FRP Design Methodology and Applications for Blast and Impact-Resistant Structures-Update on the “Blast Design Guidelines for Externally Bonded FRP Applications” Standard (PDF)

Update on the “Blast Design Guidelines for Externally Bonded FRP Applications” Standard (PDF)

Pdf Summary

The "Blast Design Guidelines for Externally Bonded FRP Applications" is a collaborative project developed by ACI 370, which focuses on blast and impact load effects, and ACI 440F, which specializes in FRP repair and strengthening. The guidelines are intended to assist in designing concrete and masonry wall panels, which are reinforced with fiber-reinforced polymer (FRP) to withstand blast loads.<br /><br />The document outlines several key chapters, starting with an introduction that provides a historical review of FRP systems dealing with blast loading, the scope, and limitations of the document. It clarifies that the guidelines focus on out-of-plane flexural upgrades and consider FRP as additional tensile reinforcement. Following chapters cover constituent materials and properties of FRP, including their physical and mechanical attributes, durability, and qualifications needed for construction.<br /><br />Blast analysis and design principles are detailed, highlighting differences from conventional design, such as increased dynamic strength and plastic deformation allowances. The guidelines discuss using an equivalent mass-spring system for analysis, considering effects of damping, and expounding on connection design with factors of safety.<br /><br />Subsequent sections address dynamic material properties, notably accounting for strain-rate effects which enhance the strength of concrete, masonry, and steel, but not FRP. An equivalent SDOF model is proposed for retrofitting RC and masonry panels with FRP, factoring in stiffness, resistance, and the potential for FRP debonding.<br /><br />Design examples are provided for increasing the flexural capacity of reinforced concrete and unreinforced masonry walls subjected to blast loads. These examples also cover the application of FRP on either one or both sides of the wall and detail necessary reinforcement strategies.<br /><br />Questions and further comments can be directed to Jason Florek at Stone Security Engineering.

Keywords

Blast Design Guidelines

Externally Bonded FRP

ACI 370

ACI 440F

FRP reinforcement

Concrete and masonry

Blast loads

Dynamic material properties

SDOF model

Flexural capacity