本文選題：懸索橋　切入點(diǎn)：PC板式主梁　出處：《長沙理工大學(xué)》2014年碩士論文

【摘要】：本文研究對象為貴州烏江大橋,該橋?yàn)閮芍魉敻叱滔嗤蚁滤叨炔煌膯慰鏟C板梁式懸索橋。為確保該橋的施工和成橋運(yùn)營安全,對其進(jìn)行進(jìn)行施工過程、成橋狀態(tài)的靜力分析和動力特性研究,二者具有較強(qiáng)的實(shí)際意義,主要工作內(nèi)容如下：(1)綜述了PC板梁地錨式懸索橋構(gòu)造形式及受力特點(diǎn),并總結(jié)目前懸索橋動力研究狀況。此外,對本文研究問題的提出進(jìn)行闡述,并概括主要工作。(2)簡要總結(jié)了懸索橋的主纜成橋線形計算方法,并詳細(xì)闡述了其非線性影響因素和各類頻率的估算方法。此外,綜述了結(jié)構(gòu)動力特性分析的內(nèi)容和方法,并闡明懸索橋的有關(guān)動力特點(diǎn)且對有限位移靜動力數(shù)值解法進(jìn)行歸納,為下文的烏江大橋靜動力研究提供理論基礎(chǔ)。(3)采用有限元軟件結(jié)合PC板梁懸索橋建模特點(diǎn)和烏江大橋施工特點(diǎn)建立了該橋的空問有限元模型,從而詳盡地分析了該橋施工狀態(tài)下,該橋構(gòu)件成橋狀態(tài)和施工過程中關(guān)鍵節(jié)點(diǎn)的內(nèi)力和變位影響情況,并進(jìn)行了主索鞍的頂推計算和主纜的抗滑驗(yàn)算等,驗(yàn)證了該橋的設(shè)計安全性。(4)對烏江大橋進(jìn)行動力特性研究,得出其自振特性分析結(jié)果。對比分析了施工過程中該橋自振特性變化特點(diǎn)和不同吊裝方案對其模態(tài)參數(shù)的影響,施工階段的動力破壞；此外,探究了樁-土-結(jié)構(gòu)間的作用、主梁的順橋向約束剛度等對大橋動力特性的影響,后者比前者對動力特性的影響大；探究以上因素對該橋動力特性影響的同時,重點(diǎn)研究了塔頂高程相同兩主塔下塔柱高度不同的橋塔構(gòu)型對該橋動力性能的影響,對高低塔柱的高度設(shè)計提出取值建議,從而達(dá)到合理配置塔柱剛度獲得良好的動力特性的目的。(5)對該橋運(yùn)用反應(yīng)譜法和時程分析法對其成橋狀態(tài)進(jìn)行地震響應(yīng)對比分析,得出兩種分析法對應(yīng)的內(nèi)力和位移響應(yīng)結(jié)果的差異。最后采用時程分析法,對比單向、多向多組合地震一致正交激勵對該橋的影響,從而得出該橋較為全面抗震結(jié)果,對該橋的抗震驗(yàn)算方法提出建議,確保大橋抗震可靠。
[Abstract]:The research object of this paper is the Wujiang Bridge in Guizhou, which is a single span PC-plate girder suspension bridge with the same top height of the two main towers and different lower tower column height.In order to ensure the construction and operation safety of the bridge, it is of great practical significance to carry out the construction process, the static analysis and the study of the dynamic characteristics of the completed bridge.The main work is as follows: (1) the structure and mechanical characteristics of PC slab girder ground anchor suspension bridge are summarized, and the current dynamic research status of suspension bridge is summarized.In addition, the contents and methods of structural dynamic characteristic analysis are summarized, and the related dynamic characteristics of suspension bridge are expounded, and the finite displacement static and dynamic numerical solution is summarized.This paper provides a theoretical basis for the following static and dynamic study of Wujiang Bridge. (3) the empty finite element model of Wujiang Bridge is established by using finite element software combined with the modeling characteristics of PC-slab girder suspension bridge and the construction characteristics of Wujiang Bridge.The design safety of the bridge is verified. 4) the dynamic characteristics of Wujiang Bridge are studied, and the analysis results of its natural vibration characteristics are obtained.The characteristics of natural vibration characteristics of the bridge during construction and the influence of different hoisting schemes on its modal parameters and dynamic failure in construction stage are compared and analyzed, in addition, the role of pile-soil-structure is explored.The influence of the restrained stiffness of the main girder on the dynamic characteristics of the bridge is greater than that of the former, and the influence of the above factors on the dynamic characteristics of the bridge is discussed.The influence of different tower configuration on the dynamic performance of the bridge with the same tower top height and different tower height under the main tower is studied, and suggestions for the height design of the high and low tower columns are put forward.In order to achieve the goal of reasonably allocating the column stiffness to obtain good dynamic characteristics, the response spectrum method and time history analysis method are used to compare and analyze the seismic response of the bridge.The difference of internal force and displacement response between the two methods is obtained.Finally, time history analysis method is used to compare the effect of unidirectional and multi-direction combined earthquakes on the bridge, so as to obtain the more comprehensive seismic results of the bridge, and put forward some suggestions for the seismic checking method of the bridge to ensure the seismic reliability of the bridge.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441;U448.25

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本文編號：1691814