【摘要】：結(jié)合梁斜拉橋具有施工快捷、跨越能力較大和較為經(jīng)濟(jì)等優(yōu)勢,在中國近年來得到了廣泛的應(yīng)用,可以說,結(jié)合梁斜拉橋是大跨橋梁中較為具有競爭力的橋型之一。由于結(jié)合梁斜拉橋也是一種高次超靜定的復(fù)雜結(jié)構(gòu),再加上獨(dú)特的懸臂拼裝施工工藝,施工中斜拉索索力的調(diào)整,施工拼裝的線性控制、結(jié)構(gòu)自重和施工外加荷載與設(shè)計(jì)值的偏差等因素,都會(huì)對最終成橋狀態(tài)的線形與應(yīng)力分布產(chǎn)生較大的影響。由于主梁框架、橫梁、混凝土橋面板等構(gòu)件是事先在預(yù)制場預(yù)制好的,然后現(xiàn)場進(jìn)行懸臂拼裝,用高強(qiáng)螺栓進(jìn)行連接,因此,嚴(yán)格把關(guān)施工控制成為了結(jié)合梁斜拉橋施工的關(guān)鍵。本文基于西固黃河大橋擬建工程項(xiàng)目,探討了結(jié)合梁斜拉橋施工全過程中的靜力性能做了一些研究。查閱相關(guān)文獻(xiàn),了解了結(jié)合梁斜拉橋的起源、發(fā)展與分類,還簡單介紹了鋼混結(jié)合梁的特點(diǎn)、分類及結(jié)合梁斜拉橋的國內(nèi)外的發(fā)展現(xiàn)狀。斜拉橋是高次超靜定結(jié)構(gòu),施工階段受力相對較復(fù)雜,從而對斜拉橋的施工階段受力特點(diǎn)和規(guī)律進(jìn)行了總結(jié)。詳細(xì)地?cái)⑹隽擞邢拊匠痰臄?shù)值解法和施工過程分析方法。以蘭州西固黃河大橋擬建工程項(xiàng)目為背景,根據(jù)斜拉橋結(jié)構(gòu)設(shè)計(jì)原理、施工階段受力特點(diǎn)及其懸臂拼裝施工工藝,借助Midas Civil 2012通用有限元橋梁軟件,分別建立西固黃河大橋施工全過程有限元雙主梁模型和簡化模型,運(yùn)用正裝分析法確定了合理的成橋狀態(tài),對其關(guān)鍵施工階段的主梁位移和應(yīng)力做對比分析,以校核模型的準(zhǔn)確性。對該橋施工過程靜力進(jìn)行了系統(tǒng)性分析,分析得出懸臂拼裝施工過程中的主塔縱向位移、主塔應(yīng)力、主梁豎向位移、主梁內(nèi)力、主梁應(yīng)力、橋面板應(yīng)力和斜拉索索力的變化。并通過分析得出各施工階段結(jié)構(gòu)位移、內(nèi)力和應(yīng)力的變化規(guī)律,結(jié)果表明:施工階段中各項(xiàng)指標(biāo)滿足規(guī)范要求,結(jié)構(gòu)受力安全,成橋狀態(tài)下主梁、主塔和斜拉索索力均滿足成橋目標(biāo)的要求。另外,在正常使用階段,進(jìn)行了兩種荷載基本組合,檢算了該橋分別在這兩種作用效應(yīng)組合荷載工況下,主梁應(yīng)力、主塔應(yīng)力和斜拉索的安全系數(shù)滿足相關(guān)規(guī)范要求,結(jié)構(gòu)受力是安全的。
[Abstract]:Combined girder cable-stayed bridge has the advantages of quick construction, large span capacity and more economical. It has been widely used in China in recent years. It can be said that the combined girder cable-stayed bridge is one of the more competitive bridge types in long-span bridges. Combined with beam cable-stayed bridge is also a kind of high order statically indeterminate complex structure, plus the unique cantilever assembling construction technology, the adjustment of cable-stayed cable force in construction, and the linear control of construction assembly. The factors such as the weight of the structure and the deviation between the construction load and the design value will have a great influence on the line shape and stress distribution of the final bridge state. Because the main beam frame, crossbeam, concrete deck slab and other components are prefabricated in the precast yard, then the cantilever assembly is carried out in the field, and the high strength bolts are used to connect, so, Strict control of construction has become the key to the construction of cable-stayed bridge combined with beam. Based on the proposed project of Xigu Yellow River Bridge, this paper discusses the static performance of the girder cable-stayed bridge during the construction process. The origin, development and classification of cable-stayed bridge with composite beam are discussed in this paper. The characteristics of steel-concrete composite beam, the classification and the development of cable-stayed bridge with composite beam at home and abroad are also briefly introduced. The cable-stayed bridge is a high-order statically indeterminate structure, which is relatively complicated in construction stage. Therefore, the stress characteristics and law of cable-stayed bridge in construction stage are summarized. The numerical solution of finite element equation and the analysis method of construction process are described in detail. Taking the proposed project of Lanzhou Xigu Yellow River Bridge as the background, according to the design principle of cable-stayed bridge structure, the stress characteristics of the construction stage and the construction technology of cantilever assembly, the general finite element bridge software Midas Civil 2012 is used. The finite element double main beam model and the simplified model of Xigu Yellow River Bridge during the whole construction process are established respectively. The reasonable state of the bridge is determined by using the normal fitting analysis method, and the displacement and stress of the main beam in the key construction stage are compared and analyzed. To check the accuracy of the model. Based on the systematic analysis of the static force during the construction of the bridge, the changes of the longitudinal displacement of the main tower, the stress of the main tower, the vertical displacement of the main beam, the internal force of the main beam, the stress of the deck slab and the cable force of the cable are obtained. And through the analysis of the structural displacement, internal force and stress changes in each construction phase, the results show that: in the construction stage, the indexes meet the requirements of the code, the structure is safe, the main beam under the state of the bridge, Both the main tower and cable-stayed cable force meet the requirements of the bridge target. In addition, in the normal service stage, two basic combinations of loads are carried out. Under the combined load conditions of the two effects respectively, the stress of the main beam, the stress of the main tower and the safety factor of the stay cables meet the requirements of the relevant codes. The force on the structure is safe.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U445;U448.27

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本文編號：2164964