STUDY ON QUANTITATIVE EVALUATION OF SOIL GROUND DAMPING

土壤地面阻尼定量评价研究

• 批准号: 60550397
• 负责人: KUSAKABE Kaoru
• 金额: $ 1.47万
• 依托单位: KOBE 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: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60550397/
• 关键词: Equivalent Viscous Damping Coefficient; Groung Compliance; Rational Function; Thin Layered Element Technique; Softer Zone; Vibration Generator Test; Embedded Structure; 埋戻効果

A purpose of this project is to evaluate quantitatively equivalent stiffness coefficient and viscous damping coefficient on a soil ground, analytically and experimentally. Following results are obtained.1. Dynamical ground compliance which is a dynamic property of a soil ground and which is dependent on frequency, is represented by an approximate rational function, and then is replaced by a vibration system which consists of springs and dashpots which are independent on frequency. This method makes the earth-quake response analysis of the soil-structure interaction system possible.2. Considering that a cylindrical basement is buried in a soil ground with a softer zone between it and it's outer soil medium, the effect of sidefill rigidity on vibration characteristics of a soil-basement system is discussed. It is pointed out that the smaller the wave velocity of the softer zone to that of the outer soil medium, the greater the real part of the displacement response at the top of the basement, in lower frequency.3. Vibration tests on embedded foundations are carried out by using of a vibration generator. A feature of this experiment is to treat with the two cases for the foundation having a gap between it and it's outer soil ground, and the foundation filled up around it. The effect of sidefill on the amplitude characteristics is discussed.4. From these vibration characteristics, an equivalent spring coefficient and a viscous damping coefficient are calculated, especially, both coefficients are separeted into a part of contribution at the bottom and a part of that at the side of the foundation. It is pointed out that the effect of sidefill on equivalent spring and viscous damping coefficients is greater for horizontal excitation than vertical one, and also is greater for viscous damping than spring coefficient.

该项目的目的是通过分析和实验来定量评估土壤地面上的等效刚度系数和粘性阻尼系数。得到以下结果： 1．动态地面柔量是土壤地面的动态特性，与频率相关，用近似有理函数表示，然后用与频率无关的由弹簧和缓冲器组成的振动系统代替。该方法使得土-结构相互作用系统的地震反应分析成为可能。 2．考虑到圆柱形地下室埋在土壤地面中，其与外部土壤介质之间存在较软的区域，讨论了侧填土刚度对土壤-地下室系统振动特性的影响。指出在较低频率下，较软地带的波速相对于外部土壤介质的波速越小，基底顶部位移响应的实部越大。 3．嵌入式基础的振动试验是利用振动发生器进行的。本次实验的一个特点是针对地基与外土地面之间存在间隙以及地基周围填满的两种情况进行处理。讨论了侧边填充对幅值特性的影响。 4．根据这些振动特性，计算出等效弹簧系数和粘性阻尼系数，特别是，这两个系数被分为底部贡献的一部分和基础侧面贡献的一部分。指出侧填料对水平激励的等效弹簧系数和粘性阻尼系数的影响大于垂直激励的影响，对粘性阻尼的影响也大于弹簧系数。

项目成果

MIZUHATA, Koji: "Reconsideration on the Dynamical Ground Compliance expressed by the Rational Function (in Japanese)" Reports of the Architectural Institute of Japan (Kinki sub-Division). 217-220 (1986)

MIZUHATA, Koji：“对有理函数表达的动态地面顺从性的重新考虑（日语）”日本建筑学会（近畿分部）的报告。

水畑耕治: 日本建築学会大会学術講演梗概集. 623-624 (1986)

Koji Mizuhata：日本建筑学会会议学术讲座摘要 623-624 (1986)。

水畑耕治: 日本建築学会大会学術講演梗概集. 527-528 (1986)

Koji Mizuhata：日本建筑学会会议学术讲座摘要 527-528 (1986)。

日下部馨: 第7回日本地震工学シンポジウム(1986)講演集. 1033-1038 (1986)

Kaoru Kusakabe：第七届日本地震工程学研讨会论文集（1986）1033-1038（1986）。

MIZUHATA, Koji: "Dynamical Characteristics of Embedded Mass Obtained by Vibration Generator Test, Part 1 - Part 3 (in Japanese)" Summaries of Technical Papars of Annual Meeting, Architectural Institute of JAPAN. 527-532 (1986)

MIZUHATA, Koji：“通过振动发生器测试获得的嵌入质量的动态特性，第 1 部分 - 第 3 部分（日语）”日本建筑学会年会技术论文摘要。