本文選題：混合梁斜拉橋 + 鋼混結(jié)合段�。� 參考：《重慶交通大學(xué)》2015年碩士論文

【摘要】：本文依托重慶已完工項(xiàng)目—永川長(zhǎng)江大橋?yàn)楸尘肮こ?采用Midas/FEA與Midas/Civil對(duì)混合梁斜拉橋鋼混結(jié)合段受力性能進(jìn)行分析。對(duì)于大跨徑混合梁斜拉橋,主跨鋼梁與邊跨預(yù)應(yīng)力混凝土梁之間的結(jié)合段是混合梁橋的重要組成部分。結(jié)合段位置的合理性與構(gòu)造的可靠性,是影響混合梁橋設(shè)計(jì)施工的關(guān)鍵問(wèn)題。在考慮鋼混結(jié)合段的受力性能時(shí),在功能上應(yīng)能夠使各種內(nèi)力(軸力、彎矩、剪力、扭矩)在鋼梁與混凝土梁之間可靠、順暢傳遞。在構(gòu)造上應(yīng)使兩部分梁體外形協(xié)調(diào)一致,盡可能避免剛度和強(qiáng)度突變,保證結(jié)合段具有良好的抗疲勞性和耐久性。當(dāng)前國(guó)內(nèi)外許多學(xué)者針對(duì)鋼混結(jié)合段受力特性問(wèn)題做了大量的研究工作,得出了許多已經(jīng)成熟的理論。本文在前人研究的基礎(chǔ)上,主要對(duì)以下內(nèi)容進(jìn)行了研究:①重慶永川長(zhǎng)江大橋的斜拉索為空間索布置,并非傳統(tǒng)的平面索布置,大橋及鋼混結(jié)合段的空間效應(yīng)較為明顯。針對(duì)這一特點(diǎn),對(duì)鋼混結(jié)合段的受力性能進(jìn)行空間有限元分析;②采用Midas/Civil建立全橋模型分析大橋在懸臂拼裝施工過(guò)程中鋼混結(jié)合段的內(nèi)力變化;以及合攏前后,體系轉(zhuǎn)換過(guò)程前后鋼混結(jié)合段的受力性能變化情況,從全橋整體受力角度對(duì)鋼混結(jié)合段受力進(jìn)行分析;③通過(guò)大型有限元軟件Midas/FEA對(duì)鋼混結(jié)合段建立空間有限元計(jì)算模型,對(duì)鋼混結(jié)合段的材料特性,邊界約束等進(jìn)行仿真模擬,以求理論計(jì)算結(jié)果與實(shí)際情況相吻合;④根據(jù)全橋有限元模型所提取的施工階段及成橋運(yùn)營(yíng)階段中荷載工況,選取代表性工況將其施加于實(shí)體仿真模型中進(jìn)行細(xì)部對(duì)比分析,探討鋼混結(jié)合段受力性能。
[Abstract]:Based on the Chongqing completed project, Yongchuan Yangtze River Bridge, this paper uses Midas/FEA and Midas/Civil to analyze the mechanical behavior of the steel-concrete joint section of the hybrid girder cable-stayed bridge. For long span hybrid girder cable-stayed bridge, the joint section between main span steel beam and side span prestressed concrete beam is an important part of hybrid beam bridge. The rationality of the position of the combined section and the reliability of the structure are the key problems affecting the design and construction of the hybrid beam bridge. When considering the mechanical behavior of the steel concrete joint section, the internal forces (axial force, bending moment, shear force, torque) should be able to transfer reliably and smoothly between the steel beam and concrete beam. In construction, the shape of the two parts of the beam should be consistent, the sudden change of stiffness and strength should be avoided as far as possible, and the fatigue resistance and durability of the joint should be guaranteed. At present, many scholars at home and abroad have done a lot of research work on the mechanical characteristics of steel concrete joint section, and got a lot of mature theory. On the basis of previous studies, this paper mainly studies the following contents: 1. The cable-stayed cable arrangement of the Chongqing Yongchuan Yangtze River Bridge is a space cable arrangement, not the traditional plane cable arrangement. The spatial effect of the bridge and the steel-concrete joint section is obvious. In view of this characteristic, the spatial finite element analysis on the mechanical behavior of steel concrete joint section is carried out. The Midas/Civil model is adopted to analyze the internal force change of the steel concrete joint section during the cantilever assembly construction, and before and after closure. In this paper, the mechanical behavior of the steel-concrete joint before and after the system conversion process is analyzed. The stress of the steel-concrete joint section is analyzed from the point of view of the whole bridge. The spatial finite element calculation model of the steel-concrete joint section is established by using the large-scale finite element software Midas/FEA. The material characteristics and boundary constraints of the steel-concrete joint section are simulated in order to obtain the theoretical calculation results in accordance with the actual situation. 4. According to the whole bridge finite element model, the load conditions in the construction stage and the operation stage of the bridge are obtained. Select the representative working condition to apply it to the entity simulation model to carry on the detailed contrast analysis, discuss the mechanical behavior of the steel-concrete joint section.
【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)】：U441;U448.27

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本文編號(hào)：1788609