本文選題：單箱多室 + 寬箱梁�。� 參考：《重慶交通大學(xué)》2014年碩士論文

【摘要】：隨著道路路幅寬度日益加大，橋梁寬度也隨之增大，在城市的中小跨徑橋梁中，單箱多室截面的箱梁橋使用越來越多。此類橋梁截面特點是腹板間距小，但是箱室數(shù)量較多，結(jié)構(gòu)的受力性能及特點較為復(fù)雜，沒有專門針對單箱多室寬箱梁的實用計算方法。目前在多室寬箱梁中使用較多的方法為梁格法和橫向分布法。研究顯示梁格法在多室寬箱梁中的使用情況較好，但橫向分布法會產(chǎn)生較大誤差，因此有必要對現(xiàn)有的荷載橫向分布計算方法進(jìn)行改進(jìn)，，使其適合單箱多室寬箱梁的橫向分布計算。 首先，利用通用有限元軟件分析了多室寬箱梁的彎扭受力特性。以不同箱室數(shù)量、不同寬跨比的單箱多室懸臂寬箱梁為例，分別建立了扭轉(zhuǎn)荷載和偏心荷載作用下的實體有限元模型，比較分析了箱室剪力流分布和橫截面豎向位移沿橫向的分布情況，結(jié)果表明扭轉(zhuǎn)荷載作用下的剪力流分布與單箱單室箱梁或?qū)捒绫容^小的普通多室箱梁基本一致，偏心荷載作用下的剪力流分布主要由扭轉(zhuǎn)剪力流和彎曲剪力流組成，因此偏心荷載作用下的計算分析可由整體豎向位移和整體扭轉(zhuǎn)兩部分效應(yīng)分別計算疊加。 其次，在計算多梁式橋梁橫向分布系數(shù)剛接梁法的基礎(chǔ)上，提出適用于多室寬箱梁空間實用計算方法的修正剛接梁法。將箱梁沿腹板間的頂?shù)装迩虚_成各片工字梁組成的結(jié)構(gòu)，切口處以贅余力代替，建立力法方程組通過求解矩陣方程即可得出所有贅余力。介于剛接梁法求解過程較為繁瑣，本文編寫了贅余力求解程序，并提出了修正剛接梁法計算步驟及要點。 最后，通過計算實例，建立有限元實體單元模型，驗證本文所推導(dǎo)的修正剛接梁法，討論了其適用性和精確性。此方法具有較好的實際應(yīng)用價值，對單箱多室寬箱梁的計算有一定的幫助，也為后續(xù)深入研究提供依據(jù)。
[Abstract]:With the increasing road width, the bridge width is also increasing. In the medium and small span bridges in the city, the box girder bridge with single box and multi-room section is used more and more. The cross-section of this kind of bridge is characterized by small web spacing, but the number of box chambers is large, and the mechanical properties and characteristics of the structure are more complicated. There is no practical calculation method for single box and multi-chamber wide box girder. At present, many methods are used in multi-chamber wide box girder such as beam lattice method and transverse distribution method. The research shows that the beam lattice method is in good use in the multi-chamber wide box girder, but the transverse distribution method will cause great errors, so it is necessary to improve the existing calculation method of transverse distribution of load. It is suitable for the calculation of transverse distribution of single box and multi-chamber wide box girder. Firstly, the bending and torsional behavior of multi-chamber wide box girder is analyzed by using the general finite element software. The solid finite element models of a single box multi-chamber cantilever wide box girder with different number of chambers and different width-span ratios are established under torsional load and eccentric load respectively. The shear flow distribution of the box chamber and the vertical displacement of the cross section along the transverse direction are compared and analyzed. The results show that the shear flow distribution under the torsional load is basically the same as that of the single box girder or the common multi-chamber box girder with small width span. The distribution of shear flow under eccentric load is mainly composed of torsional shear flow and bending shear flow, so the calculation and analysis under eccentric load can be calculated and superimposed by the integral vertical displacement and the global torsional effect respectively. Secondly, on the basis of calculating the transverse distribution coefficient of multi-beam bridges, a modified rigid-connected beam method is proposed, which is suitable for the spatial calculation of multi-chamber wide box girder. The box girder is cut along the top and bottom plate between the web plates into a structure composed of each I-beam, and the incision is replaced by Yu Li. The equations of force method can be obtained by solving the matrix equation. In view of the complicated process of solving the rigid-connected beam method, this paper compiles the residual solution program, and puts forward the calculation steps and key points of the modified rigid-connected beam method. Finally, a finite element solid element model is established to verify the modified rigid beam method derived in this paper, and its applicability and accuracy are discussed. This method has good practical application value, which is helpful to the calculation of single box and multi-chamber wide box girder, and also provides the basis for further research.
【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】：U448.213;U441

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相關(guān)期刊論文 前2條

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