本文關(guān)鍵詞：低預應力碳纖維布加固混凝土梁橋的關(guān)鍵技術(shù)研究　出處：《河北工業(yè)大學》2014年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 低預應力 碳纖維布 加固 靜載試驗

【摘要】：目前，碳纖維布加固方法憑借其優(yōu)點，受到了國內(nèi)眾多學者的青睞。普通碳纖維加固方法存在許多弊端且不能充分發(fā)揮碳纖維的高抗拉性能，因此眾多學者提出了預應力碳纖維布加固，此加固方法在橋梁領(lǐng)域的研究已經(jīng)取得部分成果，但由于張拉設備的限制，造成預應力碳纖維加固的實際應用性比較差，將預應力碳纖維加固應用到實際工程中的比較少。 本文遵循實用性和易操作性，在預應力碳纖維布加固的基礎(chǔ)上提出低預應力碳纖維加固方法。推導了低預應力加固方法的理論計算方法，并采用體外筋反拱法對12根矩形截面簡直梁進行了靜載試驗。研究了加載歷史、預應力水平對加固效果的影響，驗證了理論分析結(jié)果的正確性。通過靜載試驗研究得出了一下結(jié)論： 1)無應力CFRP布加固構(gòu)件未能提高構(gòu)件的極限承載能力，加載前期CFRP不發(fā)揮作用，，存在應力滯后現(xiàn)象。屈服荷載以后能抑制裂縫的發(fā)展，最終的破壞形式為剝離破壞； 2)本文低應力加固CFRP布初始應變達到75810-6加固效果最佳，預應力CFRP布加固極限承載力可提高44%~61%，提高了構(gòu)件的屈服荷載，有效的抑制了裂縫的開展。 3)低應力加固構(gòu)件的剛度有所提高，加載前期裂縫幾乎不發(fā)展，提高了構(gòu)件的開裂荷載，減小了撓度的增長速度。 4)低應力加固構(gòu)件的延性很接近原構(gòu)件，能保證加固構(gòu)件有很好的變形能力。 5)本試驗低應力加固構(gòu)件的CFRP初始應變達到55110-6時，構(gòu)件的破壞形式為CFRP被拉斷，屈服荷載以后無明顯破壞征兆，屬于脆性破壞。 6)驗證了低應力碳纖維布加固橋梁碳纖維布上所加預應力公式推導的正確性。
[Abstract]:At present, the carbon fiber cloth reinforcement method with its advantages, by many domestic scholars of all ages. There are many shortcomings and can not give full play to the high tensile properties of carbon fiber reinforcement method of carbon fiber, so many scholars put forward the prestressed CFRP reinforcement method, this research in the field of bridge has achieved some results, but because tension device limitations caused by application of prestressed carbon fiber reinforcement is relatively poor, the prestressed carbon fiber reinforcement applied to the actual project is relatively small.
This paper follows the practicability and maneuverability, the reinforcement method of low prestressed carbon fiber based on Prestressed CFRP reinforcement method is deduced. The low stress theoretical calculation method, and the in vitro anti rib arch method of 12 rectangular cross-section beam's static load experiment is carried out. On the loading history, prestress level on strengthening effect, verify the results of theoretical analysis. Through the static load test of draw the conclusion:
1) no stress CFRP cloth reinforcement component failed to improve the ultimate bearing capacity of the component. CFRP did not play a role in the early stage of loading. There was a stress hysteresis phenomenon. After yielding load, the development of cracks could be inhibited, and the final failure form was peeling failure.
2) in this paper, the initial strain of CFRP cloth strengthened with low stress reaches 75810-6, and the effect of reinforcement is the best. The ultimate bearing capacity of prestressed CFRP fabric can increase 44%~61%, increase the yield load of components, and effectively restrain the development of cracks.
3) the stiffness of the component with low stress is improved, and the crack is almost not developed at the early stage of loading. The cracking load of the component is improved and the growth rate of the deflection is reduced.
4) the ductility of the low stress reinforced component is very close to the original component, and it can guarantee the good deformation ability of the reinforced component.
5) in the test, when the initial strain of CFRP is 55110-6, the failure mode of the component is CFRP, which is broken. No obvious damage symptom is observed after yielding load. It belongs to brittle failure.
6) the correctness of the derivation of the prestress formula of the carbon fiber cloth reinforced bridge with low stress carbon fiber cloth was verified.

【學位授予單位】：河北工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U445.72

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本文編號：1375969