【摘要】：近年來(lái),隨著中國(guó)社會(huì)經(jīng)濟(jì)的高速發(fā)展,作為交通樞紐的大跨度橋梁迅速被修建�？v飄橋梁是大跨度橋梁設(shè)計(jì)中一種比較常見(jiàn)的結(jié)構(gòu)形式,該橋型的特點(diǎn)是縱向無(wú)約束,允許主梁縱向擺動(dòng),具有良好的耗能減振效果,但在地震荷載和車輛制動(dòng)力作用下會(huì)產(chǎn)生較大的梁端縱向位移,影響橋梁的正常使用,甚至導(dǎo)致落梁,因此有必要采取相應(yīng)的措施進(jìn)行控制。本文以佛山平勝大橋?yàn)楣こ瘫尘?分別進(jìn)行了車輛制動(dòng)力和地震荷載作用下基于彈性索和摩擦擺支座的減振(震)控制研究。主要研究?jī)?nèi)容如下： (1)應(yīng)用有限元軟件MIDAS,建立了佛山平勝大橋的空間有限元模型。動(dòng)力特性分析結(jié)果表明：縱飄橋梁結(jié)構(gòu)體系的固有頻率為0.0643Hz,縱向剛度小；彈性索和摩擦擺支座能夠有效的提高橋梁的縱向剛度。 (2)基于MIDAS模型,利用時(shí)程分析法,進(jìn)行了車輛制動(dòng)力作用下的減振控制研究。結(jié)果表明：在車輛制動(dòng)力作用下,彈性索對(duì)于主梁縱向位移的控制作用相當(dāng)顯著；同時(shí)對(duì)溫度和主跨滿布兩種正常運(yùn)營(yíng)狀態(tài)具有較好的適應(yīng)性。 (3)采用正交試驗(yàn)法對(duì)摩擦擺支座的參數(shù)進(jìn)行比選,并對(duì)參數(shù)優(yōu)選后的摩擦擺支座進(jìn)行了減震控制研究。結(jié)果表明,摩擦擺支座具有較好的減震控制效果,在平勝橋?qū)崢虿āl-Centro波、Taft波作用下,主梁梁端位移分別減小了26.75%、19.27%、36.46%。 (4)運(yùn)用ANSYS開(kāi)展了基于彈性索和摩擦擺支座的減震控制研究,結(jié)果表明：在地震荷載作用下對(duì)于主梁縱向位移的控制作用主要來(lái)自摩擦擺支座,為減小車輛制動(dòng)力作用下主梁縱向位移而設(shè)置的彈性索在地震荷載作用下預(yù)期被拉斷。
[Abstract]:In recent years, with the rapid development of social economy in China, the long-span bridge, as a transportation hub, has been built rapidly. Longitudinal floating bridge is a common structural form in the design of long-span bridge, which is characterized by longitudinal unconstrained, allowing the main beam to swing longitudinally, and has good energy dissipation effect. However, under the action of earthquake load and vehicle braking force, large longitudinal displacement of beam end will be produced, which will affect the normal use of bridge and even lead to beam falling, so it is necessary to take corresponding measures to control it. In this paper, based on the engineering background of Pingsheng Bridge in Foshan, the vibration reduction (earthquake) control based on elastic cable and friction pendulum bearing under vehicle braking force and earthquake load is studied respectively. The main contents are as follows: (1) the spatial finite element model of Foshan Pingsheng Bridge is established by using finite element software MIDAS,. The results of dynamic analysis show that the natural frequency of the longitudinal floating bridge system is 0.0643Hz, the longitudinal stiffness is small, and the elastic cable and friction pendulum support can effectively improve the longitudinal stiffness of the bridge. (2) based on MIDAS model and time-history analysis, the vibration control of vehicle under braking force is studied. The results show that the control effect of elastic cable on longitudinal displacement of main beam is quite remarkable under the action of vehicle braking force, and the elastic cable has good adaptability to two normal operating conditions: temperature and main span full distribution. (3) the parameters of the friction pendulum bearing are selected by orthogonal test method, and the damping control of the friction pendulum bearing after the optimization of the parameters is studied. The results show that the friction pendulum bearing has better seismic control effect. Under the action of the real bridge wave, El-Centro wave and Taft wave of Pingsheng Bridge, the displacement of the main beam end decreases by 26.75%, 19.27% and 36.46%, respectively. (4) the research of damping control based on elastic cable and friction pendulum bearing is carried out by using ANSYS. The results show that the control effect of longitudinal displacement of main beam under earthquake load mainly comes from friction pendulum support. The elastic cable set up to reduce the longitudinal displacement of the main beam under the action of vehicle braking force is expected to be broken under the action of earthquake load.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441.3

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