掲載雑誌（和）： 日本地震工学シンポジウム講演集 Vol： 5巻 年： 1978年 頁： 1041-1048頁 著者（和）： - タイトル（和）： - 抄録（和）：
- キーワード（和）： - 掲載雑誌（英）： PROCEEDINGS OF JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM 著者（英）： T. HAMAMOTO, Noboru KONISHI, Yasuo TANAKA タイトル（英）： STUDY ON DYNAMIC BEHAVIOURS OF SHELL-TYPE OFFSHORE TOWERS DURING EARTHQUAKES 抄録（英）：
The dynamic response of fixed offshore towers subjected to earthquake ground motion is studied. The mathematical model of the offshore tower structure used in this investigation is a cantilever circular cylindrical shell and therefore an important aspect of the problem is the exterior fluid-shell interaction. In the analysis, the following assumptions are made: (a) The shell is thin and elastic, (b) the water is inviscid, incompressible and irrotational, (c) the effects of surface waves can be ignored, (d) the amplitude of motion is small and therefore a linear analysis is sufficient. The hydrodynamic pressure generated by the vibrating structure is obtained by potential flow theory. The response to ground motion is determined by step-by-step integration of the modal equations of motion, which are derived by energy method. Three offshore towers having different values of height to radius ratio are considered in order to perform example analyses. The numerical computations for each tower are carried out. キーワード（英）： - 記事区分： - 区分 　　　委員会論文集