【摘要】：水中懸浮隧道（Submerged Floating Tunnel,簡(jiǎn)稱“SFT”），又名阿基米德橋，是跨越深水域的新交通方式。它固定在水面以下，借助浮力、張力腿拉力和自重懸浮在水底和兩岸，，以防浮出水面，橋頂距水面保持20米以上的距離，以便大噸位船只通行。一般由浮在水中一定深度的管狀結(jié)構(gòu)、錨固在水下基礎(chǔ)的錨固系統(tǒng)或水上的浮箱裝置及與兩岸相連的構(gòu)筑物組成。它是一種新的跨越海峽、大江湖泊、水道的交通結(jié)構(gòu)物。 在過(guò)去數(shù)年里，眾多科研工作者已經(jīng)對(duì)懸浮隧道管體、錨固系統(tǒng)、管體和錨索耦合模型的動(dòng)力響應(yīng)做了研究。很少有將將懸浮隧道簡(jiǎn)化成一個(gè)兩端支座處帶有彈簧和阻尼的彈性支撐梁來(lái)進(jìn)行研究。在此篇論文中，主要的研究工作集中于穩(wěn)定流中渦激振動(dòng)和移動(dòng)荷載作用下的彈性支撐的懸浮隧道的動(dòng)力響應(yīng)。在這個(gè)過(guò)程中，懸浮隧道被簡(jiǎn)化成一個(gè)簡(jiǎn)支彈性梁和一個(gè)具有彈簧和阻尼支撐的剛性梁的疊加。通過(guò)數(shù)值模擬來(lái)研究彈性支撐的彈簧剛度和阻尼，以及移動(dòng)荷載大小和移動(dòng)速度對(duì)懸浮隧道動(dòng)力特性的影響。 本文的主要具體的研究?jī)?nèi)容如下： (1)考慮均勻流中渦激振動(dòng)作用下，將懸浮隧道簡(jiǎn)化成一個(gè)兩端支座處帶有彈簧和阻尼的彈性支撐梁，建立懸浮隧道在渦激振動(dòng)作用下的結(jié)構(gòu)動(dòng)力方程。通過(guò)伽遼金法和模態(tài)疊加法求解方程，利用Matlab工具數(shù)值模擬得到了懸浮隧道的時(shí)程位移圖形。通過(guò)對(duì)懸浮隧道的時(shí)程位移圖形分析獲得渦激振動(dòng)作用下水中懸浮隧道管體的動(dòng)力特性，以彈性支撐的彈簧剛度和阻尼對(duì)其位移的影響作用。 (2)仍以管體系統(tǒng)為研究對(duì)象，建立了管體在移動(dòng)荷載作用下的的振動(dòng)模型。通過(guò)伽遼金法和模態(tài)疊加法求解系統(tǒng)的振動(dòng)微分方程，利用Matlab工具對(duì)懸浮隧道的位移進(jìn)行數(shù)值模擬，分析得出懸浮隧道在不同大小和不同速度荷載，以及彈性支撐的剛度和阻尼對(duì)其位移的影響。
[Abstract]:Underwater suspended Tunnel (Submerged Floating Tunnel,), also known as Archimedes Bridge, is a new mode of transportation across deep waters. It is fixed below the water surface, with the aid of buoyancy, tension leg pull force and weight suspended in the bottom and the banks, in case of surfacing, the top of the bridge keeps a distance of more than 20 meters from the water surface for the passage of large tonnage ships. Generally, it consists of pipe structure of certain depth, anchoring system of underwater foundation, floating box device and structure connected with both sides. It is a new traffic structure across straits, rivers, lakes and waterways. In the past few years, many researchers have studied the dynamic response of suspended tunnel tube, anchoring system, pipe and cable coupling model. It is rare to simplify the suspension tunnel into an elastic beam with spring and damping at both ends of the support. In this paper, the main work is focused on the dynamic response of a suspended tunnel supported by elastic braces under vortex-induced vibration and moving load in a steady flow. In this process, the suspended tunnel is simplified as a superposition of a simply supported elastic beam and a rigid beam with spring and damping support. The spring stiffness and damping of elastic braces and the effects of moving load and moving velocity on the dynamic characteristics of suspension tunnel are studied by numerical simulation. The main contents of this paper are as follows: (1) considering the vortex-induced vibration in uniform flow, the suspension tunnel is simplified into an elastic supporting beam with spring and damping at both ends of the support. The structure dynamic equation of suspension tunnel under vortex-induced vibration is established. By Galerkin method and modal superposition method, the time-history displacement pattern of the suspended tunnel is obtained by using the Matlab tool. By analyzing the time-history displacement pattern of the suspension tunnel, the dynamic characteristics of the tube body under the vortex-induced vibration are obtained, and the effects of spring stiffness and damping of elastic support on the displacement are obtained. (2) the vibration model of pipe body under moving load is established. By Galerkin method and modal superposition method, the vibration differential equation of the system is solved, and the displacement of the suspended tunnel is simulated by Matlab tool. The results show that the suspension tunnel is loaded with different sizes and velocities. And the influence of stiffness and damping of elastic bracing on its displacement.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U459.5

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