Development of dynamic simulation method for floating bridges subjected to wind and wave loadings

浮桥风浪荷载动力模拟方法开发

• 批准号: 13555131
• 负责人: WATANABE Eiichi
• 金额: $ 6.91万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13555131/
• 关键词: floating bridge; wave response analysis; simulation; modal method; dynamic response analysis; wind tunnel experiment; fender mooring; 風応答; 波浪応答; メモリー効果; 浮体基礎; シュミレーション

The objective of this research is to develop a method for prediction of dynamic response of a floating bride subjected to wind and wave loadings where the following three items can be considered at the same time 1) elastic deformation of the superstructure, 2) frequency dependence of the hydrodynamic forces, and 3) nonlinear restoring force characteristics of the mooring system. In order to realize such a methodology, the following procedure has been implemented: 1) the super-structure of the floating bridge is modeled by Finite Element Method (FEM; NASTRAN is actually used) and the hydrodynamic force characteristics including frequency dependency is modeled by added-mass and damping characteristics defined at the nodal-points of the floating foundations, 2) in the modal-coordinates, the memory-effect function of the frequency-dependent hydrodynamic force and the nonlinear restoring force characteristics is solved by Newmark-β method.Then, the development of a computer program for prediction of dynamic response of a floating bridge subjected to irregular waves in the time domain has been made. In this research, the floating bridge with separate-type floating foundations is considered. The floating foundations are modeled as rigid-bodies, each of which having six degree of freedoms, and the super-structure, which connects the floating foundations, is modeled as linear elastic-body. The mooring systems are modeled as springs having nonlinear restoring force characteristics. Because of the frequency-dependence of the radiation wave forces, the memory effect has been taken into account in the time domain. The methodology of the developed program is presented with several numerical examples for a typical floating bridge with separate-type floating foundations.

本研究的目的是开发一种预测浮动桥梁在风浪载荷作用下的动力响应的方法，其中可以同时考虑以下三项：1）上部结构的弹性变形，2）频率依赖性水动力，以及 3) 系泊系统的非线性恢复力特性 为了实现这种方法，已实施以下步骤： 1) 通过有限元法对浮桥的上部结构进行建模。 （FEM；实际使用 NASTRAN），包括频率依赖性在内的水动力特性通过浮动基础节点处定义的附加质量和阻尼特性进行建模，2) 在模态坐标中，记忆效应函数为采用Newmark-β方法求解频率相关的水动力和非线性恢复力特性。然后，开发了用于预测浮桥在时域中不规则波浪作用下动力响应的计算机程序。在本研究中，考虑了具有分离式浮动基础的浮桥，每个浮动基础都具有六个自由度，并且连接浮动基础的上部结构被建模。由于辐射波力的频率依赖性，系泊系统被建模为具有非线性恢复力特性的弹簧，因此在时域中考虑了记忆效应。程序是给出了典型的分体式浮动基础浮桥的几个数值算例。

项目成果

渡邊 英一: "浮体橋の波浪応答シミュレーションプログラムの開発"構造工学論文集. 49A. 661-668 (2003)

Eiichi Watanabe：“浮桥波浪响应模拟程序的开发”结构工程杂志 49A（2003 年）。

渡邊 英一: "メモリー効果を考慮した浮体の時刻歴波浪応答解析"構造工学論文集. 48A. 963-969 (2002)

Eiichi Watanabe：“考虑记忆效应的浮体时程波响应分析”结构工程杂志 48A（2002）。

E.Watanabe: "Development of Dynamic Response Analysis Program for Floating Bridge subjected Wind and Wave Loadings"Proceedings of International Symposium on Ocean Space Utilization Technology. 449-456 (2003)

E.Watanabe：《风浪载荷下浮桥动力响应分析程序的开发》海洋空间利用技术国际研讨会论文集。

渡邊 英一: "円筒浮体群に作用する波力の解析解"構造工学論文集. 48A. 947-956 (2002)

Eiichi Watanabe：“作用于圆柱形浮体的波浪力的解析解”《结构工程杂志》48A（2002）。

E. Watanabe, T. Utsunomiya: "Development of dynamic response analysis program for floating bridges subjected to wind and wave loadings"Proc. of International Symposium on Ocean Space Utilization Technology. 449-456 (2003)

E.渡边，T.宇都宫：“风浪载荷下浮桥动力响应分析程序的开发”Proc。