【摘要】：下承式拱橋在我國發(fā)展應(yīng)用多年，設(shè)計理論、施工工藝都相當成熟，但隨著交通量、汽車載重的不斷增加，橋梁運營能力受到了前所未有的考驗。近年來拱橋吊桿斷裂事故頻發(fā)，下承式拱橋的安全問題引起整個橋梁界的關(guān)注。本文從橋面系結(jié)構(gòu)形式的角度，探究不同橋面系形式對下承式拱橋受力性能的影響。 本文利用有限元軟件ANSYS建立下承式拱橋模型，通過添加縱梁的方式改變橋面系結(jié)構(gòu)形式，做了如下工作： 首先對全橋結(jié)構(gòu)在恒載、滿布荷載作用時，吊桿受力的規(guī)律進行了初步評價。然后比較了不同橋面系吊桿軸力影響線數(shù)值大小。再沿順橋向不同位置作用車輛荷載，考察吊桿軸力值。然后通過改變縱梁截面尺寸，討論縱梁剛度對吊桿受力的影響。最后分析了荷載作用位置吊桿失效后，附近吊桿的受力情況。 然后選擇橋頭、四分之一跨徑和跨中截面，分別在這三個截面上沿橫向不同車道位置布置車輛荷載，考察不同橋面系中吊桿軸力值和縱梁彎矩、剪力大小，，并分析了橫梁截面處一對吊桿軸力分配的規(guī)律。然后討論了荷載在兩片拱肋上的橫向分布情況，并與傳統(tǒng)的杠桿原理法計算橫向分布系數(shù)進行比較。 最后建立了幾何尺寸與下承式拱橋相同的懸索橋模型，分析了懸索橋吊桿軸力影響線大小，與拱橋進行了對比，考察不同端部約束條件下吊桿受力情況。
[Abstract]:With the development and application of through arch bridge in our country for many years, the design theory and construction technology are quite mature, but with the increasing traffic volume and vehicle load, the bridge operation ability has been tested unprecedentedly. From the perspective of structural form, the influence of different deck systems on the mechanical behavior of a through arch bridge is explored.
In this paper, the finite element software ANSYS is used to establish the model of through arch bridge, and the deck structure is changed by adding longitudinal beams.
Firstly, the force distribution of suspenders under dead load and full load is preliminarily evaluated. Then the influence lines of axial force of suspenders on different deck systems are compared. Then the axial force of suspenders is investigated by vehicle loads acting along different positions along the bridge. Then the force distribution of suspenders is discussed by changing the section size of longitudinal beams. Finally, it analyzes the stress condition of the suspender after the failure of the boom.
Then, the axle force of suspender, the bending moment of longitudinal beam and the shear force of longitudinal beam in different deck systems are investigated. The distribution law of axial force of a pair of suspenders at the cross section is analyzed. Then the load on two arch ribs is discussed. The lateral distribution is calculated and compared with the traditional lever principle.
Finally, a suspension bridge model with the same geometric size as the through arch bridge is established, and the influence line of suspension rod axial force is analyzed, and compared with the arch bridge.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U448.22;U441

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本文編號：2211511