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对36根纤维增强复合材料(FRP)加固木梁的受弯性能进行研究。详细探讨受载后试件的工作机理和破坏模式。试件的设计参数为FRP的层数、FRP的类型及加固层的位置。分析各设计参数对加固木梁承载力和挠度的影响。试验结果表明,在木梁受拉区布置FRP可有效提高木梁的受弯承载力,受拉区粘贴一层CFRP可提高木梁受弯承载力30.61%。在纯弯区横向布置FRP可增强木梁受压区的性能,有效提高木梁的受弯承载力,提高的幅度与横向FRP层数有关。FRP加固木梁的破坏表现为受压区木纤维褶皱失稳、受拉区木纤维和FRP加固层被拉断。木梁受压区设置FRP加固层对受弯承载力的影响与加固的方式有关,受压区横向缠绕FRP加固效果最好,而沿梁纵向加固的效果并不明显。
The flexural properties of 36 beams strengthened with FRP were studied. After discussing in detail the working mechanism and failure mode of specimen after loading. The design parameters of the test piece are the number of FRP layers, the type of FRP and the position of the reinforcement layer. The influence of each design parameter on the bearing capacity and deflection of the reinforced timber beam is analyzed. The test results show that laying FRP in the tension zone of wooden beam can effectively increase the flexural bearing capacity of the wooden beam, and affixing a layer of CFRP in the tension zone can increase the bending bearing capacity of the beam by 30.61%. The transverse arrangement of FRP in the pure bending zone can enhance the performance of the compression zone of the wooden beam and effectively improve the flexural bearing capacity of the wooden beam, which is related to the horizontal FRP layers. The failure of FRP reinforced wood beams shows that the buckling of wood fibers in the compression zone is instability, and the tensile strength of FRP reinforcement layer in the tension zone is pulled off. The influence of FRP reinforcement layer on the flexural capacity in the compression zone of the wooden beam is related to the reinforcement method. The FRP reinforcement effect of the transverse compression in the compression zone is the best, while the reinforcement effect along the longitudinal beam is not obvious.