AN INVESTIGATION ON THE DYNAMIC BEHAVIOR OF SUBMERGED FLOATING TUNNELS

本研究的目的是调查淹没浮动隧道在波浪和地震行动下的动态行为的特征，是设计中的关键力量。Moreover，对结构设计的讨论的有效光束模型也提出了。在波浪力量下最重要的发现是最大化的;对于腿排列类型-A：1。另一个长期的置换是伟大的，而松弛的最少可能与这一安排一起使用。隧道元素之间的连接的强度对隧道的横向置换有一个主要的影响，即整个隧道。类型的理想连接类型--将是一个别针连接。横向置换和最大弯曲时刻在刚性连接增加与波浪事件的角度。用于腿排列C型：1。横向置换比A型少得多，但松弛更有可能发生。在长期置换中发现没有明显的变异与不同的联合权利。在地震波下的分析结果可以被总结为跟随：1。如果结构的自然周期是足够长的时间与seismic wave的预测周期相比较，最大响应的置换或弯曲时刻的设计是近似可预测的，与同时激动的分析。当结构的自然周期接近于海浪的前周期，传播速度发挥了动态反应的重要作用，并应该被纳入会计。由于预测部门力，例如在连接时弯曲的时刻，传播速度应该谨慎地作出决定。在订单中讨论结构的全球行为，并开发了一个弹性基金的波束模型，以用于在相等间隔间隔处铺设的嵌入式浮动隧道和张力腿。It Is shown that the approximation of a unManagement continuous elastic foundation is reasonable whenever k-D2v-D2h-D13-D1/（6 EI）-0. 2。

The purpose of this study is to investigate the characteristics of the dynamic behavior of submerged floating tunnels under wave and seismic action, which are critical forces in design. Moreover, effective beam model for discussion on the design of structure is also presented.The most important findings under wave force are summarized as follows;For leg arrangement Type-A :1. Although lateral displacement is great, slack is least likely to occur with this arrangement.2. The rigidity of the joints between tunnel elements has a major effect on the lateral displacement of the tunnel as a whole. The ideal type of joint for Type-A would be a pin joint. Lateral displacement and the maximum bending moment in rigid joints increases with the angle of wave incidence.For leg arrangement Type-C :1. Lateral displacement is much less than in type A, but slack is more likely to occur.2. No significant variations in lateral displacement are found with different joint rigidities.The results of analysis under seismic wave can be summarized as follows:1. If the natural period of the structures is long enough comparing to the predominant period of seismic wave, maximum response of displacement or bending moment for design are approximately predictable by an analysis with simultaneous excitation. When the natural period of the structure is close to the predominant period of seismic wave, propagation velocity plays an important role for dynamic response and it should be taken into account.2. For prediction of sectional force like the bending moment at the joints, propagation velocity should be carefully decided.In order to discuss the global behavior of the structure, a beam model on elastic foundation is developed for submerged floating tunnel with tension legs spaced at equal interval. It Is shown that the approximation of a uniform continuous elastic foundation is reasonable whenever kィイD2vィエD2hィイD13ィエD1/(6EI)≦0.2.