Advanced Engineering Frameworks for Dynamic Foundation Interaction With Granular Soils Under Multi-Directional Loads

0201353，罗纳德帕克，美国Colorado-Boulder "Advanced Engineering Framework for Dynamic Foundation Interaction with Granular Soils under Multi-Directional Loads"在多方向激励下获得桑迪和砾石土上基础动力特性一致预测的主要困难来源是考虑到颗粒材料的复杂性质，动力接触问题的概念和分析框架的不足。 这一问题是土-结构动力相互作用、岩土工程和地震工程中许多重要应用的基础。这一行动是为了支持一个全面的研究计划，以：（i）通过离心模型，建立一个具有显著参数变化的扩大实验数据库，以便描绘各种土壤的嵌入式和表面基础反应的动态特性谱，（a）建立一个新的综合数据库，包括地基和荷载参数;（b）利用新的综合数据库，制定和实施一套双重分析框架。 第一个提供了一个简单的和概念上简洁的工程格式，以解决颗粒材料的动态行为的特殊特性，在目前的方法不占。 第二部分提供了对动态物理现象背后的颗粒连续介质力学问题的深入理解，通过这些发展，可以对现有的现场和实验室实验数据进行最新的重新评估。

0201353, Ronald Pak, U. of Colorado-Boulder"Advanced Engineering Framework for Dynamic Foundation Interaction with Granular Soils under Multi-Directional Loads"A major source of difficulty in obtaining consistent predictions of the dynamic behavior of foundations on sandy and gravelly soils under multi-directional excitation is the inadequacy in the conceptual and analytical framework for the dynamic contact problem, considering the complex nature of granular materials. This problem is the foundation of many important applications in dynamic soil-structure interaction, and geotechnical and earthquake engineering.This action is to support a comprehensive research program to: (i) develop, by means of centrifuge modeling, an enlarged experimental data base with significant parametric variations, so as to delineate the spectrum of dynamic characteristics of the embedded and surface foundation response for a variety of soils, foundations, and loading parameters; (ii) develop and implement, using the new comprehensive data base, a dual set of analytical frameworks. The first provides a simple and conceptually succinct engineering format to address the special characteristics of the dynamic behavior of granular materials not accounted for in current approaches. The second provides an in-depth understanding of the granular continuum mechanics problems underlying the dynamic physical phenomena.Through these developments, an up-to-date reassessment of existing field and laboratory experimental data can be pursued.