SEISMIC STRENGTHENING OF RIGID FRAME BY FERROCEMENT WITH EXPANDED METAL MESH AND EXTERNAL FLEXURAL REINFORCEMENT
DOI:
https://doi.org/10.55766/sujst8078Keywords:
Seismic strengthening, Ferrocement, Reinforced concrete frame, Expanded metal, External reinforcementAbstract
Typical low rise commercial buildings are often damaged due to the soft-story effect under earthquake loading. Failure modes include flexural and shear failure at the ends of columns. To improve the flexural strength of the rigid frame, an analytical model to predict the lateral resistance of the strengthened frame was proposed. The study focused on the strengthening of the RC column with expanded metal and external longitudinal reinforcement and the strengthening of the beam-column joint. The specimens were subjected to the axial vertical load and the lateral load. A single-story, single-bay frame was selected as the prototype. Two sets of specimens were prepared to the full scale. The experimental program consisted of two types of test specimens: (1) a bare reinforced concrete (BF) frame as the control and (2) a reinforced concrete frame strengthened with ferrocement (BFS). The experimental results showed that the BFS specimen exhibited significant improvements in the lateral load capacity, stiffness, and ductility with 119%, 110%, 47%, respectively greater than the original frame. The structural performance enhancements are attributed to the respective contributions of ferrocement layer strengthening (22%), external reinforcement (45%), and the original column’s inherent moment resistance (33%), as derived from the total moment capacity. The lateral resistance resulting from the laboratory test and the analytical model showed a difference of 2.48%, indicating an acceptable prediction. The test results were also compared with the results of numerical analysis using the nonlinear structural analysis by the RUAUMOKO software. The results were found to be in good agreement.
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