The effect of the gap near the surface in the earthquake response of the structure-pile foundation-ground system

近地表间隙对结构-桩基础-地基系统地震响应的影响

• 批准号: 14550484
• 负责人: KATADA Toshiyuki
• 金额: $ 2.05万
• 依托单位: Musashi Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550484/
• 关键词: Centrifuge Modeling Test; Pile Foundations; Gap; Dynamic Subgrade Reaction Model; Dynamic Magnification Factor; Natural Frequency; 振動モード

The gap near the pile head has been passed over in dynamic behavior of the structure-pile foundation-surface ground system during an earthquake. Therefore, in this study, the subgrade reaction model considering "the gap between surface ground and pile head" was formulated on the elasto-plasticity theory. And that the effect of cyclic loading was also considered in this model. The numerical results of the response analysis were verified by the centrifugal model experiment.A temporary tower crane that was supported on the pile foundation was numerically and experimentally analyzed. Both analytical results agreed well. And also, it became clear that the generation and expansion of the gap near the pile head effected on the vibration characteristics of the tower crane.It is meant that the subgrade reaction model considering the gap is useful to analyze the earthquake response of structure-pile foundation-surface ground system at the good accuracy.

地震期间，桩头附近的缝隙已在结构 - 底基粉底表面地面系统的动态行为中传递。因此，在这项研究中，考虑“表面地面和桩头之间的差距”的子级反应模型是在弹性塑性理论上提出的。并且在该模型中也考虑了环状载荷的效果。通过离心模型实验验证了响应分析的数值结果。在桩基础上支持的临时塔起重机是数值和实验分析的。两种分析结果都很好。而且，很明显，桩头附近的间隙的产生和扩展是在塔起重机的振动特性上作用的。这意味着考虑差距的子分级反应模型对于分析结构孔的地震响应是有用的。基础表面地面系统的精度良好。