本文選題：板橋 + 病害成因��； 參考：《重慶交通大學(xué)》2015年碩士論文

【摘要】：板橋是中小跨徑橋梁中常用的橋型之一,其施工工藝簡單、建筑高度較小,曾一度被大量建造。而近年來的工程實踐和檢測結(jié)果表明,板橋已經(jīng)呈現(xiàn)出越來越多的病害,對于出現(xiàn)的病害一方而需要從設(shè)計理念和施工角度查找原因,一方面需要及時采取加固措施予以補(bǔ)救。本文系統(tǒng)地總結(jié)了橋梁加固技術(shù)的研究現(xiàn)狀,鋼筋混凝土及預(yù)應(yīng)力混凝土板橋病害成因、各種加固技術(shù)和相應(yīng)的計算理論,在計算理論方面重點(diǎn)闡述了橋梁加固分階段受力與帶載加固的特點(diǎn)。本文提出了分清加固性質(zhì)、明確加固目的、注意多種加固技術(shù)綜合利用的橋梁改造加固設(shè)計原則,對預(yù)應(yīng)力加固體系做了較為詳細(xì)的介紹,最后以一座鋼筋混凝土空心板橋和兩座預(yù)應(yīng)力混凝土空心板橋為例,對有粘結(jié)預(yù)應(yīng)力加固方法和粘貼鋼板加固方法的流程和常見問題做出了一定的分析。通過總結(jié)分析,對于空心板橋的加固方案選擇給出以下建議：(1)對于原橋空心板底面出現(xiàn)嚴(yán)重橫向裂縫,抗彎承載力不足,且混凝土碳化較嚴(yán)重的情況,宜優(yōu)先采用有黏結(jié)預(yù)應(yīng)力加固方案。采用錨固于被加固梁體上的小直徑預(yù)應(yīng)力筋,對梁體施加預(yù)應(yīng)力,然后噴注高性能復(fù)合砂漿的有粘結(jié)預(yù)應(yīng)力加固方案,對空心板橋進(jìn)行正截面加固,可以較大幅度提高板的正截面抗彎承載力。后噴注的復(fù)合砂漿層可以保護(hù)鋼筋免于銹蝕,提高結(jié)構(gòu)的耐久性,達(dá)到承載力加固和耐久性加固的雙重目的。此外,由于后噴注的復(fù)合砂漿層加大了原梁截面尺寸,增加了截面剛度,對解決變形過大問題也有所幫助。(2)對原橋面破損嚴(yán)重的情況,應(yīng)結(jié)合橋面鋪裝改造維修,首先考慮采用加大截面法對空心板的受壓區(qū)進(jìn)行加固(加厚橋面板)。結(jié)合橋面鋪裝改造維修,適當(dāng)加大橋面鋪裝層厚度,考慮新加厚的橋面鋪裝參與空心板共同工作,使梁的有效高度增加,可以提高梁的抗彎承載力。(3)空心板梁結(jié)構(gòu)的梁高較小,原梁的配筋率相對較大,由于受原梁變形的限制,極限狀態(tài)下后加補(bǔ)強(qiáng)材料更難以發(fā)揮作用,后加補(bǔ)強(qiáng)材料應(yīng)變(應(yīng)力)滯后所帶來的各種不利影響將更加突出。因此,直接粘貼鋼板或高強(qiáng)纖維復(fù)合材料對空心板梁進(jìn)行加固是不適宜的。
[Abstract]:Plate bridge is one of the commonly used bridge types in medium and small span bridges. Its construction technology is simple and the building height is small. The engineering practice and test results in recent years show that more and more defects have appeared in the plate bridge. The cause of the disease should be found from the point of view of design concept and construction. On the one hand, it is necessary to take timely reinforcement measures to remedy it. This paper systematically summarizes the research status of bridge reinforcement technology, the causes of disease of reinforced concrete and prestressed concrete slab bridge, various reinforcement techniques and corresponding calculation theory. In the aspect of calculation theory, the paper expounds the characteristics of bridge reinforcement by stages and with loads. In this paper, the design principles of bridge reconstruction and reinforcement, which distinguish the nature of reinforcement, clear the purpose of reinforcement, pay attention to the comprehensive utilization of various reinforcement technologies, are put forward, and the prestressed reinforcement system is introduced in detail. Finally, taking a reinforced concrete hollow slab bridge and two prestressed concrete hollow slab bridges as examples, the flow and common problems of bonded prestressed reinforcement method and bonded steel plate reinforcement method are analyzed. Through summing up and analyzing, the following suggestions are given for the selection of reinforcement scheme of hollow slab bridge: (1) for the serious transverse cracks on the bottom surface of hollow slab of the original bridge, the flexural bearing capacity is insufficient, and the concrete carbonization is serious. Priority should be given to the use of bonded prestressed reinforcement scheme. The small diameter prestressed tendons which are anchored on the strengthened beams are used to apply prestress to the beam body, and then the bonded prestressed reinforcement scheme of high performance composite mortar is sprayed to reinforce the hollow slab bridge with normal section. The flexural bearing capacity of the normal section of the plate can be greatly improved. The composite mortar layer can protect the steel bar from corrosion, improve the durability of the structure, and achieve the dual purpose of bearing capacity strengthening and durability strengthening. In addition, the composite mortar layer after injection increases the cross-section size of the original beam, increases the stiffness of the section, and helps to solve the problem of excessive deformation. (2) for the serious damage of the original bridge deck, it should be combined with the bridge deck pavement reconstruction and maintenance. Firstly, the method of increasing section is used to strengthen the compressed area of hollow slabs (thickened deck slab). Combined with bridge deck pavement modification and maintenance, the thickness of deck pavement is increased appropriately, and the new thickened deck pavement is considered to participate in the joint work of hollow slab, so that the effective height of beam can be increased, and the flexural bearing capacity of beam can be improved. (3) the beam height of hollow slab beam structure is smaller, The reinforcement ratio of the original beam is relatively large. Due to the limitation of the deformation of the original beam, it is more difficult to exert the function of the post-reinforcement material under the limit state, and all kinds of adverse effects caused by the strain (stress) lag of the post-reinforcement material will be more prominent. Therefore, it is not appropriate to reinforce hollow slab beam with steel plate or high-strength fiber composite directly.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U445.72

【共引文獻(xiàn)】

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相關(guān)碩士學(xué)位論文 前3條

1 王希財;橋梁單樁缺陷與承載力的加固研究[D];長安大學(xué);2013年

2 武尚偉;大跨徑波紋鋼腹板組合梁橋撓度分析[D];長安大學(xué);2014年

3 程輝;火災(zāi)后空心板梁橋承載力評定及加固對策研究[D];長安大學(xué);2014年

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本文編號：2057949