process, the strain profiles of mid-span cross-section were nearly linear, and the strain of the wood and the strengthening material was basically same, indicating that the composite strengthening method can ensure the coordination between the wood and the strengthening material. The experimental results agree well with the theoretical values, which prove the correctness of the proposed model for the bearing capacity of timber beams strengthened in tension and compression zone.
周长东 杨礼赣 阿斯哈. 拉压区复合加固木梁抗弯性能试验研究[J]. 土木工程学报, 2020, 53(11): 55-63.
Zhou Changdong Yang Ligan A Shiha. Experimental study on flexural behavior of timber beams strengthened in #br#
both tension and compression zone. 土木工程学报, 2020, 53(11): 55-63.
