本文關(guān)鍵詞：大跨度分體式鋼箱梁斜拉橋極限承載力分析　出處：《合肥工業(yè)大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 大跨度 分體式鋼箱梁 斜拉橋 非線性 極限承載力 參數(shù)分析

【摘要】：主跨806m的蕪湖長江公路二橋具有分體式鋼箱梁、四索面斜拉橋的結(jié)構(gòu)特點(diǎn),這使得每一幅單梁可以由兩幅索面懸掛,獨(dú)立性較好,通過一定間距的箱形橫梁連接共同受力。本文主要研究蕪湖長江公路二橋的極限承載能力,并對(duì)其進(jìn)行參數(shù)分析,旨在搞清分體式鋼箱梁斜拉橋的極限承載力的機(jī)理,從整體上把握橋梁的極限承載力行為和安全儲(chǔ)備,不僅可為同類型橋梁的設(shè)計(jì)提供參考,也可為蕪湖長江公路二橋健康監(jiān)測(cè)系統(tǒng)設(shè)計(jì)提供依據(jù)。論文的主要研究工作及其結(jié)論包括：1.建立了蕪湖長江公路二橋的雙主梁有限元模型,進(jìn)行了彈性穩(wěn)定的特征值屈曲分析,分析了橫梁剛度對(duì)分體式鋼箱梁斜拉橋整體彈性穩(wěn)定性的影響。計(jì)算結(jié)果表明：一階失穩(wěn)模態(tài)為面內(nèi)失穩(wěn),增大橫梁剛度會(huì)提高結(jié)構(gòu)整體穩(wěn)定性。2.考慮幾何和材料雙重非線性,計(jì)算了蕪湖長江公路二橋的極限承載力,并研究了結(jié)構(gòu)非線性因素對(duì)大跨度分體式鋼箱梁斜拉橋極限承載力的影響,分析了破壞路徑。結(jié)果顯示：在全橋均布活載作用下,跨中斜拉索的失效導(dǎo)致了全橋極限承載力的喪失。因此斜拉橋的極限承載力是由斜拉索的材料非線性控制的。3.重點(diǎn)分析了各種參數(shù)對(duì)大跨度分體式鋼箱梁斜拉橋極限承載力的影響。比較了漂浮體系、半漂浮體系和剛構(gòu)體系三種不同結(jié)構(gòu)體系下斜拉橋的整體受力和極限承載力,分別對(duì)比了不同荷載分布方式對(duì)結(jié)構(gòu)極限承載力的影響,分析了單幅均布活荷載下索力的橫向分布情況,詳細(xì)討論了結(jié)構(gòu)設(shè)計(jì)參數(shù)對(duì)極限承載力的影響。結(jié)果表明：半漂浮體系與全漂浮體系的計(jì)算結(jié)果非常接近,剛構(gòu)體系極限承載能力相對(duì)較好。荷載的分布方式對(duì)結(jié)構(gòu)極限承載力影響明顯,在極限承載力狀態(tài)下,關(guān)鍵斷面處四根拉索應(yīng)力增量基本保持為線性的。因此,四幅索面在極限荷載作用下索力的橫向分配是均勻的,分體式箱梁仍保持良好的共同工作狀態(tài)。在非對(duì)稱荷載作用下,橫梁間距對(duì)結(jié)構(gòu)的極限承載力有重要影響。改變輔助墩到邊墩的距離,僅對(duì)輔助墩附近結(jié)構(gòu)的內(nèi)力和變形有明顯影響,對(duì)結(jié)構(gòu)極限承載力影響不明顯。
[Abstract]:806m main span of Wuhu Changjiang River Highway Bridge with split type steel box girder, four cable structure characteristics of cable-stayed bridge, which makes every single beam by two cable suspension, a good independence, the common force through the box beam spacing connection. This paper mainly studies the ultimate bearing capacity of Wuhu Yangtze River Highway Bridge, and carries on the parameter analysis, aims to find out the mechanism of ultimate split type cable-stayed bridge with steel box girder bearing capacity, bearing capacity and safety behavior limit grasp bridge as a whole, can not only provide a reference design for the same type of bridge, also can provide the basis for the design of Wuhu Changjiang Highway Bridge health monitoring system research. The work and conclusions of this thesis include: 1. established a double beam finite element model of Wuhu Yangtze River Highway Bridge, the characteristics of elastic stable value buckling analysis, analyzed the stiffness of beam split type Affect the overall elastic stability of steel box girder cable-stayed bridge. The calculation results show that the first order buckling mode for in-plane buckling, increasing the stiffness of beams will improve the overall stability of the structure of.2. considering the geometry and material nonlinearity, the ultimate bearing capacity of Wuhu Yangtze River Highway Bridge are calculated, and the influence of structural nonlinear factors on large span points the ultimate bearing capacity of separated steel box girder cable-stayed bridge, analyzes the failure path. The results showed that: in the full bridge uniform live load, span of cable failure leads to the whole bridge ultimate bearing capacity loss. Therefore the limit of the cable-stayed bridge bearing capacity is controlled by the material nonlinear cable.3. key analysis the influence of various parameters on the large span of Separated Steel Box Girders of ultimate bearing capacity of cable-stayed bridge. The floating system, semi floating system and rigid system of three different structural system of cable-stayed bridge and the stress The ultimate bearing capacity, respectively. Effects of different load patterns on the structural ultimate capacity comparison, analysis of transverse distribution of single uniform live load force, the influence of design parameters on the ultimate bearing capacity are discussed in detail. The results show that the calculation results are very close to the semi floating system and the floating system, just the ultimate bearing capacity of structure is relatively good. The distribution of loads on the structure bearing capacity significantly, in the state of ultimate bearing capacity, the key section of four cables stress increment is essentially linear. Therefore, four pieces of cable under the action of the ultimate load of cable force transverse distribution is uniform, split the box girder remained together in good working condition. Under non symmetrical load, transverse spacing has important influence on the ultimate bearing capacity of structure. The change of auxiliary pier pier to the distance, only the Auxiliary Pier nearby The internal force and deformation of the structure have obvious influence, and the influence on the ultimate bearing capacity of the structure is not obvious.

【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：U441;U448.27

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本文編號(hào)：1415081