發(fā)布時(shí)間：2019-05-06 09:17

【摘要】：隨著經(jīng)濟(jì)的高速發(fā)展，我國交通的現(xiàn)代化建設(shè)也如日中天，橋梁建設(shè)技術(shù)也得到了不斷的發(fā)展，進(jìn)而涌現(xiàn)出了一大批新型的橋梁結(jié)構(gòu)形式，橋梁的橫向?qū)挾纫苍诓粩嘣黾�，因此，對工程設(shè)計(jì)提出了更高的要求。大懸臂的單箱多室寬箱梁截面是目前橋梁中廣泛采用的一種截面形式，尤其是在城市快速主干道等公路橋梁中。它具有優(yōu)良的結(jié)構(gòu)受力性能，但這種橋梁具有腹板間距大、橫向翼緣寬、箱壁薄等特點(diǎn)，在對其進(jìn)行結(jié)構(gòu)設(shè)計(jì)時(shí)，薄壁箱梁結(jié)構(gòu)的受力性能通常較為復(fù)雜，截面除了產(chǎn)生剪力之外，還伴隨著產(chǎn)生扭轉(zhuǎn)翹曲、畸變等作用。鑒于單箱多室寬箱梁的特殊性，現(xiàn)有的單箱單室箱梁理論已無法對其進(jìn)行有效計(jì)算，因此有必要進(jìn)一步研究，找到一種合適單箱多室寬箱梁的使用計(jì)算方法。 對分析寬箱梁、斜交橋和彎橋等橋梁結(jié)構(gòu)，梁格法是目前設(shè)計(jì)和科研中常采用的一種頗為有效的橋梁結(jié)構(gòu)空間分析方法，其特點(diǎn)是容易掌握，且對設(shè)計(jì)能夠保證足夠的精度，其中采用比較多的方法是剪力—柔性梁格法。其通過建立的等效梁格體系來模擬橋梁上部結(jié)構(gòu)，具有適用條件廣、計(jì)算效率高、精度合理以及輸出合乎現(xiàn)行公路橋涵設(shè)計(jì)規(guī)范等優(yōu)點(diǎn)，在今后實(shí)際工程中將得到更為廣泛的應(yīng)用。 本文首先簡述了寬箱梁橋的國內(nèi)外發(fā)展，以及針對寬箱梁的研究方法，討論了各自的適用范圍和優(yōu)缺點(diǎn)，闡明了梁格法是分析寬箱梁的一種頗為有效的橋梁結(jié)構(gòu)空間分析方法的思想；然后介紹了空間梁格的有限元單元分析法，空間梁單元的每個(gè)結(jié)點(diǎn)考慮6個(gè)自由度；又著重探討用梁格法對多室寬箱梁結(jié)構(gòu)進(jìn)行網(wǎng)格化分的基本方法和梁格剛度的取值問題，以及對梁格法的幾個(gè)關(guān)鍵問題進(jìn)行了研究對比，同時(shí)也探討一種截面縱向劃分的計(jì)算方法；最后以一座實(shí)際的混凝土連續(xù)寬箱梁橋靜載試驗(yàn)為工程背景，，用有限元軟件Midas/Civil對其建立了梁格法模型，并用Midas/FEA建立的實(shí)體單元模型驗(yàn)證了梁格法模型的剛度取值合理性，最后比較分析各靜載試驗(yàn)工況數(shù)據(jù)與梁格模型分析數(shù)據(jù)結(jié)果。 通過分析發(fā)現(xiàn)，梁格法模型在一定程度上可以反映實(shí)際橋梁結(jié)構(gòu)的受力特點(diǎn)，體現(xiàn)了梁格法概念清晰、便于計(jì)算的顯著特點(diǎn)，是分析寬箱梁橋的一種有效方法，具有工程實(shí)際意義，也為進(jìn)一步完善箱梁橋結(jié)構(gòu)分析程序奠定了基礎(chǔ)。
[Abstract]:With the rapid development of economy, the modernization of transportation in our country is becoming more and more important, the bridge construction technology has also been developed continuously, and a large number of new bridge structure forms have emerged, and the transverse width of the bridge has also been increasing constantly. Therefore, higher requirements for engineering design are put forward. The section of single-box multi-chamber wide box girder with large cantilever is widely used in bridges at present, especially in highway bridges such as urban rapid trunk roads. It has excellent structural performance, but the bridge has the characteristics of large web spacing, wide transverse flange, thin box wall and so on. In the structural design, the mechanical performance of thin-walled box girder structure is usually more complex, and the bridge has many advantages, such as large web spacing, wide transverse flange, thin box wall and so on. In addition to the shear force, the cross section is accompanied by torsional warping, distortion and so on. In view of the particularity of single-box multi-chamber wide box girder, the existing theory of single-box single-chamber box girder can no longer be used to calculate it effectively. Therefore, it is necessary to further study and find a suitable calculation method for single-box multi-chamber wide box girder. For the analysis of bridge structures such as wide box girder, skew bridge and curved bridge, beam lattice method is a very effective spatial analysis method of bridge structure, which is often used in design and scientific research. Its characteristic is that it is easy to master, and it can guarantee enough precision for design. The shear-flexible beam grid method is widely used. The equivalent beam grid system is used to simulate the bridge superstructure. It has the advantages of wide applicable conditions, high calculation efficiency, reasonable precision and output in accordance with the current design code of highway bridges and culverts, and so on. It will be widely used in practical engineering in the future. In this paper, the development of wide box girder bridge at home and abroad and the research methods of wide box girder are briefly introduced, and the application scope, advantages and disadvantages of each are discussed. This paper expounds the idea that the beam lattice method is an effective spatial analysis method for the analysis of wide box girders. Then the finite element analysis method of spatial beam lattice is introduced. Each node of spatial beam element considers 6 degrees of freedom. In addition, the basic method of meshing the multi-room wide box girder structure and the value of the stiffness of the beam lattice are also discussed, and some key problems of the beam grid method are also studied and compared. At the same time, a calculation method of longitudinal division of cross-section is also discussed. Finally, based on the actual static load test of a concrete continuous wide box girder bridge, the beam lattice method model is established by using the finite element software Midas/Civil. The stiffness of the beam-grid model is verified by the solid element model established by Midas/FEA. Finally, the results of the static load test data and the beam-grid model analysis data are compared and analyzed. Through the analysis, it is found that the beam lattice model can reflect the stress characteristics of the actual bridge structure to a certain extent, and it is an effective method to analyze the wide box girder bridge, which reflects the clear concept of the beam lattice method and is convenient for calculation. It is of practical engineering significance and lays a foundation for further perfecting the program of structural analysis of box girder bridges.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U448.213

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