A study on the estimation of the seaquake response of a floating structure considering the characteristics of seismic wave propagation in the ground and the water |
| |
Authors: | Hiroaki Takamura Koichi Masuda Hisaaki Maeda Masatoshi Bessho |
| |
Affiliation: | (1) Nishimatsu Construction Co., Ltd., 2570-4 Shimotsuruma, Yamato 242-8520 Japan, JP;(2) College of Science and Technology, Nihon University, Chiba, Japan, JP;(3) University Research Center, Nihon University, Chiba, Japan, JP;(4) Emeritus of the Defense Academy, Yokosuka, Japan, JP |
| |
Abstract: | Seaquakes, which are characterized by the propagation of vertical earthquake motion at the sea bottom as a compression (longitudinal)
wave, are reported to cause damage to ships, and their effect on floating structures is a matter of great concern. To comprehend
the basic properties of seaquakes, we first discuss a method to calculate the displacement of the seabed when it is subjected
to hydrodynamic pressure. To investigate the interrelationship between the vibration of a floating structure and the deformation
of the seabed, a new boundary integral equation is derived which assumes that the seabed is a semiinfinite homogeneous elastic
solid in order to analyze the seaquake-induced hydrodynamic pressure acting on the floating structure. By considering the
propagation of the seismic wave in the ground and in the water, the incident wave potential in seaquake problems is also deduced
and its characteristics are discussed. Finally, the response of a very large floating structure in a seaquake is investigated
using a fluid force analysis method, and considering the interrelationship between the vibration of the floating structure
and the deformation of the seabed.
Received: August 19, 2002 / Accepted: November 11, 2002
Address correspondence to: H. Takamura (hiroaki_takamura@nishimatsu.co.jp)
Updated from the Japanese original, which won the 2002 SNAJ prize (J Soc Nav Archit Jpn 2001;189:87–92,93–100 and 190:381–386) |
| |
Keywords: | Seaquake Sea shock Very large floating structure Kernel function |
本文献已被 SpringerLink 等数据库收录! |
|