Dynamic Characterization of Shallow Foundations on Granular Soils

9320539 Pak本项目的目的是提高目前对动态土壤-基础相互作用的理解，从理论到实践，重点是嵌入粒状土壤中的浅建筑基础。 其目标是：（1）检查和描述现有的分析和数值解对物理问题的适用性，（2）进行彻底的参数研究，以阐明重要的基础和土壤参数对动力响应的影响，（3）通过校准确定和调整相关的现有理论，使其适用于粒状土壤条件，和（4）开发更全面的解决方案和公式来处理这类问题固有的应力引起的非均匀土壤条件。 为了实现这些目标，将在土工离心机上进行一系列基本实验。 感兴趣的是在地震和随机荷载作用下，确定在垂直，水平和摇摆模式下的基础响应。 特别注意的是一个全面的数据集的发展的影响：（一）基础尺寸，（二）静态基础载荷，（三）由于动态激励水平的非线性，（四）基础形状，（五）嵌入，（六）内在和全球参数的动态响应。 除了为进一步的理论和数值发展提供急需的物理基础外，这项研究还可以推导出直接的半经验关系，这对设计师来说具有直接的价值。 ***

9320539 Pak The aim of this project is to improve the current understanding of dynamic soil-foundation interaction, from theory to practice, focusing on shallow building foundations embedded in granular soils. The objectives are to: (1) examine and delineate the applicability of existing analytical and numerical solutions to the physical problem, (2) perform thorough parametric studies to clarify the influence of important foundation and soil parameters on the dynamic response, (3) identify and adapt relevant existing theories to granular soil conditions by calibration, and (4) develop more comprehensive solutions and formulas to deal with the stress-induced heterogeneous soil conditions intrinsic to this class of problems. To achieve these goals, a fundamental series of experiments will be conducted on a geotechnical centrifuge. The interest is in determining the foundation response in vertical, horizontal, and rocking modes under earthquake and random loading. Particular attention is given to the development of a comprehensive data set on the effects of: (i) foundation size, (ii) static foundation load, (iii) nonlinearities due to dynamic excitation levels, (iv) foundation shape, (v) embedment, and (vi) intrinsic and global parameters on the dynamic response. In addition to furnishing the much-needed physical basis for further theoretical and numerical developments, this research will allow the derivation of direct semi-empirical relationships which can be of immediate value to designers. ***