本文關鍵詞：多跨先簡支后連續(xù)斜交小箱梁橋受力行為研究　出處：《長沙理工大學》2014年碩士論文　論文類型：學位論文

  更多相關文章： 先簡支后連續(xù)斜交小箱梁 斜交角度 有限元 汽車荷載 溫度荷載 力學性能 橫向分布系數(shù) 荷載試驗

【摘要】：隨著我國交通事業(yè)的不斷發(fā)展,橋梁建設也進入鼎盛時期。由于施工工藝的不斷進步,可選擇的橋型也日趨多樣化。在道路選線時,由于要適應地形、地質等需要,以及考慮到行車舒適性、施工周期短、人力消耗小、建筑材料省、經(jīng)濟效益高等優(yōu)點,先簡支后連續(xù)斜交小箱梁橋在中、小跨徑的橋梁中得到了越來越多的應用。本文通過查閱大量國內外文獻,闡述了先簡支后連續(xù)斜交小箱梁橋的發(fā)展歷程以及研究情況,并以湖南省長沙至湘潭高速公路(復線)金州分離式立交橋為工程背景,研究多跨先簡支后連續(xù)小箱梁橋改變斜交角度情況下的力學性能影響,主要研究內容與成果有如下幾點：(1)針對多跨先簡支后連續(xù)斜交小箱梁橋,運用有限元軟件Midas/Civil建立多個梁格模型。研究汽車荷載作用下不同斜交角度(060°)主梁的結構效應,主要結論如下：主梁跨中以及支座處彎矩、應力隨斜交角度的增大而減�。恢髁嚎缰信ぞ仉S斜交角度的增大而增大,位移隨斜交角度的增大而減小。(2)針對四跨先簡支后連續(xù)斜交小箱梁橋,運用有限元軟件Midas/Civil建立多個梁格模型。研究溫度荷載作用下不同斜交角度(0600)主梁的力學性能,主要結論如下：主梁邊跨跨中彎矩、應力、位移隨斜交角度的增大先減小后增大,中跨跨中以及邊、中跨支座彎矩、應力、位移則隨斜交角度的增大先增大后減��；主梁兩中跨支座彎矩、應力以及跨中扭矩均隨斜交角度的增大而增大。(3)針對四跨先簡支后連續(xù)斜交小箱梁橋,運用有限元軟件ANSYS建立多個實體模型。研究集中力作用下,不同斜交角度(060°)跨中截面主梁荷載橫向分布變化規(guī)律,并與實橋荷載試驗結果進行對比相互驗證,主要結果如下：主梁荷載橫向分布系數(shù)在斜交角度為0°～10°時可按正橋考慮；當斜交角度大于10°時,由于彎扭耦合作用顯著,各主梁跨中荷載橫向分布系數(shù)明顯減小。同時荷載試驗表明,各主梁跨中的荷載橫向分布系數(shù)實測值與有限元理論值比較相近,且兩者變化趨勢基本相符,各主梁橫向聯(lián)系緊密,荷載分配達到設計時的預期效果。
[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 擄) 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 擄~ 10 擄; When the angle of skew is greater than 10 擄, 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.
【學位授予單位】：長沙理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U441;U448.213
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本文編號：1385291