动力荷载作用下水中悬浮隧道管体的位移响应

发布时间：2018-04-27 18:07

本文选题：水中悬浮隧道 + 冲击荷载　；参考：《合肥工业大学》2017年硕士论文

【摘要】：水中悬浮隧道作为一种新型的穿越水域的交通形式,通过结构的自重、浮力和锚固系统的共同作用,维持在水中的平衡和稳定。由于悬浮隧道自身所具有的经济性和环保性,其概念一经提出,便获得了各国科研工作者的广泛关注。由于悬浮隧道所处的水下环境复杂,还有许多问题亟待解决。本文首先提出一种“V”型锚固结构概念设计,主要包含接头结构设计和锚索布设设计,这种型新概念设计克服了传统锚固结构设计的局限性,充分发挥锚固结构材料的作用,增加结构的跨度,同时便于悬浮隧道管体水下对接和安装,可为未来悬浮隧道的设计研究提供一种新的锚固结构设计思路和重要的工程参考。随后,为了研究悬浮隧道管体在动力荷载作用下的位移响应行为,本文首先建立等间距移动荷载作用下的悬浮隧道动力学模型,将悬浮隧道管体简化为两端设有阻尼的弹性支撑梁,并利用Galerkin法求解悬浮隧道的振动位移方程,采用数值模拟方法获得悬浮隧道的跨中时程响应,分析张力腿竖向刚度、移动荷载大小、移动速度和行车间距对悬浮隧道管体跨中位移的影响。结果表明:张力腿竖向刚度对悬浮隧道管体位移响应的影响最明显。其次,移动荷载大小和速度以及行车间距也会显著影响悬浮隧道管体的跨中位移。本文还建立冲击荷载作用下悬浮隧道的动力学模型,更进一步的,将悬浮隧道简化为等间距弹性支撑梁,运用相同的分析方法,研究张力腿竖向刚度、冲击物质量、冲击速度对悬浮隧道跨中位移的影响。结果表明:冲击荷载作用下,张力腿竖向刚度对悬浮隧道位移响应具有显著影响,但这种影响具有极限性。另外,冲击物质量和冲击速度也是影响悬浮隧道跨中振动位移的主要因素。
[Abstract]:As a new type of traffic through the water area, the floating tunnel in water can maintain the balance and stability in the water through the joint action of structure weight, buoyancy and anchoring system. Because of its economy and environmental protection, the concept of suspended tunnel has been widely concerned by researchers all over the world. Because the underwater environment of the suspended tunnel is complex, there are still many problems to be solved. In this paper, a concept design of "V" type Anchorage structure is put forward, which mainly includes the design of joint structure and the design of anchor cable. This new concept design overcomes the limitation of the traditional design of Anchorage structure and gives full play to the function of the Anchorage structure material. Increasing the span of the structure and facilitating the underwater docking and installation of the pipe body of the suspended tunnel can provide a new design idea and an important engineering reference for the design and research of the suspension tunnel in the future. Then, in order to study the displacement response behavior of the suspended tunnel tube under the dynamic load, the dynamic model of the suspension tunnel under the moving load with equal spacing is first established in this paper. The suspension tunnel tube is simplified as an elastic support beam with damping at both ends, and the vibration displacement equation of the suspension tunnel is solved by Galerkin method. The mid-span time-history response of the suspended tunnel is obtained by numerical simulation, and the vertical stiffness of the tension leg is analyzed. The effect of moving load, moving speed and driving distance on the mid-span displacement of suspended tunnel tube. The results show that the vertical stiffness of the tension leg has the most obvious effect on the displacement response of the suspended tunnel tube. Secondly, the magnitude and speed of moving load and the distance between vehicles will significantly affect the mid-span displacement of the suspended tunnel tube. The dynamic model of suspension tunnel under impact load is also established in this paper. Furthermore, the suspension tunnel is simplified as an elastic support beam with equal spacing, and the vertical stiffness and impact mass of the tension leg are studied by the same analytical method. The effect of impact velocity on the mid-span displacement of suspension tunnel. The results show that the vertical stiffness of the tension leg has a significant effect on the displacement response of the suspension tunnel under impact loading, but this effect is limited. In addition, the impact mass and impact velocity are also the main factors affecting the vibration displacement of suspension tunnel.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U459.5

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