本文選題：多塔斜拉橋 + 拉索�。� 參考：《長(zhǎng)安大學(xué)》2015年碩士論文

【摘要】：斜拉橋因其美觀的造型和較強(qiáng)的跨越能力,成為倍受現(xiàn)代設(shè)計(jì)師們青睞的一種橋型。作為斜拉橋關(guān)鍵部件的斜拉索,具有質(zhì)量小,阻尼低和柔度大的特點(diǎn),在風(fēng)荷載、車輛荷載等作用下斜拉索容易發(fā)生大幅度的振動(dòng)。拉索的振動(dòng)容易加速拉索的疲勞,最終導(dǎo)致拉索的破壞,直接影響橋梁的使用安全。因此,對(duì)斜拉索振動(dòng)特性的研究已經(jīng)成為斜拉橋設(shè)計(jì)的一個(gè)重要環(huán)節(jié)。由于多塔斜拉橋剛度不足,自身容易發(fā)生振動(dòng)現(xiàn)象,同時(shí)也易導(dǎo)致拉索的共振,所以如何提高多塔斜拉橋剛度已經(jīng)成為當(dāng)今橋梁建設(shè)領(lǐng)域的熱議話題之一。為了研究多塔斜拉橋剛度對(duì)拉索振動(dòng)的影響程度,本文首先建立了不同主梁剛度、橋塔剛度的有限元模型,討論剛度對(duì)于成橋動(dòng)力特性的影響。接著在建立了三維空間內(nèi)的拉索面內(nèi)-外-橋面耦合振動(dòng)模型,得到了拉索面內(nèi)-外-橋面耦合振動(dòng)方程組,采用多尺度法分析了拉索面內(nèi)-外-橋面耦合振動(dòng)特性。最后,通過(guò)計(jì)算邊塔拉索的面內(nèi)外固有頻率,與不同工況成橋的頻率進(jìn)行對(duì)比,分析可能發(fā)生大幅共振的拉索以及其面內(nèi)外的振動(dòng)特性。結(jié)果表明,多塔斜拉橋主梁剛度對(duì)于拉索發(fā)生面內(nèi)外共振的可能都有一定的影響,對(duì)面內(nèi)共振振幅影響大,而橋塔的剛度則對(duì)共振幅值影響很小,成橋的整體剛度則對(duì)拉索振動(dòng)發(fā)生的可能影響強(qiáng)烈。
[Abstract]:Because of its beautiful shape and strong span ability, cable-stayed bridge has become a bridge type favored by modern designers. As a key component of a cable-stayed bridge, the cable has the characteristics of low mass, low damping and large flexibility. Under the action of wind load and vehicle load, the cable-stayed cable is easy to vibrate in a large amplitude. The vibration of cable accelerates the fatigue of the cable and leads to the damage of the cable, which directly affects the safety of the bridge. Therefore, the study of cable vibration characteristics has become an important link in the design of cable-stayed bridge. Due to the lack of stiffness of multi-tower cable-stayed bridge, it is easy to vibrate itself and lead to the resonance of cable, so how to improve the stiffness of multi-tower cable-stayed bridge has become one of the hot topics in the field of bridge construction. In order to study the influence of multi-tower cable-stayed bridge stiffness on cable vibration, the finite element model of different main beam stiffness and bridge tower stiffness is established in this paper, and the influence of stiffness on the dynamic characteristics of the bridge is discussed. Then, the coupling vibration model of cable plane and external bridge deck in three dimensional space is established, and the coupling vibration equations between cable plane and external bridge deck are obtained. The coupling vibration characteristics of cable plane and external bridge deck are analyzed by using multi-scale method. Finally, by calculating the natural frequencies in and out of plane and comparing with the frequencies of the bridge under different working conditions, the vibration characteristics of the cables which may have large resonance and the vibration inside and outside the plane are analyzed. The results show that the stiffness of the main girder of the multi-tower cable-stayed bridge may have a certain effect on the in-plane resonance of the cable, and the amplitude of the resonance on the opposite side has a great effect, while the stiffness of the tower has little effect on the co-amplitude. The overall stiffness of the bridge may have a strong effect on the vibration of the cable.
【學(xué)位授予單位】：長(zhǎng)安大學(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 喻梅;李喬;廖海黎;;多塔斜拉橋的剛度配置[J];四川建筑科學(xué)研究;2010年04期

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本文編號(hào)：1921258