本文選題：加固 + 力學(xué)行為��； 參考：《西南交通大學(xué)學(xué)報(bào)》2017年05期

【摘要】：為探討膠黏劑粘彈性對(duì)碳纖維增強(qiáng)復(fù)合材料(CFRP)加固鋼筋混凝土(RC)梁力學(xué)行為的影響,以Burger模型表征膠黏劑的應(yīng)力-應(yīng)變-時(shí)間關(guān)系,利用Laplace變換和逆變換推導(dǎo)了Burger模型Prony級(jí)數(shù)形式的松弛剪切模量;采用ABAQUS對(duì)粘貼CFRP加固RC梁進(jìn)行數(shù)值模擬,分析了膠黏劑粘彈性對(duì)界面應(yīng)力、CFRP軸力、RC梁彎矩和加固梁撓度的影響.研究結(jié)果表明:膠黏劑的粘彈性對(duì)加固梁的力學(xué)行為有一定的影響,隨著持載時(shí)間的增加,界面峰值剪應(yīng)力和峰值正應(yīng)力均減小,CFRP軸力減小,RC梁彎矩增大,加固梁撓度增大;當(dāng)膠層厚度為0.2 mm時(shí),加載30 d后,界面峰值剪應(yīng)力減小了40.1%,界面峰值正應(yīng)力減小了33.0%,加固梁撓度增加了3.7‰,距離CFRP端部20 mm處截面上CFRP軸力減小了15.8%,RC梁彎矩增加了17.4%.
[Abstract]:In order to investigate the effect of viscoelasticity of adhesive on the mechanical behavior of reinforced concrete RC beams strengthened with CFRP, the stress-strain-time relationship of adhesives was characterized by Burger model. The relaxation shear modulus of Burger model Prony series is derived by using Laplace transform and inverse transformation, and the effect of adhesive viscoelasticity on the bending moment and deflection of RC beams strengthened with CFRP is analyzed by using ABAQUS. The results show that the viscoelasticity of the adhesive has a certain influence on the mechanical behavior of the strengthened beam. With the increase of the holding time, the peak shear stress and the peak normal stress of the interface decrease. The axial force of CFRP decreases and the bending moment of the RC beam increases, and the deflection of the strengthened beam increases. When the thickness of the adhesive layer is 0.2 mm, after 30 days of loading, the peak shear stress of the interface decreases by 40.1, the peak normal stress of the interface decreases by 33.0, the deflection of the strengthened beam increases by 3.7 鈥，

本文編號(hào)：1931754