本文選題：V型拱橋 + 寬箱梁�。� 參考：《西南交通大學(xué)》2014年碩士論文

【摘要】：青白江大橋是一座跨徑布置為40m+100m+40m的V型外傾式拱橋,其橋面寬度達(dá)到54m。復(fù)雜的空間異型結(jié)構(gòu)體系和超寬橋面構(gòu)造加大橋梁結(jié)構(gòu)受力分析的難度。僅通過(guò)以梁?jiǎn)卧⒂邢拊Ｐ瓦M(jìn)行計(jì)算,結(jié)果精度不足、不能很好的體現(xiàn)橫向變形與內(nèi)力分布；而使用實(shí)體有限元進(jìn)行全橋建模分析計(jì)算雖然能滿(mǎn)足計(jì)算精度要求但工作量過(guò)大,且耗時(shí)長(zhǎng)。因此,考慮到橋梁主梁的大寬跨比,應(yīng)該采用梁格法進(jìn)行計(jì)算,這樣計(jì)算量相對(duì)較小而且計(jì)算精度相對(duì)較高。從橋梁的拱圈位置和吊桿的位置分布來(lái)判斷,其橫向受力分析十分重要,關(guān)系到體系的平衡。因此本文認(rèn)為在建立有限元計(jì)算模型對(duì)橋梁進(jìn)行分析時(shí)應(yīng)當(dāng)充分考慮主梁的橫向剛度對(duì)橋梁結(jié)構(gòu)體系造成的影響。而常用的梁格法在寬箱梁的應(yīng)用上并不十分完善,未能考慮到橫坡、寬翼緣等因素造成的影響,所以應(yīng)對(duì)梁格法在寬箱梁的應(yīng)用進(jìn)行改進(jìn),以提高橋梁的計(jì)算精度。本文一共分五章。第一章簡(jiǎn)要介紹了梁拱組合橋梁的發(fā)展歷程及設(shè)計(jì)計(jì)算方法；第二章詳細(xì)闡述了剪力-柔性梁格法理論；第三章利用有限元軟件ANSYS與MIDAS/CIVIL作為計(jì)算工具建立了以青白江大橋主跨主梁為研究對(duì)象的實(shí)體有限元模型和梁格法模型。通過(guò)對(duì)計(jì)算結(jié)果的對(duì)比分析,對(duì)一般的梁格劃分和剛度取值方法進(jìn)行改進(jìn)。然后建立改進(jìn)后的梁格法模型,與改進(jìn)前的模型進(jìn)行結(jié)果對(duì)比；第四章運(yùn)用改進(jìn)前和改進(jìn)后的梁格法對(duì)青白江大橋建立了整體有限元模型,并對(duì)成橋的靜力和動(dòng)力等部分結(jié)果進(jìn)行了對(duì)比分析；最后本文介紹以剛性連續(xù)梁法、剛性吊桿法和影響矩陣目標(biāo)函數(shù)優(yōu)化法對(duì)拱橋的吊桿合理張拉力進(jìn)行了探討計(jì)算。本文在改善寬箱梁的計(jì)算方法和對(duì)合理張拉力計(jì)算方法的研究,為同類(lèi)型大橋的設(shè)計(jì)及優(yōu)化提供了一定的參考依據(jù)。
[Abstract]:Qingbai River Bridge is a V-type extroverted arch bridge with a span of 40m, 100m and 40m, and its deck width reaches 54m. The complicated spatial irregular structure system and the super wide deck structure make it more difficult to analyze the force of the bridge structure. Only by establishing finite element model of beam element, the accuracy of the result is insufficient, and the transverse deformation and internal force distribution can not be reflected well. The whole bridge modeling and calculation by using solid finite element method can meet the requirement of calculation precision, but the workload is too large and the time consuming is long. Therefore, in view of the large width-span ratio of the main girder of the bridge, the beam lattice method should be used to calculate, so the calculation cost is relatively small and the calculation accuracy is relatively high. Judging from the position of the arch ring and the position of the suspender, the lateral force analysis is very important, which is related to the balance of the system. Therefore, the influence of the transverse stiffness of the main beam on the bridge structure system should be fully considered when the finite element calculation model is established to analyze the bridge. However, the commonly used beam lattice method is not perfect in the application of wide box girder, and has not taken into account the influence of transverse slope and wide flange, so the application of beam lattice method in wide box girder should be improved in order to improve the accuracy of bridge calculation. This paper is divided into five chapters. The first chapter briefly introduces the development course and the design calculation method of the beam-arch composite bridge, the second chapter elaborates the theory of shear-flexible beam method in detail. In the third chapter, the solid finite element model and the beam method model are established by using the finite element software ANSYS and MIDAS/CIVIL as the calculation tools, taking the main girder of Qingbai River Bridge as the research object. Through the comparison and analysis of the calculation results, the general method of beam grid division and stiffness selection is improved. Then the improved beam method model is established, and the results are compared with the improved model. In the fourth chapter, the whole finite element model of Qingbai River Bridge is established by using the improved beam method and the improved beam lattice method. The static and dynamic results of the bridge are compared and analyzed. Finally, the rational tension of arch bridge is calculated by rigid continuous beam method, rigid suspender method and objective function optimization method of influence matrix. In this paper, the calculation method of wide box girder and the calculation method of reasonable tension force are improved, which provides a certain reference for the design and optimization of the bridge of the same type.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U442

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本文編號(hào)：1961866