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Investigation of spatially varying ground motions and soil-structure interaction effect on bridge girder pounding

空间变化地震动和土-结构相互作用对桥梁梁撞击的影响研究

基本信息

批准号：
15560404
负责人：
CHOUW Nawawi
金额：
$ 2.3万
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：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560404/
关键词：
Near-source earthquake Response of soil-foundation-structure system Non-linear response of soil-structure system Pounding of bridge girders Spatial variation of ground motions Soil-structure interaction Prevention of bridge girder unseating

项目摘要

The subject of the investigation is the simultaneous influence of spatial variation of ground motions and soil-structure interaction on the relative response of bridge structures. The duration of this research project is three years, and the fiscal year 2005 is the last year.In the following the results of the investigation are summarized :If the soil is soft and the neighbouring structures do not have the same slenderness, even though they have the same fixed-base fundamental frequency and experience the same ground excitation, pounding can take place, because with different slenderness both adjacent structures can vibrate out-of-phase.In the case of frequency ratio larger than 0.6 the simultaneous effect of non-uniform ground motions and soil-structure interaction can significantly amplify the girder damage potential due to larger contact forces. Consequently, damage due to multiple subsequent poundings is possible.In the frequency ratio range around 1.0 and also in the higher freque … More ncy ratio range above 1.6 non-uniform ground motions have stronger influence than soil-structure interaction. If the adjacent structures have different slenderness, however, soil-structure interaction can have stronger effect than non-uniform ground motions even at the frequency ratio of 1.0.Although the Japanese design specification is currently the most advanced and strictest regulation and implicitly includes the effect of spatial variation of ground motions, the required seating length may still not be adequate, especially when the neighbouring bridge structure is flexible and when both structures experience different SSI.Different soil-structure interaction can also occur, even though both adjacent structures have the same slenderness, the same fundamental frequency and experience the same ground excitation, if the supporting soil is spatially not uniform. This unequal soil-structure interaction can significantly affect the relative structural response. It should be incorporated together with the influence of spatially non-uniform ground excitation in future design regulations. Less

研究的主题是地面运动空间变化和土壤-结构相互作用对桥梁结构相对响应的同时影响。本研究项目为期三年，2005财年为最后一年。现将调查结果总结如下：如果土质较软，相邻结构的细长度不同，即使固定基频相同，受到相同的地面激励，也会发生撞击，因为细长度不同，相邻结构会异相振动。在频率比大于0.6的情况下非均匀地面运动和土壤-结构相互作用的同时影响会因较大的接触力而显着放大梁损坏的可能性。因此，多次后续撞击可能会造成损坏。在 1.0 左右的频率比范围内以及在 1.6 以上的较高频率比范围内，非均匀地面运动的影响比土壤-结构相互作用的影响更大。然而，如果相邻结构具有不同的细长度，即使频率比为 1.0，土-结构相互作用也会比非均匀地震动产生更强的影响。尽管日本设计规范是目前最先进、最严格的规定，并且隐含地包含了地震动空间变化的影响，但所需的座位长度可能仍然不够，特别是当相邻桥梁结构是柔性的并且两个结构经历不同的 SSI 时。如果支撑土壤在空间上不均匀，即使两个相邻结构具有相同的细长、相同的基频并经历相同的地面激励，也可能发生土壤-结构相互作用。这种不均匀的土壤-结构相互作用会显着影响相对的结构响应。在未来的设计规范中应将其与空间不均匀地面激励的影响一起纳入考虑。较少的