發(fā)布時(shí)間：2018-02-09 22:00

  本文關(guān)鍵詞： 大跨度 地震響應(yīng)分析 纖維模型 非線性　出處：《青島理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來(lái),伴隨我國(guó)經(jīng)濟(jì)的蓬勃發(fā)展,大跨度斜拉橋憑借其新穎的構(gòu)造、合理的受力形態(tài)及較強(qiáng)的跨越能力在道路交通工程中得到了廣泛應(yīng)用。大跨度斜拉橋作為一個(gè)地區(qū)的交通樞紐工程,往往對(duì)整個(gè)地區(qū)的經(jīng)濟(jì)發(fā)展具有很強(qiáng)的帶動(dòng)作用。因此,研究分析大跨度斜拉橋地震動(dòng)作用下的響應(yīng)問(wèn)題,確保其在地震作用下的安全性是十分必要的。本文首先闡述了近現(xiàn)代階段斜拉橋發(fā)展的歷程和目前廣泛使用的地震動(dòng)響應(yīng)分析方法;然后,以現(xiàn)有一座雙塔雙索面斜拉橋(鋼筋預(yù)應(yīng)力混凝土結(jié)構(gòu))為工程背景,通過(guò)大型有限元分析軟件MIDAS/CIVIL建立了該橋的三維空間有限元模型,對(duì)其進(jìn)行了自振特性和地震動(dòng)響應(yīng)的分析研究。研究如下:(1)本文首先闡述了大跨度斜拉橋的基本特點(diǎn)及國(guó)內(nèi)外發(fā)展歷程;探討了大跨度斜拉橋地震動(dòng)響應(yīng)分析的必要性和當(dāng)前斜拉橋地震動(dòng)響應(yīng)分析存在的一些問(wèn)題。(2)闡述當(dāng)前橋梁地震動(dòng)響應(yīng)分析的一些基本理論;主要分析了當(dāng)前使用較為廣泛的反應(yīng)譜法和時(shí)程分析法,并給出了相應(yīng)的計(jì)算公式。(3)以有限元軟件MIDAS/CIVIL為計(jì)算分析平臺(tái),建立了工程實(shí)例的三維空間有限元模型,對(duì)該斜拉橋的自振周期、振型等結(jié)構(gòu)特性進(jìn)行了分析研究。(4)通過(guò)計(jì)算斜拉橋的有效振型參與質(zhì)量,確定了參與反應(yīng)譜法分析的振型模態(tài)階數(shù);同時(shí)按照相關(guān)規(guī)范并結(jié)合橋址所在場(chǎng)地條件,確定了結(jié)構(gòu)的設(shè)計(jì)反應(yīng)譜;進(jìn)行了5種地震動(dòng)工況輸入下的反應(yīng)譜法分析。(5)根據(jù)規(guī)范相關(guān)規(guī)定以及橋址的地震特性,選取合適的地震波作為地震動(dòng)輸入波;重點(diǎn)考慮了索塔的材料非線性對(duì)斜拉橋的地震動(dòng)響應(yīng)分析的影響,從而對(duì)斜拉橋進(jìn)行了線性時(shí)程及借助索塔纖維模型的非線性時(shí)程一致激勵(lì)下地震動(dòng)響應(yīng)分析。(6)通過(guò)對(duì)比分析反應(yīng)譜法和時(shí)程分析法在各種工況下橋梁關(guān)鍵部位內(nèi)力和位移響應(yīng)的結(jié)果,得出相關(guān)結(jié)論。
[Abstract]:In recent years, with the vigorous economic development of our country, the long-span cable-stayed bridge with its novel structure, The reasonable force form and the strong span ability have been widely used in the road traffic engineering. The long-span cable-stayed bridge, as a traffic hub project in one area, often has a strong driving effect on the economic development of the whole area. The response of long-span cable-stayed bridges under ground motion is studied and analyzed. It is very necessary to ensure the safety of cable-stayed bridges under earthquake action. This paper first describes the development of cable-stayed bridges in modern times and the widely used seismic response analysis methods. Based on a two-tower and double-cable plane cable-stayed bridge (reinforced prestressed concrete structure), the three-dimensional finite element model of the bridge is established by the large-scale finite element analysis software MIDAS/CIVIL. The characteristics of the long-span cable-stayed bridge and the history of its development at home and abroad are discussed in this paper. This paper discusses the necessity of ground motion response analysis of long-span cable-stayed bridge and some problems existing in ground motion response analysis of cable-stayed bridge at present. This paper mainly analyzes the response spectrum method and time history analysis method which are widely used at present, and gives the corresponding calculation formula. (3) based on the finite element software MIDAS/CIVIL as the platform of calculation and analysis, the three-dimensional finite element model of engineering example is established. Based on the analysis of the structural characteristics of the cable-stayed bridge, such as the natural vibration period and the mode shape, the modal order of the cable-stayed bridge is determined by calculating the effective mode participation quality of the cable-stayed bridge. At the same time, according to the relevant codes and the site conditions of the bridge site, the design response spectrum of the structure is determined, and the response spectrum method under the input of five ground motion conditions is carried out to analyze the seismic characteristics of the bridge site according to the relevant regulations of the code and the seismic characteristics of the bridge site. The suitable seismic wave is chosen as the input wave of the ground motion, and the influence of the material nonlinearity of the cable tower on the seismic response analysis of the cable-stayed bridge is considered. Thus, the linear time-history of cable-stayed bridge and the analysis of ground motion response under nonlinear time-history uniform excitation with the help of cable tower fiber model are carried out. The response spectrum method and time-history analysis method are compared and analyzed in the key parts of the bridge under various working conditions. The results of the force and displacement response, Draw relevant conclusions.
【學(xué)位授予單位】：青島理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U448.27;U442.55

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