不同预应力CFRP增强结构用集成材抗弯性能研究
发布时间:2018-09-03 12:24
【摘要】:通过对CFRP施加不同的预应力,分析在不同预应力下CFRP增强结构用集成材的抗弯性能。结果显示:随着预应力的增大,CFRP增强结构用集成材的抗弯性能得到显著提高。在50%~66%预应力施加范围内,CFRP增强结构用集成材较未增强结构用集成材,极限荷载提高了15.8%~51.8%,抗弯强度提高了38.5%~81.7%,抗弯弹性模量提高了23.9%~70.5%。对CFRP施加预应力使集成材木梁的弯曲破坏形式由脆性拉伸破坏转变为延性压缩破坏,并且使集成材木梁跨中挠度过大的现象得到改善。同时也使集成材木梁的中性轴位置向下偏移,从而使木材的抗压能力得到了充分利用。
[Abstract]:By applying different prestressing forces to CFRP, the flexural properties of agglomerated timber for CFRP reinforced structures under different prestress conditions are analyzed. The results show that with the increase of prestress, the flexural properties of the composite timber reinforced with CFRP are improved significantly. In the range of 50% and 66% prestress applied to CFRP reinforced structures, the composite timber used for CFRP reinforced structures is higher than that for unreinforced structures, the ultimate load has been increased by 15.81.80 and the flexural strength has been increased by 38.5% and 81.7%, and the flexural modulus of elasticity has increased by 23.9% and 70.5%. Applying prestress to CFRP can change the bending failure form from brittle tensile failure to ductile compression failure and improve the phenomenon of excessive deflection in the span of the timber beam. At the same time, the neutral axis position of the timber beam is shifted downwards, so that the compressive ability of the timber is fully utilized.
【作者单位】: 北京林业大学材料科学与技术学院/木质材料科学与应用教育部重点实验室;
【基金】:国家“十二五”863课题“国产碳纤维复合材料压挤成型及其应用技术研究”(2012AA03A204-01)
【分类号】:TB332
本文编号:2219973
[Abstract]:By applying different prestressing forces to CFRP, the flexural properties of agglomerated timber for CFRP reinforced structures under different prestress conditions are analyzed. The results show that with the increase of prestress, the flexural properties of the composite timber reinforced with CFRP are improved significantly. In the range of 50% and 66% prestress applied to CFRP reinforced structures, the composite timber used for CFRP reinforced structures is higher than that for unreinforced structures, the ultimate load has been increased by 15.81.80 and the flexural strength has been increased by 38.5% and 81.7%, and the flexural modulus of elasticity has increased by 23.9% and 70.5%. Applying prestress to CFRP can change the bending failure form from brittle tensile failure to ductile compression failure and improve the phenomenon of excessive deflection in the span of the timber beam. At the same time, the neutral axis position of the timber beam is shifted downwards, so that the compressive ability of the timber is fully utilized.
【作者单位】: 北京林业大学材料科学与技术学院/木质材料科学与应用教育部重点实验室;
【基金】:国家“十二五”863课题“国产碳纤维复合材料压挤成型及其应用技术研究”(2012AA03A204-01)
【分类号】:TB332
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1 张建云;邹晋;周贤良;华小珍;;SiC_p/Al复合材料抗弯性能研究[J];功能材料;2008年04期
,本文编号:2219973
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