Blast Resistant Design

Full Session with Abstracts

338132-8 - Advanced simulation of blast response of reinforced concrete slabs with varying material strength

Saturday, April 21
10:00 AM - 11:30 AM
Location: 202CD

Understanding the behavior of structural elements under severe loading conditions is essential for the adequate design of military and civilian structures to resist blast effects. This paper focuses on predicting the dynamic responses of reinforced concrete slabs subjected to impulsive loading using an innovative numerical simulation technique. Experimental responses of one-way reinforced concrete slab specimens were obtained from a testing program sponsored by the NSF, ACI-447 & ACI-370 committees, Structure-Point and UMKC/ SCE. The program was completed at the Blast Loading Simulator (BLS) at the ERDC/ USACE, Vicksburg, MS and considered two classes (i.e. Normal and High) of strength for concrete and steel reinforcement. Our research utilized the Applied Element Method (AEM) implemented in the Extreme Loading for Structures software (ELS) to simulate the nonlinear dynamic responses and to predict the failure patterns of the investigated slab specimens. Maximum and residual displacement responses and cracking patterns obtained from ELS were compared to simulation results predicted by LS-DYNA and to recorded test measurements. In general ELS predictions were found to be in agreement with test measurements and were deemed to have sufficient practical accuracy. It was concluded that the computationally efficient AEM simulations are advantageous for pre-test predictions and for detailed blast-resistant design applications. Keywords: Simulation; Blast; response; Reinforced Concrete; AEM; ELS; LS-DYNA

Tarek H. Kewaisy

Principal Associate
Louis Berger

Dr. Kewaisy works at Louis Berger office in Washington DC. As a Principal Associate in charge of Protective Design, he leads engineering efforts focused on Design for Blast & Impact Effects and Design for Anti-terrorism & Force Protection. His research interests include Structural Dynamics, Earthquake and Wind Engineering, and Blast & Impact Effects. Dr. Kewaisy is a licensed Professional Engineer (PE) in VA and has more than 28 years of professional experience in Structural Engineering Consulting including: Structural and Finite Elements Analysis, Design of Reinforced & Post-Tensioned Concrete Structures, Design of Steel Structures, Seismic Design of Buildings, and Design of Foundations. Dr. Kewaisy is an active member of the ASCE, AISC, ACI and is currently serving on the ASCE "Blast Shock and Impact" Committee and the ACI-370 Committee on “Blast and Impact Load Effects”. He served as an Adjunct Professor at George MAson University (GMU) and is currently certified as a Project Management Professional (PMP).

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