- 摘 要
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（1 南京林業(yè)大學(xué)土木工程學(xué)院， 南京 210037； 2 東北大學(xué)后勤服務(wù)總公司， 沈陽 110004）
［摘要］針對竹結(jié)構(gòu)受彎構(gòu)件截面剛度低、承載力與跨越能力不足等應(yīng)用局限，提出預(yù)應(yīng)力FRP筋增強(qiáng)竹梁的方法，給出了其關(guān)鍵制造工藝。制作了4個預(yù)應(yīng)力FRP筋增強(qiáng)竹梁和1個對比竹梁，研究參數(shù)包括FRP筋直徑和預(yù)應(yīng)力大小。結(jié)果表明，預(yù)應(yīng)力FRP筋增強(qiáng)竹梁破壞始于梁底邊緣竹材纖維受拉斷裂，預(yù)應(yīng)力的施加能夠使竹材的抗壓強(qiáng)度利用得更加充分，破壞時的延性特征更為明顯，預(yù)應(yīng)力FRP筋增強(qiáng)竹梁對應(yīng)各個相關(guān)規(guī)范撓度限值時的荷載值都得到了較大提高，預(yù)應(yīng)力的施加使得構(gòu)件截面剛度得到了有效的提高，其提高幅度隨著施加預(yù)應(yīng)力的增大而增大。采用復(fù)合梁理論對預(yù)應(yīng)力FRP筋增強(qiáng)竹梁試件的截面剛度進(jìn)行預(yù)測，結(jié)果表明截面剛度預(yù)測結(jié)果與試驗(yàn)結(jié)果吻合很好。
［關(guān)鍵詞］竹結(jié)構(gòu)； 預(yù)應(yīng)力； FRP筋； 力學(xué)性能
中圖分類號：TU366-1文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2018)10-0108-06
Experimental study on mechanical properties of bamboo beam reinforced with prestressed FRP bars
Cheng Xunyu1, Wei Yang1, Xu Yang1, Li Guofen1， Wang Xuefeng2
(1 College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China;2 Northeast University Logistics Service Corporation, Shenyang 110004, China)
Abstract:Aiming at the application limitations of bamboo flexural members such as low stiffness, insufficient bearing capacity and insufficient span capacity, it was proposed to use prestressed FRP bars to strengthen bamboo beams and its key manufacturing process was given. Four bamboo beams strengthened with prestressed FRP bars and one control bamboo beam were manufactured. The parameters studied included the diameter of the FRP bars and the value of the prestress force. The results show that the failure of the bamboo beams strengthened with prestressed FRP bars occurs by the tensile rupturing of the bamboo fiber at beam bottom. The occurrence of the prestressed force can make the compressive strength of the bamboo to be more fully utilized and the ductility characteristics at failure become more obvious. The load values of the strengthened bamboo beam are greatly increased when they reach the deflection limits prescribed by relevant standards. The prestress force makes the sectional stiffness of the flexural members effectively increase, and the increase in amplitude increases with the increase of prestressing force. The composite beam theory was used to predict the sectional stiffness of the bamboo beams strengthened with prestressed FRP bars. The results show that the predicted sectional stiffnesses are in good agreement with the experimental results.
Keywords:bamboo structure; prestress; FRP bar; mechanical property
*國家自然科學(xué)基金項(xiàng)目（51208262，51778300），江蘇省自然科學(xué)基金項(xiàng)目（BK20151520），江蘇省“333”工程（BRA2016421）和“青藍(lán)工程”項(xiàng)目（QL2017），江蘇高校優(yōu)勢學(xué)科建設(shè)工程資助項(xiàng)目（PAPD），江蘇省研究生科研與實(shí)踐創(chuàng)新計(jì)劃項(xiàng)目（KYCX17-0830）。
通訊作者：魏洋，博士，教授，博士生導(dǎo)師，Email:wy78@njfu.edu.cn。
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