预应力FRP增强竹木集成材抗弯性能的初步研究

摘要

According tobending experiments of wood-bamboo structuralglulam reinforced by prestressed FRP, the influence of prestressed FRP on bending strength, elastic modulus and the neutral axis was studied. The experimental results are as follows: bending strength, elastic modulus and the shift of neutral axis of wood-bamboo structuralglulam reinforced by prestressed FRP with 30% of ultimate tensile strength(UTS) are most. In addition,they are respectively 73.05MPa, 7312.80MPa, 1.73mm compared with gulam with no prestressing. What’s more, after thefirst destruction, the load of wood-bamboo structuralglulam reinforced by prestressed FRP with 30% ,40% of UTS respectively declines11%,18% instead of 46.80% of glulam with no prestressing.%通过对预应力FRP增强竹木集成材的抗弯实验，研究了不同预应力FRP对集成材抗弯强度、弹性模量及中性轴的影响，实验结果表明：在预应力FRP增强竹木集成材中，30%UTS预应力FRP增强竹木集成材的抗弯强度、弹性模量及中性轴偏移最大，抗弯强度达到73.05MPa，弹性模量7312.80 MPa，相对于无预应力FRP增强的竹木集成材中性轴向下偏移1.73 mm。并且集成材在一次破坏后，30%UTS、40%UTS预应力FRP增强竹木集成材承受荷载仅分别下降11%,18%,而无预应力FRP增强竹木集成材则急剧下降46.80%。