Modeling of Building - Foundation Response to Earthquake Ground Motion Using a Geotechnical Centrifuge

抗震结构的安全、经济设计需要了解地震荷载引起的动力运动。结构与地基-土支撑之间的动力相互作用对结构的响应有重要影响。本课题主要研究地震作用下建筑物与基础的相互作用。岩土工程离心机正在进行一项实验计划，以模拟在地表基础（与桩基础相反）上建造的多层建筑在地震地面运动时的性能。本研究包括自由场运动、基础稳态振动以及结构-基础-土壤相互作用现象的研究。这些信息正被纳入一个数学模型，用来描述地表基础上的建筑物在受到地震激励时的动态运动。该数学模型也可用于验证、校准和组合已提出的各种分析程序。该研究的另一个结果是进一步提高了使用土工离心机研究复杂土-结构相互作用问题的能力。

The safe, economical design of earthquake-resistant structures requires an understanding of the dynamic motions resulting from earthquake loading. The dynamic interaction between a structure and its foundation-soil support can have a significant influence on the response of the structure. This research program is investigating the building-foundation interaction under seismic excitation. An experimental program is being conducted on geotechnical centrifuges to simulate the performance of multi-story buildings constructed on surface foundations (as opposed to pile foundations) when subjected to earthquake ground motions. The study includes investigations of the free-field motion, steady-state vibrations of foundations, as well as the full structure-foundation-soil interaction phenomenon. This information is being incorporated into a mathematical model to describe the dynamic motions of buildings on surface foundations when subjected to earthquake excitations. This mathematical models can also be used to validate, calibrate, and combine various analytical procedures that have been proposed. Another outcome of the study is to further the capability of using the geotechnical centrifuge to investigate complex soil-structure interaction problems.