【摘要】：通過對CFRP施加不同的預(yù)應(yīng)力,分析在不同預(yù)應(yīng)力下CFRP增強結(jié)構(gòu)用集成材的抗彎性能。結(jié)果顯示:隨著預(yù)應(yīng)力的增大,CFRP增強結(jié)構(gòu)用集成材的抗彎性能得到顯著提高。在50%~66%預(yù)應(yīng)力施加范圍內(nèi),CFRP增強結(jié)構(gòu)用集成材較未增強結(jié)構(gòu)用集成材,極限荷載提高了15.8%~51.8%,抗彎強度提高了38.5%~81.7%,抗彎彈性模量提高了23.9%~70.5%。對CFRP施加預(yù)應(yīng)力使集成材木梁的彎曲破壞形式由脆性拉伸破壞轉(zhuǎn)變?yōu)檠有詨嚎s破壞,并且使集成材木梁跨中撓度過大的現(xiàn)象得到改善。同時也使集成材木梁的中性軸位置向下偏移,從而使木材的抗壓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.
【作者單位】： 北京林業(yè)大學(xué)材料科學(xué)與技術(shù)學(xué)院/木質(zhì)材料科學(xué)與應(yīng)用教育部重點實驗室;
【基金】：國家“十二五”863課題“國產(chǎn)碳纖維復(fù)合材料壓擠成型及其應(yīng)用技術(shù)研究”(2012AA03A204-01)
【分類號】：TB332

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