本文選題：FRP + 預(yù)應(yīng)力　； 參考：《浙江大學(xué)》2014年碩士論文

【摘要】：由于交通運輸日益繁忙、運輸車輛的噸位和軸重的增加,自然災(zāi)害的破壞、原設(shè)計標(biāo)準(zhǔn)偏低以及施工過程中存在的不足,許多服役橋梁正逐漸成為病橋、危橋,修補、補強橋梁結(jié)構(gòu)已成為土木工程領(lǐng)域的熱點問題。在不中斷交通的情況下,探索高效、簡捷、經(jīng)濟(jì)的加固技術(shù)成為研究人員的追求目標(biāo)。FRP作為一種高強的新型材料,在加固工程中具有巨大的應(yīng)用前景。特別是承受循環(huán)車輛荷載作用導(dǎo)致結(jié)構(gòu)性能劣化,影響結(jié)構(gòu)服役性和安全性的既有服役橋梁,FRP加固能有效提升結(jié)構(gòu)承載能力,在工程中得到廣泛應(yīng)用。由于在循環(huán)荷載作用下加固后結(jié)構(gòu)疲勞破壞往往先于承載力失效,FRP加固橋梁構(gòu)件的疲勞性能研究對結(jié)構(gòu)安全至關(guān)重要。然而,迄今為止國內(nèi)外對預(yù)應(yīng)力FRP加固技術(shù)研究相對較少,張拉錨固系統(tǒng)設(shè)計實施、預(yù)應(yīng)力損失監(jiān)測以及FRP和加固后疲勞性能評估等關(guān)鍵問題亟待詳細(xì)專門的研究,直接影響了預(yù)應(yīng)力FRP加固技術(shù)在實際工程中的應(yīng)用。 本文以實際工程為研究背景,設(shè)計研發(fā)工程適用的預(yù)應(yīng)力FRP張拉錨固系統(tǒng),通過理論分析驗證了該系統(tǒng)的安全性并開展了參數(shù)分析；探索運用光纖光柵傳感器監(jiān)測CFRP板的預(yù)應(yīng)力損失的精度和可行性；創(chuàng)新性地運用預(yù)應(yīng)力CFRP板組合CFRP布對背景工程進(jìn)行加固,通過數(shù)值模擬了解了加固構(gòu)件的力學(xué)性能,并與非預(yù)應(yīng)力加固方式進(jìn)行對比研究,探討預(yù)應(yīng)力度的合理取值范圍。為了明確FRP加固后結(jié)構(gòu)疲勞性能,本文根據(jù)大量的FRP抗彎加固鋼筋混凝土梁的疲勞試驗資料,建立了FRP加固梁式構(gòu)件的疲勞預(yù)測模型�，F(xiàn)將本文主要工作簡述如下： 1.運針對實際工程設(shè)計預(yù)應(yīng)力CFRP板加固混凝土橋梁結(jié)構(gòu)體系,通過解析及有限元分析確定預(yù)應(yīng)力水平對其加固效率的影響,并通過數(shù)值分析分析所設(shè)計張拉錨固系統(tǒng)的關(guān)鍵部位,以確保其結(jié)構(gòu)安全性及施工可行性。 2.運用光纖光柵傳感器(FBG)監(jiān)測CFRP板張拉過程以及長期的預(yù)應(yīng)力損失,監(jiān)測結(jié)果顯示,光纖光柵傳感器可以精準(zhǔn)的測量CFRP板的應(yīng)變,加固完成后,預(yù)應(yīng)力有一定程度的降低,最大預(yù)應(yīng)力損失值僅占設(shè)計值的4%,這說明基于FBG的監(jiān)測手段不僅能滿足橋梁加固過程中短期監(jiān)測需求,而且可對橋梁后續(xù)運營期的預(yù)應(yīng)力損失情況進(jìn)行長期監(jiān)測。 3.綜合了預(yù)應(yīng)力CFRP板加固技術(shù)和和非預(yù)應(yīng)力CFRP布加固技術(shù)的優(yōu)勢,運行預(yù)應(yīng)力CFRP板組合CFRP布對該橋進(jìn)行加固,運用數(shù)值分析方法分析了未加固、非預(yù)應(yīng)力CFRP板組合CFRP布加固和預(yù)應(yīng)力CFRP板組合CFRP布加固三種構(gòu)件的受力性能,并探討了合理的預(yù)應(yīng)力度取值范圍和承載力提升率的關(guān)系。 4.根據(jù)FRP抗彎加固鋼筋混凝土梁的疲勞試驗資料,建立了FRP加固梁式構(gòu)件疲勞壽命預(yù)測模型、鋼筋峰值應(yīng)變累積模型和撓度累積模型,并比較了模型與既有相關(guān)模型的預(yù)測精度。研究表明：以鋼筋應(yīng)變和撓度作為疲勞性能指標(biāo)不僅與傳統(tǒng)的應(yīng)力指標(biāo)具有相似的精度,可預(yù)測FRP加固構(gòu)件承受的循環(huán)荷載次數(shù),并可與結(jié)構(gòu)監(jiān)測系統(tǒng)信息結(jié)合,實現(xiàn)疲勞失效預(yù)警。
[Abstract]:With the increasing traffic of transportation , the tonnage and bearing weight of transportation vehicles , the damage of natural disasters , the low standard of original design and the shortage of the construction process , many service bridges are gradually becoming the hot spots in the field of civil engineering .

Based on the research background of practical engineering , the prestressed FRP tension anchorage system applied in R & D engineering is designed , and the safety of the system is verified by theoretical analysis and the parameter analysis is carried out .
The accuracy and feasibility of using fiber grating sensor to monitor the prestress loss of CFRP plate are explored .
In order to clarify the fatigue performance of FRP reinforced concrete beams , the fatigue prediction model of FRP strengthened beam members is established according to the fatigue test data of a large amount of FRP anti - bending reinforced concrete beams . The main work of this paper is as follows :

1 . In order to ensure the structural safety and the feasibility of construction , the concrete bridge structure system is reinforced by the prestressed CFRP plate with practical engineering design , the influence of the prestress level on the reinforcement efficiency is determined by the analysis and finite element analysis , and the key parts of the designed tension anchoring system are analyzed by numerical analysis .

2 . The fiber Bragg grating sensor ( FBG ) is used to monitor the tension process and the long - term prestress loss . The results show that the fiber grating sensor can accurately measure the strain of the CFRP plate . After the reinforcement is completed , the prestress is reduced to a certain extent . The maximum prestress loss value is only 4 % of the design value . This indicates that the FBG based monitoring means can not only meet the short - term monitoring demand in the reinforcement process of the bridge , but also can monitor the prestress loss of the subsequent operation period of the bridge .

3 . The reinforcement technology of prestressed CFRP sheets and the strengthening technology of non - prestressed CFRP sheets are combined . The prestressed CFRP sheets are used to reinforce the bridge , and the mechanical properties of three components reinforced by CFRP sheets combined with CFRP sheets and CFRP sheets are analyzed by numerical analysis , and the relationship between the reasonable prestress value range and the lifting rate of the bearing capacity is discussed .

4 . Based on the fatigue test data of FRP anti - bending reinforced concrete beam , the fatigue life prediction model , the peak strain accumulation model and the deflection accumulation model of FRP reinforcement beam are established , and the prediction accuracy of the model and the existing correlation model is compared . The results show that the strain and deflection of the steel bars are not only similar to the traditional stress index , but also can predict the number of cyclic load borne by the FRP reinforcement member , and can be combined with the information of the structural monitoring system to realize the fatigue failure warning .

【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441;U445.72

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