FRP Design Methodology and Applications for Blast and Impact-Resistant Structures-Blast Design Methodology for FRP Upgrades to Masonry and Reinforced Concrete Walls in the SBEDS Program (PDF)

Blast Design Methodology for FRP Upgrades to Masonry and Reinforced Concrete Walls in the SBEDS Program (PDF)

Pdf Summary

The document summarizes a presentation from the ACI Spring 2018 Convention in Salt Lake City, concerning blast design methodologies for Fiber Reinforced Polymer (FRP) upgrades to masonry and reinforced concrete walls using the SBEDS (Single-Degree-of-Freedom Blast Effects Design Spreadsheet) v5.0. The SBEDS tool, developed by the U.S. Army Corps of Engineers, is used to simulate blast effects and evaluate the efficacy of structural retrofitting using FRP composites.<br /><br />FRP composites consist of high-strength fibers embedded in a resin matrix, offering high strength and stiffness, though they exhibit limited ductility. The SBEDS methodology includes computations to determine the resistance function, which accounts for material properties such as yield strength and modulus of elasticity, for both concrete and masonry components retrofitted with FRP. The spreadsheet also compares Single-Degree-of-Freedom analysis results with empirical test data to validate the response criteria developed.<br /><br />Shock tube tests were conducted by BakerRisk to evaluate RC and masonry walls reinforced with various types of FRP, including Carbon Fibers (CFRP), E-Glass Fibers (GFRP), and Aramid Fibers (AFRP). The tests assessed parameters such as maximum deflection and peak dynamic reactions, revealing a Calc/Meas ratio close to 1.0, suggesting accuracy in the methodology.<br /><br />Proposed design response criteria are based on ductility ratios, establishing damage levels from minor to catastrophic failure. The response criteria are conservative, taking into consideration observed test data, and suggest maximum ductility for preventing shear failure.<br /><br />The presentation notes that further testing could refine the models and that the methodology has been integrated into the SBEDS tool. The work was a collaborative effort involving organizations like the Protective Design Center, BakerRisk, and various other industrial entities, and the findings contributed to the development of design guidelines by an ACI subcommittee.

Keywords

ACI Spring 2018 Convention

blast design methodologies

Fiber Reinforced Polymer

SBEDS v5.0

U.S. Army Corps of Engineers

shock tube tests

Carbon Fibers

design response criteria

Protective Design Center

structural retrofitting