本文選題：鋼筋砼拱橋 + 勁性骨架�。� 參考：《重慶交通大學》2015年碩士論文

【摘要】：當前,國內大跨度鋼筋混凝土拱橋多采用懸臂拼裝法或懸臂澆筑法施工,懸臂拼裝施工法降低了對纜索吊裝系統(tǒng)的要求,但施工完成的拱圈接頭多、整體性差、易開裂、耐久性差。懸臂澆筑法施工的拱圈雖整體性好,但因懸臂段較長,線形難于控制,施工風險大,且對扣錨系統(tǒng)有較高要求。日本采用懸臂澆筑與勁性骨架組合施工法修建了多座大跨度鋼筋混凝土拱橋,施工完成的主拱圈整體性好、線形易于控制、降低了對纜索吊裝系統(tǒng)的要求,較全勁性骨架法可節(jié)省用鋼量。本文依托工程采用懸臂澆筑與勁性骨架組合法施工(即從拱腳向拱頂方向采用掛籃懸臂澆筑,到達一定位置后,安裝勁性骨架合龍成拱,再澆筑外包混凝土,形成鋼筋混凝土拱圈)。采用組合法施工的鋼筋混凝土拱橋,勁性骨架位于拱頂區(qū)段,且只能在有限的拱圈混凝土內錨固,在外包混凝土澆筑過程中接頭混凝土與勁性骨架受力較全勁性骨架混凝土拱橋更為不利,是大橋設計的關鍵。為此,本文以依托工程為研究對象,開展鋼筋混凝土拱圈與勁性骨架接頭構造力學行為研究。本文主要研究內容如下:①依照依托工程施工設計圖及施工流程圖,開展了主拱圈施工階段仿真分析。②依據(jù)主拱圈施工階段仿真分析結果。進行了基于勁性骨架施工過程穩(wěn)定性及基于接頭抗剪力學性能的勁性骨架腹桿構造優(yōu)化。③查閱了國內外有關型鋼混凝土粘結滑移本構關系理論研究的成果,進行了依托工程混凝土拱圈與勁性骨架(型鋼)接頭的受力行為理論分析。④采用有限元軟件ANSYS建立了考慮型鋼混凝土粘結滑移的精細化接頭實體模型,依據(jù)精細化接頭實體模型計算結果,進行了接頭型鋼混凝土界面相對滑移長度分析、外包混凝土應力分布規(guī)律分析。驗證了型鋼預埋長度理論分析結果,提出了接頭構造設計建議。⑤設計制作了接頭軸向壓力及剪力局部足尺試驗模型,開展了接頭在軸向壓力及剪力作用下的實驗研究,將接頭試驗結果與考慮型鋼混凝土粘結滑移的精細化有限元模型計算結果進行了對比分析。
[Abstract]:At present, the cantilever assembly method or cantilever pouring method is used to construct the long-span reinforced concrete arch bridge in our country. The cantilever assembly construction method reduces the requirement for cable hoisting system, but the arch ring joints completed in the construction are many, the integrity is poor, and the cracking is easy. Poor durability. The arch ring constructed by cantilever casting method has good integrity, but because of the long cantilever section, the linear shape is difficult to control, the construction risk is high, and there is a high requirement for the anchoring system. In Japan, many long-span reinforced concrete arch bridges were constructed by the combination of cantilever pouring and rigid frame construction. The main arch ring completed in Japan has good integrity, linear shape is easy to control, and the requirements for cable hoisting system are reduced. Compared with the full stiffness skeleton method, the amount of steel used can be saved. In this paper, the cantilever pouring and stiffening skeleton combination method are used in the project (that is, the hanging basket cantilever is used in the direction from the arch foot to the arch top. After reaching a certain position, the rigid skeleton is installed to close the arch to form a arch, and then the concrete is poured out. Form reinforced concrete arch ring. In the reinforced concrete arch bridge constructed by combination method, the rigid skeleton is located in the section of the arch roof and can only be anchored in the limited arch ring concrete. The joint concrete and the stiffness skeleton are more unfavorable than the fully rigid concrete arch bridge during the pouring process of the outer concrete, which is the key to the design of the bridge. Therefore, the structural mechanical behavior of reinforced concrete arch ring and stiffened skeleton joint is studied in this paper. The main contents of this paper are as follows: 1. According to the construction design drawing and construction flow chart, the main arch ring construction stage simulation analysis .2 according to the main arch ring construction stage simulation analysis results. Based on the stability of the rigid frame construction process and the shear mechanical properties of the joints, the structural optimization of the rigid skeleton web members is carried out. 3. The results of the theoretical research on the bond-slip constitutive relationship of steel reinforced concrete at home and abroad are reviewed. In this paper, the mechanical behavior of concrete arch ring and stiffened frame (section steel) joint is analyzed theoretically. 4. The solid model of fine joint considering bond slip of steel reinforced concrete is established by using finite element software ANSYS. Based on the calculation results of refined joint solid model, the relative slip length of SRC interface is analyzed, and the stress distribution law of concrete is analyzed. The theoretical analysis results of the embedded length of section steel are verified, and the design suggestion of joint structure 5 is put forward. The local full-scale test model of joint axial pressure and shear force is made, and the experimental study of joint under axial pressure and shear force is carried out. The test results of joints are compared with the calculated results of fine finite element model considering bond-slip of steel reinforced concrete (SRC).
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U441;U448.22

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本文編號：1824927