本文選題：鋼橋 + 疲勞分析��； 參考：《安徽理工大學(xué)》2014年碩士論文

【摘要】：橋梁是一個(gè)國(guó)家經(jīng)濟(jì)發(fā)展的命脈,隨著經(jīng)濟(jì)的發(fā)展,世界各國(guó)都在橋梁建設(shè)上投入大量的財(cái)力和人力,大量的鋼橋也隨之投入建設(shè)。然而由于疲勞斷裂引起的鋼橋垮塌事故也給人民生命財(cái)產(chǎn)造成巨大損失。所以,鋼橋疲勞性能的研究顯得尤其重要,這不但對(duì)于既有鋼橋檢定、評(píng)估及加固起著非常重要的作用,對(duì)于新橋的建設(shè)也有著指導(dǎo)意義。 如何科學(xué)地對(duì)既有鋼橋狀態(tài)進(jìn)行評(píng)估,確定鋼橋疲勞的關(guān)鍵部位,及時(shí)采取有效措施進(jìn)行修補(bǔ)和維護(hù)具有非常重要的意義。然而由于影響鋼橋疲勞問(wèn)題的因素較多,我國(guó)對(duì)鋼橋的疲勞問(wèn)題的處理仍然很不成熟。本文針對(duì)這一現(xiàn)狀,對(duì)既有公路鋼橋的疲勞損傷進(jìn)行研究,具體研究?jī)?nèi)容如下： (1)介紹鋼橋疲勞問(wèn)題重要性及研究現(xiàn)狀,對(duì)疲勞分析的一些基本概念和方法做出簡(jiǎn)要闡述。 (2)簡(jiǎn)要闡述我國(guó)公路鋼橋抗疲勞設(shè)計(jì)的規(guī)范和方法,應(yīng)用實(shí)例介紹公路鋼橋抗疲勞設(shè)計(jì)的應(yīng)用,為后續(xù)鋼橋的疲勞分析做鋪墊。 (3)建立鋼橋結(jié)構(gòu)的有限元模型,應(yīng)用有限元分析確定鋼橋疲勞的關(guān)鍵部位,對(duì)鋼橋關(guān)鍵部位進(jìn)行疲勞分析,得出其損傷及壽命周期,并對(duì)關(guān)鍵部位進(jìn)行歸納和系統(tǒng)分析。 (4)針對(duì)鋼橋關(guān)鍵部位出現(xiàn)的構(gòu)造形式進(jìn)行系統(tǒng)地研究分析。在對(duì)疲勞應(yīng)力和性能系統(tǒng)分析的基礎(chǔ)上,對(duì)關(guān)鍵部位進(jìn)行優(yōu)化構(gòu)造,提出修補(bǔ)及維護(hù)的有效措施,為后續(xù)類(lèi)似設(shè)計(jì)提供科學(xué)依據(jù)。 通過(guò)對(duì)我國(guó)公路鋼橋抗疲勞設(shè)計(jì)的實(shí)際應(yīng)用,對(duì)于制定符合我國(guó)國(guó)情的公路橋梁疲勞荷載譜具有一定的理論和現(xiàn)實(shí)意義；利用有限元分析方法,依托鋼橋?qū)嵗?對(duì)鋼橋關(guān)鍵部位進(jìn)行疲勞分析,歸納和系統(tǒng)研究疲勞細(xì)節(jié),對(duì)于指導(dǎo)鋼橋疲勞強(qiáng)度評(píng)定,為后續(xù)類(lèi)似設(shè)計(jì)提供科學(xué)指導(dǎo)也具有非常重要的意義。
[Abstract]:Bridge is the lifeblood of a country's economic development. With the development of economy, every country in the world has invested a lot of financial resources and manpower in bridge construction, and a large number of steel bridges have also been put into construction. However, the collapse of steel bridge caused by fatigue fracture also causes great loss of life and property. Therefore, the study of fatigue performance of steel bridges is particularly important, which not only plays an important role in verification, evaluation and reinforcement of existing steel bridges, How to scientifically evaluate the status of existing steel bridges, determine the key parts of fatigue of steel bridges, and take effective measures to repair and maintain them in time is of great significance. However, there are many factors that affect the fatigue of steel bridges, so it is still immature to deal with the fatigue problems of steel bridges in China. In this paper, the fatigue damage of existing highway steel bridges is studied in this paper. The specific research contents are as follows: 1) the importance and research status of fatigue problems of steel bridges are introduced. In this paper, some basic concepts and methods of fatigue analysis are briefly described. (2) the code and method of anti-fatigue design of highway steel bridges in China are briefly described, and the application of anti-fatigue design of highway steel bridges is introduced by an application example. The finite element model of the steel bridge structure is established. The key parts of the steel bridge fatigue are determined by the finite element analysis, and the damage and life cycle of the steel bridge are obtained by fatigue analysis of the key parts of the steel bridge. The key parts are summarized and systematically analyzed. 4) the structural forms of the key parts of steel bridges are systematically studied and analyzed. Based on the systematic analysis of fatigue stress and performance, this paper optimizes the structure of key parts and puts forward effective measures for repair and maintenance, which provides a scientific basis for the subsequent similar design. Through the practical application of anti-fatigue design of highway steel bridges in China, It has certain theoretical and practical significance for drawing up fatigue load spectrum of highway bridge in accordance with the national conditions of our country. Using finite element analysis method, relying on the example of steel bridge, fatigue analysis of key parts of steel bridge is carried out, and fatigue details are summarized and systematically studied. It is also of great significance to guide fatigue strength assessment of steel bridges and provide scientific guidance for similar design.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U448.36;U441.4

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本文編號(hào)：1987950