本文選題：大懸臂蓋梁　切入點：有限元分析　出處：《長安大學》2014年碩士論文

【摘要】：在城市橋梁建設中，大懸臂蓋梁的應用日益增多，大懸臂蓋梁常與流線型橋墩搭配，線型優(yōu)美，造型流暢。由于大懸臂結構體型龐大，內(nèi)部體系受力復雜，在計算分析以及設計方法上仍然存在著尚未被完全理解和有效運用的問題，深入探討和研究此類結構具有一定的現(xiàn)實和經(jīng)濟意義。 同時，，隨著社會經(jīng)濟的快速發(fā)展，我國公路運輸中的車輛類型日益復雜，車輛大型、重型的發(fā)展的趨勢明顯。同時公路上行駛的密集大型、重型車輛所產(chǎn)生的效應，已遠遠超出了現(xiàn)行規(guī)范規(guī)定的荷載等級，由先前交通狀況所得出的規(guī)范中的荷載標準已不能代表這些現(xiàn)行重載交通下的汽車荷載。 本文針對大懸臂預應力蓋梁這一新穎結構形式，對其在設計荷載和在重載荷載作用下的安全性進行研究�；跇蛭桓浇奖さ恼{(diào)查數(shù)據(jù)，對車輛荷載數(shù)據(jù)中的各項參數(shù)進行了統(tǒng)計分析，得出了測點道路的分車型的荷載概率分布，計算分析了橋梁結構在現(xiàn)有調(diào)查荷載下的效應值。在公路-I級和調(diào)查重載汽車荷載下，計算了蓋梁的承載力安全系數(shù)，并對蓋梁的應力狀態(tài)進行了分析，確定了各類型蓋梁的最不利截面。在Midas Civil和MIDAS FEA實體分析的基礎上，提出了承載能力安全系數(shù)和最不利截面壓應力儲備可作為各類型蓋梁安全性評價的指標。 Midas Civil模型計算結果表明，Y外傾型橋墩蓋梁安全系數(shù)大于直立式橋墩蓋梁。各類型蓋梁在公路-I級荷載下安全系數(shù)均較高；在重載荷載下，Y外傾型橋墩蓋梁仍有較高的安全系數(shù)，直立式橋墩的安全系數(shù)仍大于1，但其量值相對較小。Y外傾型、直立式橋墩蓋梁的最不利截面均位于墩梁固結區(qū)域，位置稍有不同。在兩種運營荷載下，對應截面均有一定壓應力儲備，其中直立式橋墩蓋梁重載荷載下最小壓應力Midas Civil模型計算結果為-2.55MPa，MIDAS FEA計算為-4.01MPa。 通過對典型蓋梁的評價指標分析表明，文中各類型大懸臂蓋梁均滿足設計荷載和重載荷載下的適用性要求。
[Abstract]:In the urban bridge construction, the application of the large cantilever cover beam is increasing day by day. The large cantilever cover beam is often matched with the streamline piers, the shape is graceful and the shape is smooth. Because of the large cantilever structure, the internal system is complicated. There are still some problems in calculation analysis and design method which have not been fully understood and used effectively. It is of practical and economic significance to explore and study this kind of structure in depth. At the same time, with the rapid development of social economy, the types of vehicles in highway transportation in our country are increasingly complex, and the development trend of large and heavy vehicles is obvious. The load standard obtained from the previous traffic condition can no longer represent the vehicle load under the current heavy haul traffic. Based on the investigation data of Xuanping Fort near the bridge site, this paper studies the safety of large cantilever prestressed capping beam under the action of design load and heavy load. Based on the statistical analysis of the parameters in the vehicle load data, the load probability distribution of the sub-type of the measured road is obtained. The effect value of bridge structure under the existing investigation load is calculated and analyzed. Under the load of highway class I and investigation heavy duty vehicle, the safety factor of the cover beam's bearing capacity is calculated, and the stress state of the cover beam is analyzed. Based on the solid analysis of Midas Civil and MIDAS FEA, it is suggested that the safety factor of bearing capacity and the compressive stress reserve of the most unfavorable section can be used as indexes for evaluating the safety of each type of capping beam. The calculation results of Midas Civil model show that the safety factor of cover beam of overcast piers is higher than that of vertical piers, the safety factors of all types of cover beams are higher under highway class I load, and the safety factor of cover beams of Y type pier is still higher under heavy load. The safety factor of vertical pier is still greater than 1, but its value is relatively small. The most unfavorable section of cover beam of vertical pier is located in the consolidation area of pier beam, and the position is slightly different. The corresponding sections have a certain compressive stress reserve, in which the minimum compressive stress Midas Civil model under heavy load is -2.55 MPA MIDAS FEA and -4.01 MPa. Through the analysis of the evaluation index of the typical cover beam, it is shown that each type of large cantilever cover beam in this paper meets the requirements of applicability under the design load and the heavy load.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U445.4;U446

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