earticle

영어

This study proposes a novel seismic strengthening system of reinforced concrete (R/C) frame infilled using Precast Modular Reinforced Blocks (PMRB) to improve the drawbacks of conventional infilling techniques. The retrofitting system for R/C frame infilled with PMRB maximizes the advantages of factory-produced modular reinforced blocks, significantly improving the constructability and integrity of the connections between the existing frame and the reinforced blocks. This method does not significantly increase the weight of the structure due to seismic retrofitting and is a typical frame-infilling method to increase lateral-load capacity. A pseudo-dynamic test was accomplished using a full-scale two-story frame specimen based on an existing R/C building with non-seismic details to verify the strengthening effects of the PMRB frame-infilling system such as restoring force characteristics, strength increasing effects, and seismic response control capabilities. Under a design basis earthquake with a seismic intensity of 200 cm/s², the unreinforced R/C frame experienced shear failure, while the PMRB-reinforced frame was expected to sustain only minor earthquake damage. Even when considering a maximum considered earthquake of 300 cm/s² and a large-scale earthquake of 400 cm/s², only small or less damage was anticipated. Therefore, the seismic reinforcement effectiveness of the newly developed PMRB frame-infilling system has been verified in this study.