Polyurea Coated and Plane Reinforced Concrete Panel Behavior under Blast Loading: Numerical Simulation to Experimental Results
Journal Title: Trends in Civil Engineering and its Architecture - Year 2018, Vol 1, Issue 4
Abstract
This research investigated the behavior of reduced scale standard reinforced concrete panels coated with various polyurea systems under blast loading. The blast mitigation performance of four coatings including two plain polyureas and two discrete fiber-reinforced polyurea (DFRP) systems was evaluated. Chopped E-glass fibers were discretely integrated in with the polyurea to develop a DFRP system. The addition of glass fiber to a polymer coating provides improved stiffness and strength to the composite system while the polyurea base material provides ductility according to a fiber length optimization study conducted by Carey and Myers (2011) [1]. Reduced scale panel blast testing was conducted. In addition, the finite element program LS-DYNA was used to model panel and coating response under blast loading. Several modeling solutions were undertaken and compared for concrete formulation. Winfrith concrete material, model and Surface Cap model, which are widely used to simulate the concrete behavior under dynamic loading, were examined. Modeling results were analyzed and compared to the experimental work to validate the conclusions. Research initiatives have been advanced to investigate new materials that can be used for blast mitigation, strengthening, or for general repair-retrofit applications. This research activity focused on assessing the effectiveness of various blast mitigation coating technologies to be used for enhancing the blast resistance of structural members. This study examined the behavior of reduced scale standard reinforced concrete (RC) panels coated with various polyurea systems under blast loading. The finite element program LS-DYNA was used to model panel impact resistance under blast loading using the explicit time integration in order to compare to the experimental work to validate the conclusions. The blast mitigation performance of four coatings including two plain polyureas and two discrete fiber-reinforced polyurea (DFRP) systems was assessed. Chopped E-glass fibers were discretely integrated in with the polyurea to develop a DFRP system. The addition of glass fiber to a polymer coating provides improved stiffness and strength to the composite system while the polyurea base material provides ductility [1]. This study builds on previous work investigating the blast mitigation performance of hybrid, plain, and steel fiber- reinforced concrete panels coated with various polyurea systems under blast loading [2]. The results of the blast testing revealed that the addition of plain polyurea or DFRP system on the tension side improved panel performance by containing spalling during a blast event. DFRP systems exhibited less bulging compared to the plain polyureas due to higher stiffness. Previously, the polyurea retrofit approach for blast mitigation and impact resistance was investigated by conducting testing on masonry walls [3-10], vehicle barriers [11,12], and reinforced concrete panels [12-14]. Polyurea coating exhibited ductile behavior and was effective at containing spalling and reducing fragmentation during either blast or impact testing. Other Studies examined the effectiveness of the system to provided added shear and flexural capacity [15].
Authors and Affiliations
Natalia L Carey, John J Myers, Domenico Asprone, Costantino Menna, Andrea Prota
Keywords
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- EP ID EP605083
- DOI 10.32474/TCEIA.2018.01.000119
- Views 66
- Downloads 0
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