USACoE: Design of Fiber-Reinforced Polymer Materials for Seismic Rehabilitation of In

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Design of Fiber-Reinforced Polymer Materials for Seismic Rehabilitation of Infilled Concrete Structures

Authors: Ghassan K. Al-Chaar and Gregory E. Lamb
US Army Corps of Engineers
Number Pages: 83
File Size: 1.2 Mb

A recent study by the U.S. Army Engineer Research and Development Center (ERDC), Construction Engineering Research Laboratory (CERL) for the Federal Emergency Management Agency (FEMA) revealed that more than half of the Army buildings located in high or moderate seismic zones did not meet current seismic code requirements and were found vulnerable to damage during an earthquake.
One rehabilitation technique that addresses vulnerabilities in both the masonry infills and in nonductile concrete frames is the use of fiber-reinforced polymer (FRP). ERDC/CERL investigated the effectiveness of such a technique by conducting an experimental program on reinforced concrete (R/C) frames infilled with masonry. Based on this research and related research in the field, this report was developed to provide in-depth guidelines for engineers and practitioners on how to evaluate the strength and stiffness of R/C members and masonry-infilled frames strengthened with FRP.
This document uses the same nomenclature used in ACI 440, Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures, when possible. Major contributions that go beyond ACI 440 include guidance on:
• FRP systems that have nonlinear stress-strain behavior
• flexural strength of R/C members fully wrapped with FRP and containing
compression steel reinforcement
• moment-curvature relationships for beams
• compressive strength of noncircular R/C members
• thrust-moment interaction behavior for columns
• strength and stiffness of masonry-infilled frames with FRP overlay
• global structural system performance evaluation using nonlinear pushover
analysis.

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