【摘要】：雙聯(lián)體獨(dú)塔預(yù)應(yīng)力混凝土斜拉橋是斜拉橋中的一種獨(dú)特橋型,繼承獨(dú)塔斜拉橋的經(jīng)濟(jì)性、利于施工等優(yōu)點(diǎn);在主塔橫橋向的雙幅聯(lián)體構(gòu)造,增加了主塔乃至整個主橋的橫向剛度,但是結(jié)構(gòu)體系相對復(fù)雜,關(guān)于該類結(jié)構(gòu)的安全性研究相對較少,因此對該類型橋梁進(jìn)行極限承載力分析,具有非常重要意義。論文以一座在建的雙聯(lián)體獨(dú)塔四索面預(yù)應(yīng)力混凝土斜拉橋?yàn)楣こ瘫尘?采用MIDAS CIVIL分析了該橋施工階段結(jié)構(gòu)的一類穩(wěn)定問題,得出該橋型一類穩(wěn)定特征值的變化規(guī)律;同時采用ABAQUS就主要施工階段(最大雙懸臂和最大單懸臂施工階段)進(jìn)行了二類穩(wěn)定分析,且分析了該橋在公路-Ⅰ級和汽車-超20級兩種荷載下的結(jié)構(gòu)極限承載力,獲得了5中不同布載工況下的結(jié)構(gòu)穩(wěn)定安全系數(shù),以及相應(yīng)的可能破壞模式。研究結(jié)果表明:該橋在施工階段穩(wěn)定性能良好,掛籃非對稱加載對結(jié)構(gòu)穩(wěn)定性影響顯著。成橋階段,在兩種設(shè)計(jì)荷載的各個布載工況下,主橋結(jié)構(gòu)均具有良好的承載能力;大部分布載工況(除邊跨輔助墩主梁最大負(fù)彎矩工況)下,結(jié)構(gòu)達(dá)到極限承載狀態(tài)時,汽車-超20級荷載荷載下結(jié)構(gòu)安全系數(shù)要大于公路-Ⅰ級,按公路-Ⅰ級進(jìn)行理論模型計(jì)算,指導(dǎo)類似汽車-超20級車隊(duì)布置的運(yùn)營管理是偏安全的。
[Abstract]:Double pylon prestressed concrete cable-stayed bridge is a unique type of cable-stayed bridge, which inherits the economic and construction advantages of single-tower cable-stayed bridge. The lateral stiffness of the main tower and the whole main bridge is increased, but the structure system is relatively complex, and the research on the safety of this kind of structure is relatively few. Therefore, it is of great significance to analyze the ultimate bearing capacity of this type of bridge. In this paper, based on the engineering background of a two-pylon four-cable plane prestressed concrete cable-stayed bridge under construction, MIDAS CIVIL is used to analyze a kind of stability problem of the bridge structure in the construction stage, and the variation law of the stability eigenvalue of the bridge type is obtained. At the same time, ABAQUS is used to analyze the stability of the main construction stage (maximum double cantilever and maximum single cantilever construction), and the ultimate bearing capacity of the bridge under two kinds of loads of highway class 鈪，

本文編號：2219976