多跨先简支后连续斜交小箱梁桥受力行为研究

发布时间：2018-01-05 23:18

  本文关键词：多跨先简支后连续斜交小箱梁桥受力行为研究　出处：《长沙理工大学》2014年硕士论文　论文类型：学位论文

  更多相关文章： 先简支后连续斜交小箱梁 斜交角度 有限元 汽车荷载 温度荷载 力学性能 横向分布系数 荷载试验

【摘要】：随着我国交通事业的不断发展,桥梁建设也进入鼎盛时期。由于施工工艺的不断进步,可选择的桥型也日趋多样化。在道路选线时,由于要适应地形、地质等需要,以及考虑到行车舒适性、施工周期短、人力消耗小、建筑材料省、经济效益高等优点,先简支后连续斜交小箱梁桥在中、小跨径的桥梁中得到了越来越多的应用。本文通过查阅大量国内外文献,阐述了先简支后连续斜交小箱梁桥的发展历程以及研究情况,并以湖南省长沙至湘潭高速公路(复线)金州分离式立交桥为工程背景,研究多跨先简支后连续小箱梁桥改变斜交角度情况下的力学性能影响,主要研究内容与成果有如下几点：(1)针对多跨先简支后连续斜交小箱梁桥,运用有限元软件Midas/Civil建立多个梁格模型。研究汽车荷载作用下不同斜交角度(060°)主梁的结构效应,主要结论如下：主梁跨中以及支座处弯矩、应力随斜交角度的增大而减小；主梁跨中扭矩随斜交角度的增大而增大,位移随斜交角度的增大而减小。(2)针对四跨先简支后连续斜交小箱梁桥,运用有限元软件Midas/Civil建立多个梁格模型。研究温度荷载作用下不同斜交角度(0600)主梁的力学性能,主要结论如下：主梁边跨跨中弯矩、应力、位移随斜交角度的增大先减小后增大,中跨跨中以及边、中跨支座弯矩、应力、位移则随斜交角度的增大先增大后减小；主梁两中跨支座弯矩、应力以及跨中扭矩均随斜交角度的增大而增大。(3)针对四跨先简支后连续斜交小箱梁桥,运用有限元软件ANSYS建立多个实体模型。研究集中力作用下,不同斜交角度(060°)跨中截面主梁荷载横向分布变化规律,并与实桥荷载试验结果进行对比相互验证,主要结果如下：主梁荷载横向分布系数在斜交角度为0°～10°时可按正桥考虑；当斜交角度大于10°时,由于弯扭耦合作用显著,各主梁跨中荷载横向分布系数明显减小。同时荷载试验表明,各主梁跨中的荷载横向分布系数实测值与有限元理论值比较相近,且两者变化趋势基本相符,各主梁横向联系紧密,荷载分配达到设计时的预期效果。
[Abstract]:With the continuous development of our country's transportation industry, bridge construction has also entered the peak period. Due to the continuous progress of construction technology, the choice of bridge type is becoming more and more diverse. In the road route selection, due to the need to adapt to the terrain. Geological needs, and considering the advantages of driving comfort, short construction period, small manpower consumption, low construction materials, high economic benefits, etc., the simple support and then the continuous skew small box girder bridge is in the middle. Small span bridges have been used more and more. Through consulting a large number of domestic and foreign literature, this paper expounds the development history and research situation of small box girder bridge with simple support and continuous skew beam. Based on the engineering background of Jinzhou separated overpass of Changsha to Xiangtan Expressway (double Line) in Hunan Province, the influence of mechanical properties of multi-span bridge with simple support and continuous small box girder bridge under the condition of changing skew angle is studied. The main research contents and results are as follows: 1) for multi-span simple support and then continuous skew small box girder bridge. The finite element software Midas/Civil is used to establish several girder lattice models. The structural effects of the main beam with different skew angles (0 60 掳) under vehicle load are studied. The main conclusions are as follows: the bending moment and stress decrease with the increase of the oblique angle. The middle torque of the main girder increases with the increase of the skew angle, and the displacement decreases with the increase of the skew angle. The finite element software Midas/Civil is used to establish several girder lattice models. The mechanical properties of the main beam with different skew angles under temperature load are studied. The main conclusions are as follows: the moment, stress and displacement of the side span of the main beam first decrease and then increase with the increase of the angle of skew, and the moment and stress of the middle span and the side and the middle span of the support. The displacement increases first and then decreases with the increase of oblique angle. The moment, stress and torque of the two middle spans of the main girder are increased with the increase of the angle of skew. 3) for the four-span bridge with simple support and then continuous skew box girder. The finite element software ANSYS is used to establish several solid models. The lateral distribution of load on the main beam with different skew angle is studied under the action of concentrated force. The main results are as follows: the transverse load distribution coefficient of the main beam can be considered according to the straight bridge when the angle of oblique intersection is 0 掳~ 10 掳; When the angle of skew is greater than 10 掳, the transverse load distribution coefficient of each main beam decreases obviously because of the significant coupling between bending and torsion. The measured values of load transverse distribution coefficient in the span of each main beam are close to the theoretical value of the finite element method, and the variation trend is basically consistent with each other. The transverse connection of each main beam is close, and the load distribution achieves the expected effect in the design.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441;U448.213
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本文编号：1385291