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提供了15根FRP环向加固木柱的轴心抗压性能试验数据,详细探讨了受载后试件的工作机理和破坏模式,试件的设计参数为FRP的层数和FRP的类型,分析了各设计参数对加固木柱承载力和峰值应变的影响。试验结果表明,FRP环向加固木柱可提高木柱的抗压承载力,改善木柱的延性。在极限荷载以前,加固木柱的荷载-应变关系曲线基本保持线性变化,在极限荷载以后曲线为近似理想塑性。加固木柱的承载力和峰值应变随加固层数的增加而增加。3层GFRP可提高木柱承载力和峰值应变分别达21.82%和94.95%。试件的极限荷载和轴向应变随环向FRP的弹性模量的增加而增加,但增幅逐渐变缓。加固木柱达到极限荷载时,环向加固层没有出现拉断现象,其环向应变并未达到环向加固层的极限应变,仅为FRP极限拉应变的10%左右。木柱的破坏始于木纤维的弯曲变形,环向FRP可有效约束这种变形的发展,这是改善木柱轴心受压性能的主要原因。所有试件的破坏模式都表现为木柱产生错动变形,被完全压皱破坏。
The experimental data of the axial compressive properties of 15 FRP hoop columns were provided. The working mechanism and failure modes of the specimens after loading were discussed in detail. The design parameters of the specimens were the number of FRP layers and the type of FRP. The effect of each design parameter on the bearing capacity and peak strain of the reinforced timber column was studied. The test results show that the FRP hoop reinforced wood column can improve the compressive bearing capacity of wood columns and improve the ductility of wood columns. Before the ultimate load, the load-strain curve of the reinforced wood column keeps a linear change basically, and the curve is approximately ideal plastic after the ultimate load. The bearing capacity and peak strain of reinforced timber columns increase with the number of reinforcement layers. The three-layer GFRP can increase the wood column bearing capacity and peak strain of 21.82% and 94.95% respectively. The ultimate load and axial strain of the specimen increase with the increase of the elastic modulus of the toroidal FRP, but the increase gradually becomes slower. Reinforcement wood column to reach the ultimate load, the ring reinforcement layer does not appear pulled off phenomenon, the hoop strain does not reach the ultimate strain of the circumferential reinforcement, FRP ultimate tensile strain of only about 10%. The failure of the wood column begins with the bending deformation of the wood fiber, and the circumferential FRP can effectively constrain the development of this deformation, which is the main reason for improving the axial compression performance of the wood column. The failure mode of all the specimens showed that the wood column had the wrong deformation and was completely crushed and damaged.