SGER: A Phase 1 Prediction of Dynamic Response of Spread Footings on Sand

沙地上扩展基础动力响应的第一阶段预测：佛罗里达大学丹尼斯·R·希尔图宁摘要：近几十年的研究在岩土场地的实验室和现场表征以及预测动态基础行为的数值方法方面都取得了重大进展。因此，用于计算地基动力响应的两个关键组成部分已经基本成熟。然而，几乎没有最新的信息可以通过比较已知条件下和受控加载下的预测和测量行为来评估这些新能力的质量。此外，在NEES设备点出现之前，动态加载全尺寸基础的设备并不容易获得。现在，能够加载全尺寸基础的设备已经可用，但尚未在验证应用程序中进行性能测试。这项研究将作为NEES有效载荷项目进行。它将直接利用NEES设备和现有的NEESR项目，CMS-0421275，“NEESR-II：作为应变水平的函数的土壤模数和阻尼的现场确定”，G.Biscontin，PI。该计划将测量、加载和测量位于一个场地上的三个浅基础的动态响应，该场地被完全归类为NEESR奖的一部分，授予比斯康丁教授。同时，动力基础反应的A级预测将由一小群贡献者进行，并将预测与测量的性能进行比较。预测活动的结果将在即将举行的地质研究所会议期间的一次特别会议上提出，并在岩土工程特别出版物上发表。此次预测活动将是通过弥合当前理论与实际表现之间的差距来改进动态基础设计的活动的一部分。通过提供更稳健的设计工具，可以减少过度保守造成的额外设计和施工成本。研究提供的模型验证为与基础动力学相关的工程实践提供了一个重大进展的现实机会。通过预测活动和拟议的地球研究所会议和出版物展示基金会动态，为教育和外联提供了多方面的机会。该活动面向的是执业工程师，但也预计工程学教师将与研究生和本科生合作，制定对预期地基反应的预测。

A Phase 1 Prediction of Dynamic Response of Spread Footings on SandPI: Dennis R. Hiltunen, University of FloridaAbstract:Recent decades of research have produced significant advancements in both laboratory and in situ characterization of geotechnical sites, and in numerical methodologies for prediction of dynamic foundation behavior. Thus, two of the key components for calculating the dynamic response of footings have matured substantially. However, there is little recent information available to assess the quality of these new capabilities by way of comparisons between predicted and measured behavior in known conditions and under controlled loading. Furthermore, equipment to dynamically load full-scale foundations has not been easily available until the advent of the NEES Equipment Sites. Now, equipment capable of loading full-scale foundations is available, but is as yet untested for performance in a verification application.This research will be conducted as a NEES payload project. It will directly utilize NEES equipment and an existing NEESR project, CMS-0421275, "NEESR-II: In Situ Determination Of Soil Modulus And Damping As A Function Of Level Of Strain," G. Biscontin, PI. The plan is to instrument, load, and measure the dynamic response of three shallow foundations located on a site thoroughly categorized as part of the NEESR Award to Prof. Biscontin. In conjunction, class A predictions of dynamic foundation response will be made by a small group of contributors, and the predictions will be compared with measured performance. The results of the prediction event will be presented at a special session during an upcoming Geo-Institute conference, and published in a Geotechnical Special Publication. The prediction event will be part of a campaign to improve dynamic foundation design by bridging the gap between current theory and actual performance. By providing more robustly calibrated design tools, excess design and construction costs created by over conservatism can be reduced.The model verification afforded by the research provides a realistic opportunity for significant advances in engineering practice related to foundation dynamics. The showcasing of foundation dynamics via the prediction event and a proposed Geo-Institute session and publication provides a multi-faceted opportunity for education and outreach. The event is targeted at practicing engineers, but it is also expected that engineering faculty will work in concert with graduate and undergraduate students to develop predictions of expected foundation response.