本文選題：大跨度公鐵兩用斜拉橋　切入點：穩(wěn)定性理論　出處：《北京交通大學》2015年碩士論文

【摘要】：本文以某大跨度公鐵兩用斜拉橋為工程背景,通過理論分析和有限元數(shù)值模擬計算兩種方法對其穩(wěn)定性進行研究,分別得到大跨度公鐵兩用斜拉橋施工階段和成橋狀態(tài)下的穩(wěn)定性分布規(guī)律,為今后大跨度公鐵兩用斜拉橋的設計分析提供技術參考。本文主要完成了以下研究工作： (1)詳細闡述了公鐵兩用斜拉橋的發(fā)展狀況和結(jié)構特點,結(jié)構穩(wěn)定性分析理論、分析方法和斜拉橋穩(wěn)定分析的有限元理論,并對斜拉橋穩(wěn)定安全系數(shù)標準進行了探討分析。 (2)采用大型有限元軟件Midas Civil建立大跨度公鐵兩用斜拉橋有限元模型,并對其施工階段和成橋狀態(tài)分別進行穩(wěn)定性分析。根據(jù)計算分析結(jié)果,獲得了大跨度公鐵兩用斜拉橋的屈曲模態(tài)和穩(wěn)定安全系數(shù)的變化趨勢,結(jié)果表明,大跨度公鐵兩用斜拉橋在成橋階段易發(fā)生整體穩(wěn)定性問題,而在施工階段更易發(fā)生局部穩(wěn)定性問題。 (3)根據(jù)《鋼結(jié)構設計規(guī)范》(GB50017-2003)和《鐵路橋梁鋼結(jié)構設計規(guī)范》(TB10002.2-2005)中壓彎桿件的計算公式,對最大雙懸臂、最大單懸臂和成橋階段三個典型施工階段最不利桿件進行了桿件穩(wěn)定性計算分析。分析結(jié)果表明,采用理論公式計算方法得到的數(shù)值結(jié)果與采用有限元方法得到的第二類穩(wěn)定性計算分析結(jié)果吻合較好。 (4)對大跨度公鐵兩用斜拉橋施工階段有限元模型進行穩(wěn)定性分析,根據(jù)所建立的有限元模型,分別考慮主桁類型、主桁高度、主塔剛度及斜拉索面積的變化對施工階段穩(wěn)定性的影響。并考慮施工方法的改變對施工階段穩(wěn)定性的影響,施工方法的改變對施工階段的穩(wěn)定性具有顯著影響。 (5)根據(jù)所建立的有限元模型,考慮最大雙懸臂、最大單懸臂和成橋階段三個典型施工階段不同位置斜拉索斷裂的影響,并進行計算分析。根據(jù)計算分析結(jié)果可知斜拉索斷裂對穩(wěn)定性具有一定影響,應引起設計、施工和養(yǎng)護維修的注意,確保結(jié)構安全。 綜上所述,本文通過對大跨度公鐵兩用斜拉橋的有限元模型進行計算分析,得到其施工階段第一類和第二類穩(wěn)定性規(guī)律,并考慮設計參數(shù)的改變對施工階段及成橋狀態(tài)穩(wěn)定性的影響,為同類斜拉橋設計提供一定的技術參考。
[Abstract]:In this paper, based on the engineering background of a large-span cable-stayed bridge, the stability of the bridge is studied by means of theoretical analysis and finite element numerical simulation. The stability distribution of the long-span highway / iron cable-stayed bridge under the construction stage and the completed state is obtained respectively, which provides a technical reference for the design and analysis of the large-span cable-stayed bridge. The main work of this paper is as follows:. 1) the development and structural characteristics, structural stability analysis theory, analysis method and finite element theory of cable-stayed bridge stability are described in detail, and the criterion of stability safety factor of cable-stayed bridge is discussed. The finite element model of the large-span cable-stayed bridge is established by Midas Civil, and the stability of the bridge is analyzed in the construction stage and the state of the bridge. The variation trend of buckling mode and stability safety factor of large-span cable-stayed bridge is obtained. The results show that the overall stability of long-span cable-stayed bridge is easy to occur in the stage of completion. However, local stability is more likely to occur in the construction stage. The maximum double cantilever is obtained according to the calculation formulas of bending members in the Code for Design of Steel structures (GB50017-2003) and the Code for Design of Steel structures of Railway Bridges (TB10002.2-2005). The stability of the most unfavorable members in the three typical construction stages of the maximum single cantilever and the bridge is calculated and analyzed. The results show that, The numerical results obtained by the theoretical formula method are in good agreement with the results of the second kind of stability analysis obtained by the finite element method. 4) the stability analysis of the finite element model of large-span double-purpose cable-stayed bridge in construction stage is carried out. According to the established finite element model, the type of main truss and the height of main truss are considered respectively. The influence of the change of the stiffness of the main tower and the area of stay cable on the stability of the construction stage and the influence of the change of the construction method on the stability of the construction phase are considered. The change of the construction method has a significant effect on the stability of the construction phase. 5) according to the established finite element model, considering the influence of the maximum double cantilever, the maximum single cantilever and the bridge stage in the three typical construction stages, the cable fracture at different positions. According to the results of calculation and analysis, it can be seen that the cable fracture has certain influence on the stability, which should arouse the attention of design, construction and maintenance to ensure the safety of the structure. To sum up, through the calculation and analysis of the finite element model of the large-span cable-stayed bridge, the stability of the first type and the second type in the construction stage is obtained. The influence of the design parameters on the stability of the construction stage and the state of the completed bridge is considered, which provides a certain technical reference for the design of the similar cable-stayed bridges.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U441;U448.27

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