PERFORMANCE OF A SOIL-STRUCTURE SYSTEM UNDER NEAR-SOURCE EARTHQUAKES

近源地震下土壤结构系统的性能

• 批准号: 11650486
• 负责人: CHOUW Nawawi
• 金额: $ 2.24万
• 依托单位: OKAYAMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650486/
• 关键词: Near-source earthquakes; Response of soil-structure system; Strong vertical ground motions; Simultaneous excitation; Behaviour of secondary structures; Soil-structure interaction; Nonlinear responses; Structure-secondary structure interaction

The objective of this study is to investigate the characteristics of near-source earthquakes and their effect on the response of a structure-foundation-soil system as well as on the secondary structures. To reduce the effect of strong near-source earthquakes an approach consisting of steel springs and viscous dampers is recommended.The investigations reveal:At certain structure locations a consideration of horizontal ground motions alone will lead to an unrealistic response. While the vertical ground motions produces the maximum response, the horizontal ground motions produces no response.The development of plastic hinges in the structure does not change this finding.The time coincidence of subsequent peaks of the horizontal and vertical ground motions can cause much larger response than that produced by the horizontal ground motions. A simultaneous ground excitation should be therefore considered, especially in case of flexible structures.The soil has a slight reduction effect on the … More structural response. For the vertical response of the secondary structure, however, response amplification up to 100% can be observed. Consequently, in the design the soft ground-structure interaction should be considered.The effect of the interaction between secondary structure and structural member (SsSI) can cause an increase of the response of secondary structures, even though the vibration of the structural member, which supports the secondary structure, with and without SsSI are almost the same. For the design of a sensitive secondary structure the interaction between secondary structure and structural member is important.The introduced reduction approach can activate rigid body motions in the structural response, not only in the horizontal but also in vertical direction. The viscous dampers reduce these motions. These activated rigid body motions reduce the relative deformation of the structural members, and cause smaller activated forces in the structure.A reduction of the response of secondary structures can also be achieved. Less

本研究的目的是研究近源地震的特征及其对结构-地基-土壤系统以及二级结构响应的影响。为了减少强近源地震的影响，建议采用由钢弹簧和粘性阻尼器组成的方法。研究表明：在某些结构位置，单独考虑水平地面运动将导致不切实际的响应。虽然垂直地震动产生最大响应，但水平地震动不产生响应。结构中塑性铰链的发展并没有改变这一发现。水平和垂直地震动的后续峰值的时间重合可以引起比水平地震动产生的大得多的响应。因此，应考虑同步地面激励，特别是在柔性结构的情况下。土壤对结构响应有轻微的降低作用。然而，对于二级结构的垂直响应，可以观察到高达 100% 的响应放大。因此，在设计中应考虑软土地基与结构的相互作用。二级结构与结构构件（SsSI）之间的相互作用的影响会导致二级结构响应的增加，即使有和没有SsSI的支撑二级结构的结构构件的振动几乎相同。对于敏感二级结构的设计，二级结构和结构构件之间的相互作用非常重要。引入的简化方法可以激活结构响应中的刚体运动，不仅在水平方向而且在垂直方向。粘性阻尼器减少了这些运动。这些激活的刚体运动减少了结构构件的相对变形，并在结构中产生更小的激活力。还可以实现二级结构响应的减少。较少的

项目成果

Chouw, N., Hirose, S.: "Behaviour of a frame structure during near-source earthquakes"Proceedings of the 4^<th> European conf. on structural dynamics, Prague, Czech Republic, A.A. Balkema. 1191-1196 (1999)

Chouw, N., Hirose, S.：“近源地震期间框架结构的行为”第 4 届欧洲会议论文集。

Chouw, N.: "Relationship between near source earthquakes and structural responses"Proceedings of the 8^<th> Canadian conf. on earthquake engineering, Canadian Association for Earthquake Eng.. 205-210 (1999)

Chouw, N.：“近源地震与结构响应之间的关系”第 8 届加拿大会议论文集。

Chouw, N.: "Reduktion von Beanspruchungen von Tragwerken im Nahbebengebiet"Beitrage der DACH-Tagung, Universitaet Innsbruck, Oesterreich. 57-62 (2001)

Chouw, N.：“Reduktion von Beanspruchungen von Tragwerken im Nahbebengebiet”Beitrage der DACH-Tagung，因斯布鲁克大学，Oesterreich。

Chouw, N.: "Relationship between near source earthquakes and structural responses"Proc. of the 8^<th> Canadian conf. on earthquake engineering, Canadian Association for Earthquake Engineering. 205-210 (1999)

Chouw, N.：“近源地震与结构响应之间的关系”Proc。

Chouw, N.: "Reduction of the effects of strong vertical ground motions on structural responses"Proceedings of the 7^<th> US national conf. on Earthquake Eneineering, Boston, July 21-25. (in print). 10 (2002)

Chouw, N.：“减少强烈垂直地面运动对结构响应的影响”第 7 届美国国家会议记录。