U.S.-Japan Cooperative Research: Impact of Liquefaction on Seismic Lateral Performance of Piles

9315332 Kagawa该奖项支持Wayne州立大学土木与环境工程系Takaaki Kagawa教授与科学技术机构国家地球科学与防灾研究所地震工程实验室的研究人员之间为期三年的合作研究项目。该实验室的两位主要的日本合作研究者是Chikahiro Minowa和Nobuyuki Ogawa。联合研究将首先通过试验(a)在美国进行的模型桩截面试验和(b)在日本进行的振动台试验来调查和澄清桩的侧向土反反应。本研究的目的是开发一种新的方法来评估潜在可液化土壤沉积物中桩基的抗震性能。在历史上的重大地震中，桩基遭受破坏和破坏的主要原因是液化引起的地基土破坏。近年来，人们对孤立桩和群桩的动力特性进行了大量的研究，以增加我们对土桩动力相互作用的认识。然而，这一领域的技术水平还没有发展到可以预测地基土在地震中液化时桩的性能的程度。该联合研究项目将为液化饱和砂中横向土-桩相互作用提供更好的见解，并为潜在可液化土壤沉积物中桩基础的合理抗震设计指南提供基础。＊＊＊

9315332 Kagawa This award supports a three year cooperative research project between Professor Takaaki Kagawa, Department of Civil and Environmental Engineering, Wayne State University, and researchers at the Earthquake Engineering Laboratory, National Research Institute for Earth Science and Disaster Prevention, Science and Technology Agency. The two principal Japanese co-investigators in that laboratory are Chikahiro Minowa and Nobuyuki Ogawa. The joint research will first investigate and clarify the lateral soil-reaction responses of piles through experimental efforts involving (a) model pile-section tests conducted in the United States and (b) shaking-table tests conducted in Japan. The objective of the research is to develop a new methodology for evaluating the seismic performance of pile foundations in potentially liquefiable soil deposits. Pile foundations have experienced damage and failure during major historical earthquakes, due mainly to the failure of foundation soils caused by liquefaction. A number of studies have been conducted in recent years on the dynamic behavior of isolated piles and of groups of piles, to increase our understanding of dynamic soil-pile interaction. The state of the art in this field, however, has not advanced to a point where we can predict the performance of piles when foundation soils undergo liquefaction during an earthquake. This joint research project will provide an improved insight into lateral soil-pile interactions in liquefying saturated sands, and with a basis for developing rational seismic design guidelines for pile foundations in potentially liquefiable soil deposits. ***