Performance of Improved Ground under Strong Seismic Loading

强震荷载下改良地基的性能

• 批准号: 0070278
• 负责人: Nicholas Sitar
• 金额: $ 22.5万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-06-01 至 2003-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0070278&HistoricalAwards=false
• 关键词: Performance; Improved; Ground; under; Strong

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."

0070278Sitar 地震期间液化引起的地基位移是所有类型结构损坏的主要原因。 然而，历史事件的证据表明，经过改良的场地比邻近的未改良地区遭受的地面变形和沉降要少。 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（包括改良地面）性能的能力变得至关重要。该研究项目的最终目标是开发一套经验、控制改良地面地震引起变形的参数的实验和分析数据，可作为基于性能的设计的合理基础。 将在加州大学戴维斯分校国家岩土工程离心机进行为期 2 年的研究计划，其中包括 8 项离心机实验。 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，由于日本的公共工程研究所 (PWRI) 和港湾研究所 (PHRI) 目前正在计划专门针对海洋结构和堤坝的类似工作，因此存在一个独特的机会来整合并行研究并获得比较和评估几个独立数据集的好处。 该项目得到 NSF 98-36 第三年竞赛的支持。 “美日城市防震减灾合作研究”。