FE Analyses for Developing Retrofit Concepts under Extreme Dynamic Environments

ABSTRACT:

The primary objective of a mitigation design is to prevent substantial deformation of structural elements in hopes of preventing structural collapse, progressive collapse and damage and, thus, reducing loss of life. Mitigation scheme options are depended on the type and construction of a structure. In this particular presentation, we'll restrict ourselves to multistory structures of typical steel and concrete construction practice.

Mitigating the effects of closed-in detonations to prevent breach alone is a formidable task. Past evaluations of mitigation designs involved absorbers and sacrificial barriers as well as facade and internal hardening options. Selecting a blast mitigation design, however, to reduce the effects of closed-in detonations traditionally addresses only the pressure and impulse loading effects on the facade of the structure under consideration. Secondary effects which are overlooked involve the build up of internal pressures and debris loading. Specialized experimental setups were designed to study these secondary effects.

This presentation exposes some of these issues and provides insights as to potential remedies to the problems stated earlier. Experimental measurements and numerical analyses are shown to compare the robustness of the current FE codes when used as predictive tools.

BIO

Dr. Papados education includes a BS in Civil Engineering (CE), a MS in CE/Structures, and a PhD in Computational and Applied Structural Mechanics..

Dr. Papados is currently a Senior Research Engineer for the Department of Defense (DoD). He has been involved primarily in military project since 1993 and a major portion of his work is classified. Management of new projects and maintenance of existing ones is part of his tasks.

Prior to his current position, Dr. Papados was a Research Structural Engineer with the U. S. Army Engineer Research and Development center. Portion of his work involved high fidelity large-scale computations to enhance counter terrorist measures for a variety of high profile structures. He was also involved in code development and validation.

While Dr. Papados was with the U. S. Army Research Laboratory the emphasis of his work rested on the enhancement of the current scalable software, improvement of constitutive modeling, and improvement of mesh generation methods suited for parallel machines as well as the development of new programs under the auspice of the DoD.

Dr Papados served with the Waterways Experiment Station between June, 1993 and May, 2000. His main duties included development, coordination, and completion of blocks of large scope of work. Areas of involvement included constitutive modeling, massively parallel code implementation, and development, implementation, and benchmarking of explicit FEA codes on scalable machines under the Common High Performance Computing Software Support Initiative (CHSSI).

Dr. Papados served as adjunct professor, visiting professor and assistant professor at a number of universities. He belongs to several national and international organizations. He is the authors of an excess of 120 publications and technical reports. He has taught several mini workshops and has delivered more than 200 speeches. He is the recipient of several awards, honors, and scholarships both at the national and international level. He has served as session chair/co-chair and as selection committee member for International conferences and workshops.