| 报告题目: Adaptive Passive Negative Stiffness Systems for Seismic Protection of Base Isolated Bridges 报 告 人：Satish Nagarajaiah. Rice University教授 讲座地点：综合实验三号楼209（二楼会议室） 讲座时间：2015年6月22日9:00—10:30 Professor Satish Nagarajaiah个人介绍： Rice University, Houston, TX 77005, USA Satish.Nagarajaiah@rice.edu 
ABSTRACT Traditionally researchers have focused on supplemental damping systems for earthquake protection. Nagarajaiah group has focused on the development of adaptive/variable stiffness systems for response control. This seminar presents various stages of development of the concept of adaptive/variable stiffness structural systems, in particular application to base isolate bridges. Recently NSF NEES-Adapt-Struct team with Satish Nagarajaiah as PI has focused on the development of supplemental adaptive negative stiffness systems for seismic protection. This seminar presents various stages of development of the concept of adaptive passive negative stiffness achieved through the introduction of supplemental negative and positive tangential stiffness, and the design procedure for implementing it in various structures. The team at Rice University, University at Buffalo, RPI & UCLA funded through the NSF NEES program have developed practical and true negative stiffness system. The seminar presents the invention of the Negative Stiffness Device (NSD) and process that lead to the invention—a creative process of innovation by a team of researchers. Detailed analytical and shake table test results of NSD in a base isolated bridge are presented to show the effectiveness of the new and innovative concept of adaptive negative-positive tangential stiffness which provides significant earthquake protection. Further details of the NEES-Adapt-Struct project can be found at the website View videos of NEES-ADAPT(ive)-STRUCT(ures) project in YouTube RiceDSNG channel. Biosketch: Satish Nagarajaiah is a Professor of Civil and Environmental Engineering at Rice University in Houston, Texas. He is affiliated with the Mechanical Engineering Department, Material Science and Nano-Engineering Department at Rice. His teaching and research interests are in the areas of structural engineering, structural dynamic systems, seismic protection, earthquake engineering, structural control, system identification, structural health monitoring, offshore structures, and applied nanotechnology. His research is funded by the National Science Foundation (NSF), NASA, DOE, AFOSR, ONR, other State, Federal, Private Agencies and Industries. NSF has awarded him the prestigious faculty early CAREER award for innovative research in Adaptive Stiffness Structures (1998). He and his coworkers were awarded the American Society of Civil Engineers (ASCE) Moisseiff award in 2015, for their 2014 Journal of Structural Engineering on Adaptive Negative Stiffness Structural Systems. His editorial activities include service as the Managing Editor of the Journal of Structural Engineering [ASCE International journal] (2011—present), Editor of the Structural Control and Health Monitoring [Wiley International Journal] (2008—present) and Editor-in-chief [North America] of Structural Monitoring and Maintenance [Techno-press International Journal] (2014—present). ASCE Structural Engineering Institute (SEI) elected him as an inaugural fellow in 2012 for his service to structural engineering community. He has served on numerous founded and chaired numerous committees in SEI, EMI, and IASCM on Structural Control and Monitoring. For further details visit his website satishnagarajaiah.rice.edu. |
