本文選題：疲勞性能 + 結(jié)構(gòu)振動　； 參考：《重慶交通大學(xué)》2014年碩士論文

【摘要】：隨著我國對西部山區(qū)的建設(shè)和運輸?shù)陌l(fā)展，大量的載重貨車要通過公路運輸，而這些運輸荷載遠(yuǎn)遠(yuǎn)超過了設(shè)計規(guī)范標(biāo)準(zhǔn)。再者，現(xiàn)有公路工程上廣泛建造的鋼筋混凝土梁橋由于長期超負(fù)荷營運，再加上其設(shè)計時并沒有考慮橋梁車致振動對于橋梁壽命的影響，導(dǎo)致近年來橋梁因疲勞損傷而發(fā)生事故的慘劇屢見不鮮。因此，公路運輸路線上的橋梁是否能滿足我國交通運輸發(fā)展的需要，載重貨物車輛通過橋梁后橋梁整體和局部振動對既有橋梁的疲勞性能會產(chǎn)生多大的影響，這都是需要加倍關(guān)注的問題。 本文旨在通過對鋼筋混凝土簡支梁橋在貨車作用下的振動效應(yīng)與疲勞性能的分析，提供結(jié)構(gòu)振動加劇疲勞損傷的理論依據(jù)，揭示振動與疲勞的內(nèi)部規(guī)律。參考近年來國內(nèi)外學(xué)者在橋梁疲勞方面的研究成果，采用疲勞累積損傷理論對鋼筋混凝土簡支梁橋進(jìn)行動力疲勞分析。具體內(nèi)容有： ①通過靜力應(yīng)力變幅方法找出在汽車荷載作用下，橋梁的縱向的危險截面與應(yīng)力相對較大的危險點。 ②通過實際交通量進(jìn)行疲勞車模型的等效，利用統(tǒng)計學(xué)手段等效出了符合西部山區(qū)交通量的疲勞貨車模型；通過車輛橫向行駛位置的概率分析，以及各橫向位置的橋梁撓度分析，找出最符合實際狀態(tài)的橫向分布特點。 ③本文通過鋼筋混凝土橋梁的縱向疲勞車動態(tài)加載分析，總結(jié)了疲勞車作用下，橋梁動態(tài)響應(yīng)的縱向分布規(guī)律與疲勞性能的宏觀規(guī)律，并在此基礎(chǔ)上分析了有限元振動分析的局限性和可參考性。 ④利用通用軟件ANSYS實現(xiàn)了鋼筋混凝土橋梁在等效疲勞車動力加載情況下的應(yīng)力響應(yīng)分析，探究了結(jié)構(gòu)疲勞性能與結(jié)構(gòu)振動的內(nèi)在關(guān)系。 ⑤根據(jù)鋼筋混凝土橋梁在疲勞車動力加載情況下的動應(yīng)力響應(yīng)譜，對鋼筋混凝土簡支梁橋各個疲勞關(guān)鍵點的疲勞性能進(jìn)行了計算與評估。
[Abstract]:With the development of the construction and transportation in the western mountainous area of our country, a large number of heavy trucks have to be transported by road, and these transport loads far exceed the standard of design code.Furthermore, the existing reinforced concrete beam bridges, which are widely built on existing highway projects, are operated because of long-term overloading, and their design does not take into account the impact of bridge vehicle-induced vibration on the bridge life.In recent years, bridge accidents caused by fatigue damage are common.Therefore, whether the bridge on the highway transportation route can meet the needs of the development of transportation in our country, how much the whole and local vibration of the bridge after the vehicle passing through the bridge will affect the fatigue performance of the existing bridge?These are issues that require more attention.Through the analysis of the vibration effect and fatigue performance of reinforced concrete simply supported beam bridge under the action of freight car, this paper aims to provide the theoretical basis for the structural vibration to aggravate the fatigue damage, and to reveal the internal law of vibration and fatigue.Referring to the research results of bridge fatigue at home and abroad in recent years, the fatigue cumulative damage theory is used to analyze the dynamic fatigue of reinforced concrete simply supported beam bridge.Specific elements include:The main results are as follows: (1) by means of static stress amplitude variation method, the dangerous cross section of the bridge longitudinal and the dangerous point with relatively large stress are found under the action of automobile load.(2) the fatigue vehicle model is equivalent through the actual traffic volume, the fatigue truck model is equivalent to the traffic volume in the western mountainous area by statistical means, and the probability analysis of the vehicle's lateral driving position is given.And the deflection analysis of each lateral position of the bridge, find out the most suitable for the actual state of the transverse distribution characteristics.Through the dynamic analysis of longitudinal fatigue vehicle of reinforced concrete bridge, the longitudinal distribution law of dynamic response and the macroscopic law of fatigue performance of bridge under the action of fatigue vehicle are summarized in this paper.On this basis, the limitations and referential properties of finite element vibration analysis are analyzed.(4) the stress response analysis of reinforced concrete bridges under the dynamic loading of equivalent fatigue vehicle is realized by using the general software ANSYS, and the internal relationship between the fatigue performance of the structure and the structural vibration is explored.5. According to the dynamic stress response spectrum of reinforced concrete bridge under dynamic loading, the fatigue performance of each fatigue key point of reinforced concrete simply supported beam bridge is calculated and evaluated.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441.3

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本文編號：1773579