El Centro de Investigaciones en Materiales y Obras Civiles (CIMOC) de la Universidad de los Andes tiene el gusto de invitarlos al Seminario de Estructuras con Shirley J. Dyke y Julio A. Ramírez de Lyles School of Civil Engineering de Purdue University.

Por favor confirmar asistencia AQUÍ antes del medio día del martes 14 de marzo (para personas externas a la Universidad de los Andes).

Salón confirmado: ML 513

170315-CIMOC-Dyke-Ramirez

 


Título:

 

Dealing with the Realistic Challenges of Real-time Hybrid Simulation for Structural Evaluation”, Shirley J. Dyke.

Abstract:

Real-time Hybrid Simulation (RTHS) is a novel technique used to examine the global behavior of structural systems that are too large or complex to test in the laboratory. RTHS offers the opportunity for global evaluation of structural systems subject to extreme dynamic loading, typically with a significant reduction in time and cost.  Physical specimens are linked with computational models, and the challenge is to ensure that the combined system is tested under realistic conditions. Thus, boundary conditions at the interface between the physical and computational portions must be enforced, and hydraulic actuators are frequently used. However, the relatively slow dynamics of the actuator and the presence of feedback loops, mean that delays and lags hinder realistic simulations, and thus control is needed. Because the system being examined is not well understood (which is the point of the test), control design must be performed under deep uncertainty. After examining how partitioning influences stability, we have proposed a predictive stability indicator (PSI), as well as a parallel method to examine the performance, or accuracy, of the results of an RTHS called the predictive performance indicator (PPI). The intention is to provide the tools to actually design an RTHS experiment in advance. To deal with the realistic challenges of RTHS, we describe how these tools enable researchers to identify the requirements to perform a successful RTHS test

Ponente:

Dr. Shirley J. Dyke is a professor of mechanical engineering and a professor of civil engineering at Purdue University.  She was born near Chicago, Illinois, USA in 1969. She received her B.S. in Aeronautical and Astronautical Engineering from the University of Illinois, Champaign-Urbana and her Ph.D. degree in Civil Engineering from the University of Notre Dame in 1996.  She was the Edward C. Dicke Professor of Engineering at Washington University in St. Louis until 2009. Professor Dyke teaches courses in structural dynamics, experimental methods and probability. Dr. Dyke was awarded the Presidential Early Career Award for Scientists and Engineers (1998), the Short-term Invitation Fellowship from the Japan Society for the Promotion of Science (1998, 2000), the International Association on Structural Safety and Reliability Junior Research Award (2001) and the ANCRiSST Young Investigator Award (2007). Dr. Dyke’s research efforts have addressed a variety of issues related to the development and implementation of “smart” structures, including innovative control technologies for natural hazard mitigation, and structural health monitoring and damage detection. Dr. Dyke established the Intelligent Infrastructure Systems Lab at Purdue's Bowen Lab.

 


Título:

 

The National Hazards Engineering Research Infrastructure (NHERI) and Its Network Coordination Office (NCO), Julio A. Ramírez.

Abstract:

On July 1, 2016 the Purdue University led team was officially named as the recipient of the Network Coordination Office (NCO) for the NSF­‐sponsored Natural Hazards Engineering Research Infrastructure (NHERI). The Natural Hazards Engineering Research Infrastructure (NHERI) is supported by the National Science Foundation (NSF) as a distributed, multi­‐user national facility that will provide the natural hazards research community with access to research infrastructure. NHERI is comprised of separate research infrastructure awards for a Network Coordination Office (NCO), Cyberinfrastructure (DesignSafe­‐CI), Computational Modeling and Simulation Center, and eight Experimental Facilities, including a post­‐disaster, rapid response research facility (RAPID). Information about the unique capabilities of these facilities can be found at: https://www.designsafe­‐ci.org/facilities/experimental/ 

 

This Purdue­‐led Network Coordination Office (NCO) center: (a) serves as a focal point and leader of a multi­‐hazards research community focused on mitigating the impact of future earthquakes and windstorms, and related hazards such as tsunamis and storm surge on our nation's physical civil infrastructure; (b) leads education and outreach activities; (c) works with our partner NHERI Experimental Facilities to ensure the efficient testing and user support within a totally safe environment. We will centrally coordinate the schedule and facilitate shared technical knowledge and best practices among the Experimental Facilities; and (d) develops strategic national and international partnerships and coordinates NHERI activities with the other awardee components to form a cohesive and fully integrated global natural hazards engineering research infrastructure that fosters collaboration in new ways. In this presentation, NHERI is described and the NCO key planned activities in Year­‐1 are discussed.

Ponente:

Dr. Julio A. Ramirez is a Professor of structural engineering in the Lyles School of Civil Engineering of Purdue University. He is the Principal Investigator and Center Director of the Network Coordination Office (NCO) of the NSF funded Natural Hazards Engineering Research Infrastructure (NHERI). Dr. Ramirez is a voting member of the technical Joint Committee ACI­ASCE 445, Shear and Torsion; and ACI­ASCE Committee 408, Bond and Development of Reinforcement. He served as the chief officer for the George E. Brown Jr. Network for Earthquake Engineering Simulation (NEES) during the period of October 2009 to September 2015. He has served as an Associate Editor for the Committee on Concrete and Masonry Structures (CCMS) Division of the American Society of Civil Engineers (ASCE) Structural Journal and has been a member of several National Cooperative Highway Research Program (NCHRP) research panels. Prof. Ramirez has served in NSF proposal review panels for several directorates. Dr. Ramirez is a Fellow of the American Concrete Institute and the recipientof the 2000 Delmar Bloem Award and the 2006 Joe W. Kelly Award of the American Concrete Institute.

For the past 30 years Prof. Ramirez has been teaching and conducting research in structuralengineering. His areas of expertise cover design, evaluation of performance and code development of reinforced and prestressed concrete bridges and buildings. Since 1994, Prof. Ramirez has been involved in eight­reconnaissance missions following the earthquakes of Northridge CA, Manzanillo Mexico, Kobe Japan, Duzce­Bolu Turkey, Puebla Mexico, Armenia Colombia, and Bingol Turkey. The goal of these missions was to gather perishable data on the performance of reinforced and prestressed concrete bridges and buildings immediately following major earthquakes in what constitutes a major real life and very costly test of the built environment in order to synthesize lessons that could help mitigate the impact of earthquakes on society. He was also engaged as project Co­PI in the recently completed NSF funded study “Mitigation of Collapse Risk in Vulnerable Concrete Buildings” aimed at identifying collapse triggers in non­ductile reinforced concrete buildings subjected to seismic actions. Dr. Ramirez has also led the training of personnel for the post­earthquake safety evaluation of bridges for the Indiana Department of Transportation, and the identification of emergency routes for the state. He has collaborated with the Indiana State Management Agency (SEMA) in efforts to establish of a volunteer coalition to assist the Indiana Department of Homeland Security in the condition assessment of buildings after a natural or man­made disaster. His research work in the area of bond of mild reinforcement and prestressing strand in high­strength concrete has been widely referenced and serves as the basis for the extension of the AASHTO LRFD Specifications on development of mild reinforcement and prestressing strand to higher strength concretes. 

Fecha: Miércoles 15 de Marzo, 2017 
Hora: 11:00 am - 12:30 am 
Universidad de los Andes - Salón ML 513