THE EFFECT OF ICE ON THE SEISMIC RESPONSE AND DYNAMIC STABILITY AGAINST SLIDING OF OFF-SHORE STRUCTURES

冰对海上结构地震响应和抗滑动力稳定性的影响

• 批准号: 02805054
• 负责人: MIURA Fusanori
• 金额: $ 0.9万
• 依托单位: YAMAGUCHI UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02805054/
• 关键词: OFF-SHORE STRUCTURE; SEISMIC RESPONSE; ICE; NONLINEARITY; HYDRODYNAMIC PRESSURE; ANISOTROPY; SLIDING STABILITY; 地震応答解析; 非線形解析; 有限要素法; 半無限要素; 水との相互作用; 動的相互作用

The purpose of this study is to investigate the effect of ice on the seismic response and dynamic stability against sliding of a large scale off-shore structure that is surrounded by thick ice.The general method for analyzing the nonlinear soil-structure-water-ice interaction system was proposed first. In the method, a simple semi-infinite element method is newly introduced to express the semi-infinitely extending water system. The accuracy of the method was demonstrated by using dam-water-foundation models.Then the nonlinear soil-structure-water-ice interaction system was analyzed by the two dimensional finite element method. In modeling the system, modified joint elements were used to simulate sliding phenomena at the interface between the soil and the structure base.The effect of the hydrodynamic pressure acting on the structural surface was examined by comparing the effect of virtual mass of water. Generally, the exact estimation of the hydrodynamic pressure gave the smaller response of displacements and velocities of the structure but larger accelerations than those obtained from the virtual mass method.The effect of the material nonlinearity of soil was examined. The effect was very small when the soil strength which was obtained from the laboratory test of the soil of the site.The effect of anisotropy of ice was also examined. The effect was not negligible when the ice becomes hard, i.e. the temperature was very low.

为了研究冰对被厚冰包围的大型近海结构物的地震反应和抗滑动力稳定性的影响，提出了分析土-结构-水-冰相互作用系统的一般方法。在该方法中，新引入了一种简单的半无限元方法来表示半无限延拓的水系。通过大坝-水-地基模型验证了该方法的准确性。然后对土-结构-水-冰的非线性相互作用系统进行了二维有限元分析。在系统建模中，采用改进的节理单元来模拟土与结构基础界面的滑动现象，通过比较虚拟水质量的影响来考察动水压力对结构表面的影响。一般情况下，与虚拟质量法相比，精确估计动水压力时结构的位移和速度响应较小，而加速度较大。对场地土体进行室内试验，得到的土体强度对强度的影响很小，并考察了冰的各向异性的影响。当冰变硬，即温度很低时，这种影响是不可忽视的。

项目成果

三浦 房紀,王 均: "水との動的相互作用を考慮に入れた構造物・地盤系の非線形応答解析法." 土木学会震工学研究発表会講演概要集. (1991)

Fangki Miura、Jun Wang：“考虑与水的动态相互作用的结构和地面系统的非线性响应分析方法。”日本土木工程师学会地震工程研究会议演讲摘要集（1991）

三浦 房紀,王 均: "水との相互作用を考慮に入れた氷海構造物の動特性に及ぼす氷の影響" 土木学会論文集(第6部門).

Fangki Miura，Jun Wang：“考虑与水的相互作用，冰对冰海结构动态特性的影响”日本土木工程师学会会议记录（第六部门）。

三浦 房紀,王 均: "半無限要素を用いた構造物-水-地盤系の時間領域動的解析手法。" 土木学会論文集(第1部門).

Fangki Miura，Jun Wang：“使用半无限元的结构-水-地面系统的时域动态分析方法。”日本土木工程师学会论文集（第 1 部分）。

F.MIURA AND J.WONG: "NONLINEAR DYNAMIC ANALYSIS OF GROUND-STRUCTURE-WATER INTERACTION SYSTEMS, PROC. OF 2ND INT. CONF. ON NONLINEAR MECHANICS."

F.MIURA 和 J.WONG：“地基-结构-水相互作用系统的非线性动态分析，第二届非线性力学国际会议议程”。

三浦 房紀,王 均: "半無限要素を用いた水ー構造物ー地盤相互作用系の時間領域解析手法" 土木学会第21回地震工学研究発表会概要集. 453-456 (1991)

Fangki Miura，Jun Wang：“使用半无限元的水-结构-地面相互作用系统的时域分析方法”第21届地震工程研究会议摘要，日本土木工程师学会453-456（1991）。