Seismic Performance Analysis and Design of Fiber Reinforced Polymer Composites (FRP)-Retrofitted Infill Walls in Reinforced Concrete Frames of a DepEd School Building
Abstract
In this study, the seismic behavior and cost efficiency of FRP-retrofitted masonry infills in a two-story DepEd classroom frame (occupancy Group C, 7m x 4.5m modules) were analyzed. The comparative parametric numerical analysis program was done using the computer software MIDAS FEA NX considering component (solid and openings), as well as structural system (classroom frames) level analysis under nonlinear pushover loading conditions accounting for masonry cracking, frame-infill interaction, interface slip, FRP bond, and anchorage effects. The structural comparisons were pre-damage comparisons; the direct costs of demolition-and-reconstruction versus FRP repair and steel strengthening served as the post-damage benchmarks for the study. FRP was found to increase the peak lateral strength of solid-wall systems by 48.0% (FRP-X-35) and 58.7% (FRP-G-45) and opening-wall systems by 58.7% and 80.4% correspondingly. In terms of system-level response at the 7 m direction, the increase in peak base shear was 42.4% to 52.2% whereas maximum interstory drift ratio decreased by 35.2% to 42.6%; the more flexible 4.5 m direction dominated. The parametric analyses revealed that the performance of the systems depended on the layout, anchorage and bond quality; with a coverage ratio of 28–34% providing optimal results and poor bonding decreasing the capacity by approximately 42% to 28%. An anchored Hybrid-X CFRP option was found to be the most cost-efficient with the indices of PHP 411 per one percent increase in base shear and PHP 495 per one percent decrease in drift.
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