Performance of Improved Ground under Strong Seismic Loading

0070278 Sitar地震期间液化引起的基础位移是所有类型结构损坏的主要原因。 然而，来自历史事件的证据表明，改善的场地比邻近的未改善的地区遭受更少的地面变形和沉降。 然而，随着地震工程朝着基于性能的设计方向发展，充分准确地预测地基元件（包括改良地基）性能的能力变得至关重要。本研究项目的最终目标是开发一套经验性、实验性、和控制地震引起的变形的参数的分析数据，作为基于性能的合理基础，设计 将在加州大学戴维斯分校国家岩土工程学院进行为期2年的研究计划，包括8个离心机实验。 该实验工作计划旨在提供一些急需的高质量定量实验数据。 然而，由于类似的工作，专门针对海洋结构物和装饰物目前正在计划在公共工程研究所（PWRI）和港口和海港研究所（PHRI）在日本，有一个独特的机会，以整合平行的研究，并获得比较和评估几个独立的数据集的好处。 该项目在NSF 98-36下的第三年竞争中得到支持。“美日城市地震减灾合作研究。"

0070278SitarLiquefaction-induced foundation displacement during earthquakes is a major cause of damage to all types of structures. However, evidence from historical events show that improved sites suffer less ground deformation and subsidence than adjacent, unimproved areas. However, as earthquake-engineering moves in the direction of performance based design, the ability to adequately and accurately predict the performance of the foundation elements, including improved ground becomes paramount.The ultimate objective of this research project is to develop a suite of empirical, experimental, and analytical data on the parameters that control seismically induced deformations of improved ground to serve as a rational basis for performance based design. A 2-year program of research incorporating 8 centrifuge experiments at UC Davis National Geotechnical Centrifuge will be conducted. This program of experimental work is aimed at providing some of the much-needed high quality quantitative experimental data. However, since similar work aimed specifically at marine structure and embankments is currently being planned at the Public Works Research Institute (PWRI) and Port and Harbour Research Institute (PHRI) in Japan, there exists a unique opportunity to integrate the parallel studies and obtain the benefits of comparing and evaluating several independent data sets. This project is supported under the 3rd-year competition under NSF 98-36. "US Japan Cooperative Research in Urban Earthquake Disaster Mitigation."