本文選題：標(biāo)準(zhǔn)疲勞車 + S-N曲線��； 參考：《大連海事大學(xué)》2014年碩士論文

【摘要】：論文基于有限元軟件ANSYS對遼寧省大連市長山大橋進(jìn)行車輛荷載作用下的結(jié)構(gòu)疲勞分析及壽命評估,長山大橋是國內(nèi)東北地區(qū)首座跨海預(yù)應(yīng)力矮塔斜拉橋。 首先對國內(nèi)外矮塔斜拉橋的發(fā)展概況以及疲勞分析進(jìn)展作了對比和總結(jié)。從橋梁結(jié)構(gòu)上來講,部分斜拉橋不同于普通斜拉橋,部分斜拉橋的斜拉索實質(zhì)上起著體外預(yù)應(yīng)力索的作用,是一種剛?cè)岵?jì)的橋型,國內(nèi)外越來越多矮塔斜拉橋的出現(xiàn)為橋梁的發(fā)展提供了更為廣闊的空間。近年來,橋梁因疲勞破壞而造成的事故層出不窮,結(jié)構(gòu)的疲勞問題也逐漸成為國內(nèi)外學(xué)者研究的重點。 疲勞車輛載荷譜的確定是研究車載下橋梁疲勞特性的關(guān)鍵,確定方法主要有規(guī)范法、調(diào)查法和實測法。英國的BS5400新疲勞設(shè)計規(guī)范、美國AASHTO公路橋梁設(shè)計規(guī)范以及歐洲鋼結(jié)構(gòu)疲勞設(shè)計規(guī)范中對標(biāo)準(zhǔn)疲勞車均有規(guī)定,本文由于長山大橋尚未通車,這里將采用美國標(biāo)準(zhǔn)疲勞模型車來進(jìn)行加載。 根據(jù)結(jié)構(gòu)靜力分析確定疲勞“熱點”,這里主要對橋梁結(jié)構(gòu)的斜拉索、主梁跨中、塔梁墩固結(jié)處、邊跨跨中以及中跨跨中部分進(jìn)行了結(jié)構(gòu)疲勞分析,結(jié)構(gòu)的疲勞取決于反復(fù)荷載作用下節(jié)點的應(yīng)力幅值。對于斜拉索來講,找出行車荷載下應(yīng)力幅最大的拉索,并根據(jù)該拉索的S-N曲線以及疲勞損傷準(zhǔn)則對該拉索進(jìn)行壽命評估,論文還分析了各拉索在行車荷載作用下的應(yīng)力變化規(guī)律；對于鋼筋混凝土梁段,繪制主梁梁段疲勞“熱點”處的影響線以尋找出該“熱點”的最不利荷載位置,然后結(jié)合鋼筋混凝土梁的疲勞特性并利用疲勞分析軟件FE-SAFE對其壽命進(jìn)行評估。 根據(jù)以上分析結(jié)果,對矮塔斜拉橋的疲勞分析方法進(jìn)行了總結(jié),為斜拉橋的疲勞分析及壽命評估提供了一些依據(jù)。
[Abstract]:Based on the finite element software ANSYS, the structural fatigue analysis and life evaluation of Changshan Bridge in Dalian City, Liaoning Province, under vehicle load are carried out. Changshan Bridge is the first cable stayed bridge in Northeast China. Firstly, the development and fatigue analysis of the cable-stayed bridge with low tower at home and abroad are compared and summarized. In terms of bridge structure, partial cable-stayed bridge is different from ordinary cable-stayed bridge. The emergence of more and more cable-stayed bridges with short towers at home and abroad provides a broader space for the development of bridges. In recent years, the accidents caused by fatigue damage of bridges have emerged one after another, and fatigue problems of structures have gradually become the focus of domestic and foreign scholars. The determination of fatigue vehicle load spectrum is the key to study the fatigue characteristics of bridge under vehicle. The determination methods mainly include normative method, investigation method and actual measurement method. The new fatigue design code of BS5400 in Britain, the design code of AASHTO highway bridge in the United States and the fatigue design code of steel structure in Europe are all stipulated in the standard fatigue vehicle. In this paper, the Changshan Bridge has not been opened to traffic. An American standard fatigue model car will be used here for loading. According to the static analysis of the structure, the fatigue "hot spot" is determined. In this paper, the structural fatigue analysis is mainly carried out for the stayed cables of the bridge structure, the middle span of the main beam, the consolidation place of the pier of the tower beam, the middle part of the side span and the middle part of the middle span. The fatigue of the structure depends on the stress amplitude of the joints under repeated loads. For cable-stayed cables, the cable with the largest stress amplitude under driving load is found, and the life of the cable is evaluated according to the S-N curve of the cable and the fatigue damage criterion. The paper also analyzes the stress variation law of each cable under traffic load, for the reinforced concrete beam section, draws the influence line at the fatigue "hot spot" of the main beam section to find out the most unfavorable load position of the "hot spot". Then the fatigue characteristics of reinforced concrete beams and the fatigue analysis software FE-SAFE are used to evaluate the fatigue life of reinforced concrete beams. Based on the above analysis results, the fatigue analysis method of cable-stayed bridge with low tower is summarized, which provides some basis for fatigue analysis and life evaluation of cable-stayed bridge.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U448.27;U441.4

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