FRP as Delegated Design: How to Specify, Coordinate, and Control Performance
AIA Course No. SKA0205 | 1 LU|HSW
Fiber-Reinforced Polymer (FRP) composites are widely used for structural strengthening and retrofit of existing concrete structures due to their high strength-to-weight ratio, constructability, and minimal impact on building operations. However, successful implementation of FRP strengthening systems requires careful coordination among the Project Design Team Structural Engineer of Record (SER), FRP specialty engineer, contractor, and inspection team, as well as a well-defined quality assurance and quality control (QA/QC) program.
This program provides architects and design professionals with an overview of externally bonded FRP strengthening systems and the critical coordination considerations that govern their performance and durability. The presentation discusses common FRP materials and systems, typical strengthening applications, and factors influencing system selection, including existing conditions, exposure, occupancy, and constructability constraints.
The program emphasizes the importance of clearly defining delegated design responsibilities, developing appropriate FRP design specifications, and reviewing submittals and shop drawings to ensure compliance with ACI 440 guidelines and project-specific performance requirements. Participants are also introduced to recommended inspection and testing protocols, including surface preparation verification, pull-off testing, witness panels, and field observation practices, highlighting the limitations of over-reliance on isolated test results.
Finally, the presentation addresses maintenance and durability considerations such as fire protection, environmental exposure, and long-term protection of installed FRP systems. Through this discussion, participants gain a practical understanding of how coordinated design, documentation, and inspection efforts help mitigate risk, protect public safety, and achieve reliable structural strengthening outcomes.
Learning Objectives
- Describe common externally bonded FRP strengthening systems and explain the factors that influence their selection and application in structural retrofit projects.
- Identify the respective roles and responsibilities of the Structural Engineer of Record, FRP specialty engineer, and contractor in delegated FRP design and construction.
- Explain key components of FRP design specifications, submittal requirements, and shop drawing reviews necessary to verify conformance with ACI 440 and project performance criteria.
- Evaluate quality assurance, inspection, and testing practices for FRP installations, including their limitations, to support safe, durable, and code-compliant strengthening systems.
