發(fā)布時(shí)間：2018-05-02 14:04

  本文選題：斜拉橋 + 橋面板��； 參考：《重慶交通大學(xué)》2015年碩士論文

【摘要】：斜拉橋又稱斜張橋,屬于組合體系橋梁,是由承壓的塔、受拉的索和承彎的梁體組合起來(lái)的一種結(jié)構(gòu)體系。鋼桁斜拉橋由正交異性鋼橋面板和鋼桁架組成主梁,由于其特殊形式的主梁空間結(jié)構(gòu)適應(yīng)布置雙層橋面的需要,且其抗彎剛度大,綜合高效性能比較突出,在公鐵兩用斜拉橋中獲得廣泛應(yīng)用。但目前關(guān)于這種結(jié)構(gòu)型式橋梁力學(xué)研究可供參考的文獻(xiàn)極少,對(duì)于考慮橋面板與鋼桁架共同作用時(shí)橋梁的力學(xué)特性尚不明朗。為全面了解其受力特性,本文對(duì)此進(jìn)行了研究。本文以東水門大橋?yàn)楣こ瘫尘?圍繞鋼桁斜拉橋進(jìn)行了三個(gè)方面的論述。第一部分主要介紹了斜拉橋和鋼桁斜拉橋的發(fā)展歷史以及目前的研究手段和方法,第二部分主要介紹了運(yùn)用Midas Civil軟件對(duì)全橋進(jìn)行建模的過(guò)程,分析了建模過(guò)程中所需的注意問(wèn)題,如何正確選取結(jié)構(gòu)單元屬性,構(gòu)件連接問(wèn)題以及大橋邊界條件、荷載布置等。第三部分是整個(gè)論文的核心部分,在前期建模過(guò)程中,通過(guò)橋面板與鋼桁架兩種不同的連接方式,模擬橋面板和鋼桁架是否共同作用。再對(duì)比分析大橋在成橋恒載作用以及運(yùn)營(yíng)狀態(tài)兩種不同的荷載工況下,大橋上弦桿、下弦桿、中縱梁、橋面板、斜腹桿和斜拉索的受力情況,以及大橋在恒載作用下的振型、自振頻率和活載作用下的豎向撓度和豎向轉(zhuǎn)角的差異,并得到以下研究成果:①鋼桁梁主桁桿件在考慮橋面板和鋼桁架共同作用時(shí)的內(nèi)力要較不考慮共同作用時(shí)小,橋面板內(nèi)力要較之大,研究表明橋面板不僅作為支承汽車輪載的結(jié)構(gòu),而且也作為主梁的一部分分擔(dān)主梁的內(nèi)力。②斜腹桿和斜拉索在考慮是否共同作用時(shí)對(duì)內(nèi)力幾乎沒有影響。③在考慮橋面板和鋼桁架共同作用的情況下大橋自振頻率要比不考慮共同作用大,活載作用下的豎向撓度和豎向轉(zhuǎn)角要比后者小,研究表明橋面板和鋼桁架共同作用提高了大橋的剛度,有利于大橋受力。
[Abstract]:Cable-stayed bridge, also known as skew bridge, is a kind of structural system which is composed of compression tower, tension cable and curved beam. Steel truss cable-stayed bridge is composed of orthotropic steel bridge face slab and steel truss. Due to its special form of space structure of main beam to meet the needs of the arrangement of double-deck bridge deck, and its bending stiffness is large, the comprehensive and efficient performance is relatively outstanding. It is widely used in the cable-stayed bridge. However, there are few references on the mechanical research of this type of bridge, and the mechanical properties of the bridge considering the interaction of deck slab and steel truss are not clear. In order to fully understand its mechanical characteristics, this paper has carried on the research. In this paper, three aspects of steel truss cable-stayed bridge are discussed. The first part mainly introduces the development history of cable-stayed bridge and steel truss cable-stayed bridge, and the current research methods and methods. The second part mainly introduces the process of modeling the whole bridge by using Midas Civil software. The attention problems in modeling process are analyzed, and how to correctly select the properties of structural elements, the connection problem of members, the boundary conditions of the bridge, the load arrangement and so on are analyzed. The third part is the core part of the whole paper. In the early modeling process, the bridge deck slab and steel truss are connected in two different ways to simulate whether the bridge deck slab and steel truss work together. Then, under two different load conditions, the upper chord, the lower chord, the middle longitudinal beam, the deck slab, the inclined web bar and the stay cable, and the vibration mode of the bridge under dead load, the bridge is subjected to dead load and operation. The difference between the vertical deflection and the vertical rotation angle under the action of natural vibration frequency and live load is obtained. The following research results are obtained: the internal force of the main truss member of the steel truss beam: 1 is smaller when considering the joint action of the bridge deck plate and the steel truss structure than when the joint action is not taken into account. The internal force of the bridge deck is larger than that of the bridge deck. The research shows that the bridge deck is not only used as the structure supporting the wheel load of the vehicle, And as a part of the main beam, the internal force .2 the inclined web bar and the stay cable have little effect on the internal force when considering whether or not to act together. 3. 3. When considering the joint action of the deck slab and the steel truss, the bridge natural vibration is hardly affected. More often than not, The vertical deflection and vertical rotation angle under live load are smaller than that of the latter. The research shows that the joint action of deck slab and steel truss improves the stiffness of the bridge and is beneficial to the bridge force.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U448.27

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 李國(guó)豪;桁梁橋空間內(nèi)力、穩(wěn)定、振動(dòng)分析[J];中國(guó)科學(xué);1978年06期

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本文編號(hào)：1834214