本文選題：鋼-混組合梁 + 負彎矩區(qū)　； 參考：《重慶交通大學(xué)》2015年碩士論文

【摘要】：鋼-混組合連續(xù)梁橋在中間支座處有較大的負彎矩,混凝土橋面板因承受較大的拉應(yīng)力,易出現(xiàn)開裂問題�；炷涟逡蜷_裂退出工作,使組合梁的剛度減小,組合效應(yīng)減弱。倘若裂縫較大,有害物質(zhì)會通過裂縫滲入到混凝土中,嚴(yán)重腐蝕、銹蝕鋼筋,降低組合梁的耐久性,增加維護養(yǎng)護工作的困難。因此,在負彎矩作用下,對于研究連續(xù)混凝土板裂縫的發(fā)展、分布規(guī)律、控制方法和連續(xù)組合梁的承載能力、滑移效應(yīng)是非常有必要的。本文依托港珠澳大橋淺水區(qū)非通航孔橋為工程背景,對鋼-混組合梁負彎矩區(qū)的抗阻裂的方法進行了研究:①介紹了鋼-混凝土組合梁的發(fā)展概況、國內(nèi)外對結(jié)構(gòu)裂紋的研究現(xiàn)狀。論述了微膨脹纖維混凝土、支點強迫位移法和張拉預(yù)應(yīng)力鋼束這三種阻裂方法,以港珠澳大橋為項目背景詳細介紹了組合梁體系轉(zhuǎn)換施工流程、頂落梁施工、橋面板組合等,著重闡述了頂落梁與張拉預(yù)應(yīng)力的施工工藝、注意事項等。對體系轉(zhuǎn)換做了整體的概括。②對頂升過程進行了有限元理論計算,對實測數(shù)據(jù)與有限元理論計算結(jié)果進行對比分析,對同步頂升施工過程起到了有效的控制作用。根據(jù)結(jié)構(gòu)電算、實測數(shù)據(jù)分析得到頂落梁與張拉預(yù)應(yīng)力兩種阻裂方法的阻裂效果。③本文主要測試了港珠澳大橋鋼主梁組合階段到存梁階段(四點支撐到兩點支撐)、頂升回落階段(體系轉(zhuǎn)換階段)兩個工況的相對滑移。通過百分表測得了鋼梁與混凝土翼緣板界面的滑移規(guī)律,通過振弦式傳感器與應(yīng)變片測得了應(yīng)變規(guī)律。④通過體系轉(zhuǎn)換階段的橋面板撓度、應(yīng)力、鋼混相對滑移來進行分析并有效控制,并引出本文的創(chuàng)新點—含F(xiàn)RP阻裂增強層的混凝土結(jié)構(gòu)。本文基于斷裂力學(xué)原理,分析了FRP阻裂增強層的兩條斷裂力學(xué)機理,并得出FRP阻裂增強層的優(yōu)勢。實驗室分別對粘貼FRP阻裂增強層試件素混凝土試件進行抗彎強度和受力性能的測定與對比分析,證明了FRP阻裂增強層具有較高的承載能力,含F(xiàn)RP阻裂增強層的小梁較素混凝土小梁的開裂荷載和極限承載能力都得到了極大程度的提高。
[Abstract]:The steel-concrete composite continuous beam bridge has a large negative bending moment at the middle support, and the concrete deck slab is prone to crack due to the large tensile stress. The stiffness of the composite beam is reduced and the combination effect is weakened due to the cracking of concrete slab. If the crack is large, the harmful material will seep into the concrete through the crack, corrode the steel bar seriously, reduce the durability of the composite beam and increase the difficulty of maintenance and maintenance. Therefore, it is necessary to study the development, distribution, control method and bearing capacity of continuous concrete slab under negative bending moment. In this paper, based on the engineering background of non-navigable bridge in shallow water area of Hong Kong-Zhuhai-Macao Bridge, the anti-crack resistance method of steel-concrete composite beam in negative moment region is studied. The development of steel-concrete composite beam is introduced at 1: 1. Research status of structural cracks at home and abroad. This paper discusses three kinds of crack resistance methods, such as micro-expansive fiber concrete, fulcrum forced displacement method and tensioning prestressed steel bundle. Taking the Hongzhou-Zhuhai-Macao Bridge as the project background, this paper introduces in detail the construction process of the system conversion of composite beam, the construction of roof and falling beam, the combination of deck and slab, etc. The construction technology and matters needing attention of jacking and falling beam and tensioning prestress are expounded emphatically. The transformation of the system is summarized as a whole. 2 the finite element theory calculation of the lifting process is carried out, and the comparison between the measured data and the calculated results of the finite element theory is carried out, which plays an effective role in controlling the construction process of the synchronous uplift. According to the structure calculation, In this paper, we mainly test the combination stage of steel main girder of Hongzhou-Zhuhai-Macao Bridge and the stage of saving beam (from four point support to two points support, rising down stage). 3. The result of the analysis of measured data shows that the crack resistance effect of two kinds of crack resistance methods of top fall beam and tensioning prestressing force is obtained in this paper. Relative slippage of two working conditions in the stage (system transition stage). The slip law of the interface between steel beam and concrete flange slab is measured by a percentile meter, and the strain law is measured by vibrating string sensor and strain gauge. The relative slip of steel concrete is analyzed and effectively controlled, and the innovative point of this paper is the concrete structure with FRP crack resistance and strengthening layer. Based on the principle of fracture mechanics, this paper analyzes the two fracture mechanics mechanisms of FRP anti-crack enhancement layer, and obtains the advantages of FRP anti-crack strengthening layer. The flexural strength and mechanical properties of the plain concrete specimens bonded with FRP crack resistant reinforcement layer were measured and compared in the laboratory, which proved that the FRP anti-crack strengthening layer has a higher bearing capacity. Compared with plain concrete trabeculae, the cracking load and ultimate bearing capacity of trabeculae with FRP anti-crack enhancement layer have been greatly improved.
【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】：U445.4

【參考文獻】

相關(guān)期刊論文 前4條

1 曾憲桃,車惠民;復(fù)合材料FRP在橋梁工程中的應(yīng)用及其前景[J];橋梁建設(shè);2000年02期

2 閻石，朱聘儒;壓型鋼板組合梁栓釘連接實驗研究[J];沈陽建筑工程學(xué)院學(xué)報;1995年02期

3 閻石，劉學(xué)東;鋼─混凝土組合梁連接件的綜合評述[J];沈陽建筑工程學(xué)院學(xué)報;1996年02期

4 吳守亮;鋼—混凝土組合梁在我國的發(fā)展與研究[J];西部探礦工程;2002年S1期

相關(guān)碩士學(xué)位論文 前1條

1 李穎;鋼筋混凝土受彎構(gòu)件裂紋發(fā)展規(guī)律研究[D];重慶交通大學(xué);2009年

，

本文編號：1792404