Abstract
The seismic performance of reinforced concrete (RC) columns strengthened using steel bar/wire mesh mortar (SWM) was investigated. A comparative experimental study was performed by taking nine RC square columns strengthened with SWM and steel bar mat mortar (SM) under pseudostatic test. The effects of strengthening method and test parameters on the seismic bearing capacity, ductile deformation, and failure mode of all columns were tested and analyzed. The results show that SWM-strengthened columns can experience more cyclic loading times before the failure than SM-strengthened columns under the same axial load ratio, and the energy dissipation capacity and seismic bearing capacity of SWM-strengthened columns were higher on average than that of SM-strengthened columns by 62.3% and 73.66%, respectively, proving that the strengthening method has a good application in engineering practice.
Highlights
The seismic performance of the bottom column in the frame structure directly affects the collapse resistance of the overall structure
The results show that the bearing capacity of the steel bar mat mortar (SM)-strengthened column can be improved effectively, but the ductile displacement is not as large as expected
The meaning of the number 1 in SWM1 is that one wrap of wire mesh was used for strengthening column except for a steel bar mat (Figures 2(c) and 2(h), Table 2)
Summary
The seismic performance of the bottom column in the frame structure directly affects the collapse resistance of the overall structure. The reinforcement ratio of the columns cannot be improved effectively by this strengthening method due to the wire mesh is too thin, and the increase of the bearing capacity of the strengthened columns is limited. To solve the problem of insufficient bearing capacity of columns, Shang et al [9] used small-diameter steel bar mat mortar (SM) to strengthen the columns and carried out study. Based on the above research, it may be a feasible method to use steel bar/wire mesh mortar (SWM) to strengthen the column and improve its seismic performance. The strengthening method of using SWM is intended to improve the ability of the column to resist earthquake damage by increasing the secondary reinforcement ratio of the column and making the concrete in the column under three-direction compression. The influence of test parameters on bearing capacity, ductile deformation, and hysteresis characteristics of nine columns was analyzed in detail
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