【摘要】：懸索橋是一種常見的結構形式,它優(yōu)美的橋型和強大的地域適應性,越來越多被運用在我國的公路鐵路交通領域。人們通常將橋梁建在重要的交通樞紐處,地震來的時候如果橋梁被破壞,災后救援和災后重建將受到極大影響,因此國內外學者對大跨度懸索橋的抗震進行了大量研究,但對于單塔懸索橋的研究還比較少,而且規(guī)范對懸索橋抗震尚未有完善要求,因此對單塔地錨式鋼桁加勁懸索橋的進行地震反應分析,獲得規(guī)律性結論以指導類似的抗震設計是十分有意義的。本文依托福建沙縣府前新懸索橋,對單塔懸索橋的抗震性能進行分析研究。沙縣府前新懸索橋是一座單塔鋼桁架懸索橋,有兩個主跨,皆為112米。鋼桁架是一種比較新的結構形式。本文運用MIDAS/CIVIL2013有限元軟件對福建省沙縣府前新懸索橋建立了動力模型,分別對該模型進行動力特性分析、反應譜分析和動態(tài)時程分析,綜合概述如下：首先,介紹了迄今為止國內外懸索橋的發(fā)展歷史,并有重點的介紹了橋梁地抗震分析現(xiàn)狀,并明確了本文的研究目標和研究內容。其次,詳細介紹了沙縣府前新懸索橋動力計算模型的建模過程,具體分析了對主纜、主塔、鋼桁架以及邊界條件的模擬,并記錄了成橋后的橋梁線形,分析了主塔、主纜和加勁梁剛度的改變對單塔懸索橋動力性能的影響,可以為單塔地錨鋼桁加勁梁懸索橋結構體系的動力設計提供依據(jù)。然后,對抗震設防水準和反應譜分析理論做了簡要介紹,接著又概括了反應譜理論的地震作用計算方法和組合方法,再根據(jù)新沙縣府前懸索橋的地質情況,參照相關規(guī)范,對新沙縣府前懸索橋進行反應譜分析,對結構物輸入七種不同方向的地震波,得出了主塔底部的內力和塔頂與主梁跨中的位移。最后,對新沙縣府前懸索橋進行地震時程響應分析,分析在不同地震波作用下單塔懸索橋的動力特性及地震響應,并比較了反應譜法和時程法在單塔懸索橋抗震分析上的異同。
[Abstract]:Suspension bridge is a common structural form. It is more and more used in the field of highway and railway transportation because of its beautiful bridge type and strong regional adaptability. People usually build bridges at important transportation hubs. If bridges are damaged when earthquakes come, rescue after disasters and reconstruction after disasters will be greatly affected. Therefore, scholars at home and abroad have done a lot of research on the earthquake resistance of long-span suspension bridges. However, there are few researches on single tower suspension bridge, and the seismic response of single tower ground anchor steel truss suspension bridge is not yet perfect in the code, so the seismic response analysis of single tower ground anchor steel truss suspension bridge is carried out. It is very meaningful to obtain regular conclusions to guide similar seismic design. Based on the new suspension bridge in front of Shaxian County, Fujian Province, the aseismic performance of single tower suspension bridge is analyzed and studied in this paper. The new suspension bridge in front of Shaxian government is a single tower steel truss suspension bridge with two main spans of 112 meters. Steel truss is a relatively new structural form. In this paper, MIDAS/CIVIL2013 finite element software is used to establish the dynamic model of the new suspension bridge in front of Shaxian County, Fujian Province. The dynamic characteristics analysis, response spectrum analysis and dynamic time history analysis of the model are carried out, which are summarized as follows: firstly, This paper introduces the development history of suspension bridges at home and abroad up to now, and emphatically introduces the present situation of seismic analysis of bridges, and clarifies the research objectives and contents of this paper. Secondly, the modeling process of the dynamic calculation model of the new suspension bridge in front of Shaxian prefecture is introduced in detail, and the simulation of the main cable, the main tower, the steel truss and the boundary conditions is analyzed in detail, and the bridge alignment after the bridge is recorded, and the main tower is analyzed. The influence of the stiffness of the main cable and stiffened beam on the dynamic performance of the single tower suspension bridge can provide a basis for the dynamic design of the single tower ground anchor steel truss stiffened beam suspension bridge. Then, the theory of seismic fortification level and response spectrum analysis is briefly introduced, and then the calculation method and combination method of seismic action of response spectrum theory are summarized. According to the geological conditions of the suspension bridge in front of Xinsha County, the relevant codes are referred to. By analyzing the response spectrum of the suspension bridge in front of Xinsha county, the internal force at the bottom of the main tower and the displacement between the top of the tower and the span of the main beam are obtained. Finally, the seismic time-history response analysis of the suspension bridge in Xinsha County is carried out, the dynamic characteristics and seismic response of the single tower suspension bridge under different seismic waves are analyzed, and the similarities and differences between the response spectrum method and the time-process method in the seismic analysis of the single tower suspension bridge are compared.
【學位授予單位】：福州大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U442.55;U448.25

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