Modeling of restoring force characteristics of rubber bearings under multi-axial loading

多轴载荷下橡胶支座恢复力特性建模

• 批准号: 10450172
• 负责人: ABE Masato
• 金额: $ 3.97万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10450172/
• 关键词: Base-isolation; laminated rubber bearing; high damping rubber; natural rubber; constitutive law; material test; visco-plasticity; image processing

Base-isolation is the recently developed technology to reduce seismic load to civil structures and currently widely used after the experience of 1995 Kobe Earthquake. High Damping Rubber (HDR), which has the damping property in addition to the flexibility, is a new material and has mainly been applied in base-isolated bearings in Japan. In this research, the phenomenological model of HDR is constructed, and this model is verified through the experiment of the base-isolated bearing under multi-axial loading conditions. High damping rubber material has not modeled yet and, thus, its main application, high damping rubber bearings (HDR), need experimental test prior to its installation to actual civil structures. In this research, the constitutive law of high damping rubber material is studied and this constitutive law is verified experimentally. At first, based on the results of the material tests, we proposed the constitutive law of high damping rubber which combines clasto-plastic body and hyper-elastic body. Here, special attention is paid systematically organize various material testing of rubber materials because current standards for mechanical testing of rubber materials are not sufficient for use to civil structures where extremely severe large deformation condition is expected in case of extreme seismic events. Then, (1) strain-field to surface of HDR was measured spatially through the image processing and (2) by applying the proposed constitutive law to the measured strain filed, we could get restoring force or the HDR. (3) Comparing the calculated restoring force with the experiment, we could verify the proposed constitutive law. Using this model, performance evaluation of HDR can be made numerically with high accuracy, which reduces the uncertainty involved in seismic design considerably.

基础隔震是最近开发的减少土木结构地震荷载的技术，在经历 1995 年神户地震后目前得到广泛应用。高阻尼橡胶（HDR）是一种新材料，除了具有柔韧性之外，还具有阻尼性能，在日本主要应用于基础隔震轴承。本研究构建了HDR唯象模型，并通过基础隔震轴承多轴加载条件下的实验验证了该模型。高阻尼橡胶材料尚未建模，因此其主要应用高阻尼橡胶支座（HDR）在安装到实际土木结构之前需要进行实验测试。本研究对高阻尼橡胶材料的本构规律进行了研究，并通过实验验证了该本构规律。首先，根据材料试验结果，提出了弹塑性体与超弹体相结合的高阻尼橡胶本构定律。这里特别注意系统地组织橡胶材料的各种材料测试，因为现有的橡胶材料力学测试标准不足以用于在极端地震事件中预计会出现极其严重的大变形条件的土木结构。然后，（1）通过图像处理在空间上测量 HDR 表面的应变场，（2）通过将所提出的本构定律应用于测量的应变场，我们可以获得恢复力或 HDR。 (3)将计算的恢复力与实验进行比较，验证了所提出的本构律。利用该模型，可以高精度地对HDR性能进行数值评估，从而大大减少抗震设计中的不确定性。

项目成果

吉田純司、阿部雅人、藤野陽三: "高減衰ゴムの構成則の構築"土木学会第54回年次学術講演会. (1999)

Junji Yoshida、Masato Abe、Yozo Fujino：“高阻尼橡胶本构定律的构建”，第 54 届日本土木工程学会学术年会（1999 年）。

阿部(分担共著): "構造物の振動制御(4)地震による橋梁の動的応答と設計・制御" 土木学会, 308 (1998)

Abe（合著者）：“结构的振动控制（4）地震引起的桥梁动力响应和设计/控制”日本土木工程师学会，308（1998）

Satoshi Takesada, Junji Yoshida, Masato Abe, Yozo Fujino: "Phenomenological model for high damping rubber bearing"The 54ィイD1thィエD1 annual meeting of Japan Society of Civil Engineers. (1999)

Satoshi Takesada、Junji Yoshida、Masato Abe、Yozo Fujino：“高阻尼橡胶支座的唯象模型”日本土木工程学会第 54 届年会（1999 年）。

阿部(分担共著): "構造物の振動制御(4)地震による橋梁の動的応答と設計・制御"土木学会. 308 (1998)

Abe（合著者）：“结构的振动控制（4）地震引起的桥梁动力响应和设计/控制”日本土木工程师学会 308（1998）。

Junji Yoshida, Satoshi Takesada, Masato Abe, Yozo Fujino: "Phenomenological model for high damping rubber bearings at bi-directional loading."Proceeding of the 25ィイD1thィエD1 Earthquake Engineering Conference, JSCE. 741-744 (1999)

Junji Yoshida、Satoshi Takesada、Masato Abe、Yozo Fujino：“双向载荷下高阻尼橡胶轴承的现象学模型”。25D1 地震工程会议论文集，JSCE 741-744 (1999)。