等间距移动荷载作用下水中悬浮隧道管体的位移响应

Displacement response of submerged floating tunnel tube due to moving loads of constant intervals

建立一系列等间距移动荷载作用下悬浮隧道的动力学模型,将悬浮隧道管体简化为两端设有阻尼的弹性支撑梁,通过伽辽金法(Galerkin法)求解悬浮隧道管体的运动方程,数值模拟悬浮隧道管体的跨中位移时程响应,分析张力腿竖向刚度、移动荷载大小、移动速度、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;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。研究结论为未来悬浮隧道的研究和建设提供重要的理论参考。

In this paper, the submerged floating tunnel(SFT) tube is simplified as an elastically supported beam with two springs and dampers at each end. The dynamic equation for SFT is established to investigate its dynamics under a sequence of moving loads of constant intervals. By using the Galerkin method, the dynamic equation can be solved, and the mid-span displacement of SFT tube is gained by numerical simulation. The influences of anchor stiffness, moving loads and internals on SFT tube are obtained by analyzing the simulation results. It concludes that the anchor stiffness plays a significant role in influencing the SFT tube's displacement. Moreover, internals and velocities of moving loads also have remarkable impacts on the SFT tube's mid-span displacement. The research results provide a theoretical reference for further study and construction of the SFT.