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

9315332香川 该奖项支持韦恩州立大学土木与环境工程学系的香川教授与科学技术厅国家地球科学与灾害预防研究所地震工程研究室的研究人员之间为期三年的合作研究项目。 该实验室的两名主要日本合作研究人员是Chikahiro Minowa和Nobuyuki Ogawa。 这项联合研究将首先通过实验工作，包括（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，调查和澄清桩的横向土壤反应反应。 研究的目的是开发一种新的方法来评估潜在的可液化土壤沉积物中桩基的抗震性能。 在历史上的大地震中，桩基经历了损坏和失效，主要是由于液化引起的地基土失效。 近年来，人们对单桩和群桩的动力特性进行了大量的研究，以加深对土-桩动力相互作用的理解。 然而，该领域的最新技术还没有发展到我们可以预测地震期间地基土液化时桩的性能的程度。 这一联合研究项目将提供一个更好的了解横向土桩相互作用在饱和砂土，并为制定合理的抗震设计准则的基础上，桩基础在潜在的可液化土壤沉积。 ***

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. ***