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Shaking Table Test allowing Interpretation of Damage to Structure in terms of Energy Influx and Efflux through Soil-Structure Interface

振动台测试可以通过土壤-结构界面的能量流入和流出来解释结构损坏

基本信息

批准号：
10450174
负责人：
KONAGAI Kazuo
金额：
$ 6.78万
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-10450174/
关键词：
Shaking table Energy influx and efflux Soil-Structure interaction Structure model Real-time control

项目摘要

With a view to incorporate the interaction between soil and structure without using any physical ground model, Konagai et al. (1997〜1998) introduced a new method for shaking table tests. In their method, appropriate soil-structure interaction motions are added to free-field ground motions to simulate soil-structure interaction effects. The method considers radiation damping which, in general, causes the total damping of a soil-structure system to be greater than that of the structure itself, Thus the incorporation of soil-structure interaction effects in a shaking table test leads to reducing the demands on the capacity of shaking tables. This dynamic interaction is a phenomenon associated with the influx and efflux of energy which is generated by the earthquake excitation and transmitted through the soil-structure interface. It is noted that the difference between the influx and efflux is exactly the energy stored up within a structure, and thus, is closely related to the extent of da … More mage to the structure. If these interaction effects are rationally simulated in shaking table tests, one will obtain the necessary pieces of information for interpreting the failure processes of prototype structures in terms of energy.The method was initially developed with the assumption that soil behaves linearly in the present report, the method is extended to take the 'far field' soil non-linearity into account through an equivalent linear approach. The non-linearity produced in the vicinity of foundations, which is usually associated with large strain and separation between soil and foundation, has not been considered in this study. In this method the dynamic soil parameters are varied in real time by means of a digital signal processor. The method, on one hand, captures the non-linear soil behavior of softening and re-hardening during the course of an earthquake, and on the other hand, allows testing of a bigger superstructure model by obviating the need of a heavy physical ground model. Less

Konagai et al.（1997 ~ 1998）为了在不使用任何物理地基模型的情况下纳入土与结构之间的相互作用，提出了一种新的振动台试验方法。在他们的方法中，适当的土-结构相互作用运动加入自由场地震动来模拟土-结构相互作用效应。该方法考虑了辐射阻尼，一般情况下，辐射阻尼会导致土-结构体系的总阻尼大于结构本身的总阻尼，因此在振动台试验中考虑土-结构相互作用的影响，可以降低对振动台承载力的要求。这种动力相互作用是一种由地震激发产生并通过土-结构界面传递的能量流入和流出的现象。值得注意的是，流入和流出之间的差异正是结构中储存的能量，因此，与数据的范围密切相关。如果在振动台试验中合理地模拟这些相互作用，将获得从能量角度解释原型结构破坏过程的必要信息。该方法最初是在假设土壤在本报告中表现为线性的情况下开发的，该方法通过等效线性方法扩展到考虑“远场”土壤非线性。在基础附近产生的非线性，通常与大应变和土基分离有关，在本研究中没有考虑。该方法通过数字信号处理器实时改变土壤动态参数。该方法一方面捕捉了地震过程中土壤软化和再硬化的非线性行为，另一方面，通过消除对重型物理地面模型的需要，可以测试更大的上层建筑模型。少