Title:
Modeling Material Response of Fiber Composites used for the Retrofit of Existing Concrete Structures under Blast Loadings
Author(s):
Sary A. Malak and Neven Krstulovic-Opara
Publication:
Symposium Paper
Volume:
340
Issue:
Appears on pages(s):
114-136
Keywords:
ductility, rotation, high-performance concretes, blast pressures, blast impulse, steel fibers, ultimate resistance, mitigation, threat
DOI:
10.14359/51725809
Date:
4/1/2020
Abstract:
This paper provides an overview of simplified methods for dynamic blast analysis of structural members. The presented approach focuses on the use of a general simplified non-linear single degree of freedom dynamic model commonly used for typical flexural members such as slabs, beams or columns. The presented approach also allows modeling of members retrofitted against blast loading using fiber composites. The fiber composites considered in this paper include conventional Steel Fiber Reinforced Composites (FRC) as well as High Performance Fiber Composites (HPFRC). HPFRC’s include Short Steel Slurry Infiltrated Concrete (SIFCON), Long Continuous Slurry Infiltrated Steel Fibers Mat Concrete (SIMCON), and Fiber Reinforced Polymers (FRP). The model identifies different material parameters that affect the response of the structure. The effect of the material properties on the composite response is discussed within the framework of the existing blast-resistance guidelines and standards. Different retrofit techniques for existing concrete structures using fiber reinforced composites and the effect of varying the composite material properties on the response is presented. Final conclusions and recommendations are provided in terms of composite material’s properties, modeling performance and response. Specific limitations on their use is also discussed.
Related References:
1. Baker, Wilfred E., Wilfred Baker Engineering, “Explosions in Air” published 1973 by University of Texas Press in Austin
2. Biggs John, M., Introduction to Structural Dynamics, McGraw-Hill Publishing Company, Published 1964-06-01
3. Abdollahi,B., et al, “SIFCON Strengthening of Concrete Cylinders in Comparison with Conventional GFRP Confinement Method”, Elsevier Construction and Building Materials, 2012, pp.765-778
4. Krstulovic-Opara, N., Malak, S., “Tensile Behavior of Slurry Infiltrated Mat Concrete (SIMCON)”, ACI Materials Journal, 1997, pp.39-46
5. Lim, T.Y., Paramasivam, P., Lee, S.L.,”Analytical Model for Tensile Behavior of Steel-Fiber Concrete”, ACI Materials Journal, 1987, pp286-295
6. Fujikake, K. et al, “Analytical Model for Concrete Confined with Fiber reinforced polymer Composite” Journal of Composites for Construction @ ASCE, 2004, pp.341-351
7. Naaman, Antoine., E.,Homrich, Joseph R., ”Tensile Stress-Strain Properties of SIFCON”, ACI Materials Journal,1989, pp.244-251
8. 440.2R-08, Report on Fiber-Reinforced Polymer (FRP) Reinforcement for Concrete Structures, Reported by ACI Committee 440
9. PDC-TR 06-08, US Army Corps of Engineers Protective Design Center Technical Report, ”Single Degree of Freedom Structural Response Limits for Antiterrorism Design”, 7 January 2008
10. ASCE, SEI, “Structural Design for Physical Security State of Practice” Conrath Edward J., Krauthammer Ted, Marchand Kirk A., Mlakar Paul F.