Avoiding Disproportionate Collapse

Single Abstract

340978 - Response of reinforced and sandwich concrete panels subjected to projectile impact

Friday, April 20
11:00 AM - 12:30 PM
Location: 202CD

The ballistic performance of cementitious materials against high-speed hard projectile is a highly complex problem as compressive shock waves followed by reflected tensile waves cause brittle tensile failure and spalling. Conventional finite element modeling does not provide accurate results due to large deformation of the elements. This issue could be addressed by introducing element erosion or Smooth Particle Hydrodynamics (SPH) method. In this study, the structural performance of steel-concrete-steel (SCS) sandwich and reinforced concrete panels under high-speed missile impact are assessed using ABAQUS\Explicit package. The panels are frequently used in nuclear structures and they are expected to maintain an acceptable level of safety even in extreme loading scenarios such as airplane crash. The two configurations for panels are compared in terms of penetration depth and rear deformation and validated with the experiments and empirical equations. Local and global failure mechanisms including bending and crack patterns as well as local effects such as punching and penetration are studied. Strain rate effect for the concrete and steel parts is considered via dynamic increase factor and rate dependent constitutive models. Several criteria for the element failure and element erosion are investigated to capture the accurate penetration depth. Furthermore, the accuracy of the SPH method in predicting the penetration depth is compared with the element erosion method. The advantages and modeling issues for each method are discussed. The results showed that the front steel plate is more effective in minimizing penetration depth and it can enhance the overall protection of the structure.

Bora Gencturk

Assistant Professor
University of Southern California

Dr. Bora Gencturk is an Assistant Professor in the Sonny Astani Civil and Environmental Engineering Department at the University of Southern California (USC). He obtained his Ph.D. and M.S. degrees from the University of Illinois at Urbana-Champaign and his B.S. degree from Bogazici University (Istanbul, Turkey). Prior to joining USC, he was an assistant professor at the University of Houston for five years (2011-2016). Dr. Gencturk’s technical interests are in the broad fields of extreme event resilience and sustainability of civil infrastructure. He has received both young investigator awards given by the U.S. National Science Foundation (NSF): Faculty Early Career Development (CAREER) and Broadening Participation Research Initiation Grant in Engineering (BRIGE). He has produced over 40 refereed journal papers, three book chapters, six research reports, and more than 40 conference papers. He teaches courses on mechanical behavior of materials, structural dynamics, earthquake engineering and structural reliability. He is a member of ASCE, the American Concrete Institute, and the Earthquake Engineering Research Institute.

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Kaspar Willam

Hugh Roy and Lillie Cranz Cullen Distinguished Professor
University of Houston

Research in computational failure mechanics, finite element analysis, interface modeling, mechanics of materials, plasticity, elastic damage, poromechanics, thermohydromechanics, localization analysis of cohesive-frictional materials, thermal degradation of concrete materials, seismic response of masonry infill walls.

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Mohammad Hanifehzadeh

University of Southern California

n/a

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