本文選題：有黏結(jié)預(yù)應(yīng)力加固體系 + 連續(xù)箱梁橋��； 參考：《重慶交通大學(xué)》2015年碩士論文

【摘要】：隨著我國經(jīng)濟(jì)的不斷繁榮,交通量與日俱增,車輛載重也不斷提升,對橋梁的要求也越來越高。但根據(jù)相關(guān)統(tǒng)計(jì)資料顯示,全國的病危橋梁數(shù)量眾多,而重新修建這些橋梁顯然是不可能的,因此需要適當(dāng)?shù)募庸檀胧⿲ζ溥M(jìn)行維修,確保公路交通的順暢。預(yù)應(yīng)力混凝土連續(xù)梁橋是一種非常重要的橋梁形式,而這一類型橋梁的病害也是相當(dāng)嚴(yán)重的,故選擇合適的加固維修方式是也一項(xiàng)重要的研究內(nèi)容。文中從預(yù)應(yīng)力混凝土連續(xù)梁橋的常見損傷著手,分析了其主要病害的表現(xiàn)形式以及常用的加固方法,并分析了各種方法的利弊。有黏結(jié)預(yù)應(yīng)力加固體系是一種全新的結(jié)構(gòu)構(gòu)思,使用了新材料鍍鋅軟鋼絲束及HTCM高性能抗拉復(fù)合砂漿或AP多功能復(fù)合樹脂砂漿,并以其預(yù)應(yīng)力筋錨固工藝簡單、張拉施工方便、結(jié)構(gòu)耐久性高和加固效果明顯的綜合技術(shù)優(yōu)勢,受到國內(nèi)外土木工程界的重視。為了研究該加固技術(shù)在預(yù)應(yīng)力混凝土連續(xù)箱梁橋中的應(yīng)用,文中主要通過以下幾方面進(jìn)行展開。①介紹有黏結(jié)預(yù)應(yīng)力加固體系的基本理論,包括對該體系的具體使用闡述、體系常用的材料說明以及體系的基本加固原理,其中的加固原理主要是對受彎構(gòu)件的正截面、斜截面承載力的驗(yàn)算方法。②結(jié)合工程實(shí)例百丈大橋主橋的橋梁檢測報(bào)告,采用橋梁有限元專用軟件Midas Civil對其進(jìn)行仿真模擬,評估了該橋現(xiàn)階段的承載力狀態(tài),發(fā)現(xiàn)斜截面的抗剪承載能力不足,而且中跨距墩1/4L處區(qū)段的腹板位置主拉應(yīng)力大于規(guī)范要求,故需要對百丈大橋主橋進(jìn)行斜截面加固。③對多種加固方案進(jìn)行評選,最終選擇利用有黏結(jié)預(yù)應(yīng)力加固體系對百丈大橋主橋進(jìn)行斜截面加固,并通過Midas Civil進(jìn)行加固模擬。將得出的加固后分析結(jié)果與加固前模型對比,發(fā)現(xiàn)加固后的斜截面抗剪承載能力有了比較明顯的提升,不滿足規(guī)范要求的腹板位置主拉應(yīng)力也絕大部分滿足了加固目標(biāo),達(dá)到了加固補(bǔ)強(qiáng)的目的。除此之外,還對體系中可能影響加固效果的因素分別進(jìn)行了討論,如選用的高性能抗拉復(fù)合砂漿類型、腹板尺寸的改變大小等。通過以上幾方面有黏結(jié)預(yù)應(yīng)力加固體系在預(yù)應(yīng)力混凝土連續(xù)箱梁橋中的應(yīng)用研究,望對相同類型橋梁應(yīng)用該體系的加固提供一定的指導(dǎo)參考。
[Abstract]:With the economic prosperity of our country, traffic volume is increasing day by day, the vehicle load is also increasing, and the requirement of bridge is becoming higher and higher. However, according to the relevant statistics, there are a large number of critical bridges in China, and it is obviously impossible to rebuild these bridges. Therefore, appropriate reinforcement measures are needed to maintain them to ensure smooth road traffic. Prestressed concrete continuous beam bridge is a very important bridge form, and the disease of this type of bridge is quite serious, so it is also an important research content to choose the appropriate reinforcement and maintenance method. Starting from the common damage of prestressed concrete continuous beam bridge, this paper analyzes the main disease forms and common reinforcement methods, and analyzes the advantages and disadvantages of various methods. The reinforced system with bonded prestressing force is a new kind of structure conception. The new material galvanized mild steel wire bundle and HTCM high performance tensile composite mortar or AP multifunctional composite resin mortar are used. The anchoring technology of prestressing tendons is simple and the tension construction is convenient. The comprehensive technical advantages of high durability and obvious reinforcement effect have been attached great importance to by the civil engineering circles at home and abroad. In order to study the application of this reinforcement technology in prestressed concrete continuous box girder bridge, this paper mainly introduces the basic theory of bonded prestressed reinforcement system by following aspects, including the concrete application of the system. The common material description of the system and the basic reinforcement principle of the system, in which the reinforcement principle is mainly the checking calculation method of the normal section and the bearing capacity of the inclined section of the flexural member. 2. Combined with the bridge inspection report of the main bridge of the Baizhang Bridge in the engineering example, The finite element software Midas Civil is used to simulate the bridge, and the bearing capacity of the bridge is evaluated at the present stage. It is found that the shear bearing capacity of the inclined section is insufficient. Moreover, the main tensile stress of the web in the 1 / 4L section of the mid-span pier is greater than that required by the code, so it is necessary to select various reinforcement schemes for the main bridge of Baizhang Bridge by strengthening it with oblique section. Finally, the reinforced main bridge of Baizhang Bridge is reinforced with bonded prestressed reinforcement system, and the reinforcement simulation is carried out by Midas Civil. By comparing the results obtained with the model before reinforcement, it is found that the shear bearing capacity of the reinforced oblique section has been obviously enhanced, and the main tensile stress of the web position which does not meet the requirements of the code is mostly satisfied with the reinforcement goal. The purpose of strengthening and strengthening has been achieved. In addition, the factors which may affect the reinforcement effect are discussed, such as the type of high performance tensile composite mortar, the change of web size and so on. Through the research on the application of bonded prestressed reinforcement system in prestressed concrete continuous box girder bridge, this paper hopes to provide some guidance for the reinforcement of the same type of bridge.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U445.72

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本文編號(hào)：1897828