發(fā)布時間：2018-09-19 08:38

【摘要】：隨著橋梁施工工藝的逐步提高,連續(xù)剛構(gòu)橋跨徑不斷增大,但隨之而來的關(guān)于如何在施工過程中控制施工安全和施工質(zhì)量成為一個棘手的問題,這就要求我們必須借助于大型有限元軟件對橋梁進(jìn)行仿真模擬,找出施工過程中的控制參數(shù),進(jìn)而更好的指導(dǎo)施工。另外,作為一個地震活動頻繁的國家,在歷次地震中,橋梁等基礎(chǔ)設(shè)施都受到了很大的破壞,橋梁結(jié)構(gòu)動力特性是評價橋梁承載能力和運(yùn)營狀況的重要指標(biāo),分析預(yù)應(yīng)力連續(xù)剛構(gòu)橋的動力特性是分析地震響應(yīng)和進(jìn)行地震設(shè)計的前提,通過橋梁結(jié)構(gòu)動力分析,可以求出結(jié)構(gòu)的各階頻率和相應(yīng)的振型,進(jìn)而了解結(jié)構(gòu)剛度大小、分布情況和結(jié)構(gòu)薄弱部位。本文以大廣高速粵境段某連續(xù)剛構(gòu)橋?yàn)楸尘?采用比較合理的結(jié)構(gòu)分析計算理論對此橋的施工階段進(jìn)行仿真分析,同時分析橋梁施工中各種參數(shù)變化對橋梁控制部位應(yīng)力和變形的影響,通過對比分析,區(qū)分出施工控制中的敏感性參數(shù)和非敏感性參數(shù),最后對該橋進(jìn)行動力特性分析和地震響應(yīng)分析,為連續(xù)剛構(gòu)橋的抗震分析提供一定的理論基礎(chǔ),本文主要通過以下幾個步驟進(jìn)行:(1)根據(jù)設(shè)計單位提供的設(shè)計圖文件以及橋梁抗震有關(guān)知識,采用MIDAS/CIVIL建立某橋的施工階段靜力模型以及成橋階段動力響應(yīng)模型。(2)利用結(jié)構(gòu)分析軟件MIDAS/CIVIL對某橋施工階段進(jìn)行合理的模擬,并研究施工過程中的參數(shù)變化對橋梁相應(yīng)施工階段控制截面內(nèi)力和位移的影響,分析得到施工敏感性參數(shù)和非敏感性參數(shù)。(3)介紹了目前常用的幾種橋梁抗震分析方法的原理,為連續(xù)剛構(gòu)橋抗震性能研究提供了理論基礎(chǔ)。(4)以大廣高速粵境段某連續(xù)剛構(gòu)橋?yàn)楸尘?介紹了動力特性計算理論,通過計算某橋各各階頻率和相應(yīng)的振型,了解此橋的動力特性。(5)以大廣高速粵境段某大跨徑連續(xù)剛構(gòu)橋?yàn)楣こ瘫尘?重點(diǎn)介紹了橋梁地震響應(yīng)理論知識,根據(jù)擬建橋梁場地狀況分別對橋梁進(jìn)行反應(yīng)譜分析和時程分析,對比分析兩種方法得出的橋梁地震響應(yīng)結(jié)果。
[Abstract]:With the gradual improvement of bridge construction technology, the span of continuous rigid frame bridge is increasing, but how to control the construction safety and construction quality in the construction process becomes a thorny problem. This requires us to use the large-scale finite element software to simulate the bridge, find out the control parameters in the construction process, and then better guide the construction. In addition, as a country with frequent earthquake activity, the bridge and other infrastructure have been destroyed greatly in the past earthquakes. The dynamic characteristics of bridge structure is an important index to evaluate the bearing capacity and operation condition of bridge. The analysis of the dynamic characteristics of prestressed continuous rigid frame bridge is the premise of seismic response analysis and seismic design. Through dynamic analysis of bridge structure, each order frequency and corresponding vibration mode of the structure can be obtained, and then the stiffness of the structure can be understood. Distribution and structural weakness. In this paper, a continuous rigid frame bridge is used as the background, and the reasonable theory of structure analysis and calculation is used to simulate and analyze the construction stage of the bridge. At the same time, the influence of various parameters on the stress and deformation of bridge control is analyzed, and the sensitive parameters and non-sensitive parameters in construction control are distinguished by comparison and analysis. Finally, the dynamic characteristics and seismic response of the bridge are analyzed, which provides a theoretical basis for the seismic analysis of the continuous rigid frame bridge. This paper mainly through the following steps: (1) according to the design documents provided by the design unit and bridge seismic knowledge, The static model and dynamic response model of a certain bridge during construction phase are established by MIDAS/CIVIL. (2) A reasonable simulation of the construction stage of a bridge is carried out by using the structure analysis software MIDAS/CIVIL. The influence of the parameter changes in the construction process on the internal force and displacement of the control section in the corresponding construction stage of the bridge is studied, and the construction sensitivity parameters and the non-sensitive parameters are obtained. (3) the principles of several commonly used seismic analysis methods for bridges are introduced. This paper provides a theoretical basis for the study of seismic behavior of continuous rigid frame bridges. (4) based on a continuous rigid frame bridge in Daguang high speed section of Guangdong province, the theory of dynamic characteristic calculation is introduced, and the frequencies and corresponding modes of each order of a bridge are calculated. To understand the dynamic characteristics of the bridge. (5) taking a long-span continuous rigid frame bridge as the engineering background, the theoretical knowledge of seismic response of the bridge is introduced emphatically, and the response spectrum and time history analysis of the bridge are carried out according to the site condition of the proposed bridge. The seismic response results obtained by the two methods are compared and analyzed.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U442.55;U448.23

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