Abstract
Four groups of specimens of damaged RC columns reinforced by winding steel wire were tested for axial compressions. One group was undamaged RC columns; the others were damaged RC columns, the width of crack developing was regarded as damage index, they were respectively 0.3mm, 1.0mm and 1.5mm, the helically-wound method was adopted for reinforcement, and winding spacing was 50mm. The testing results showed that under reinforcement the load of damaged columns improved a bit in comparison with undamaged ones, but with a little range, however, the strain of longitudinal reinforcement, stirrup and concrete could improve greatly, which indicated that it had a good effect to reinforce the damaged columns by winding steel wire, meanwhile, the ductility of damaged columns was improved apparently.
Highlights
RC columns are most important and widely used load-bearing members in buildings, if the damage occurs in RC columns, which will affect severely the bearing capacity and normal use of buildings
For the reinforcement effects of damaged RC columns by winding steel wire, 12 specimens of RC columns are adopted for axial compressions test, in which three specimens are used for comparison, nine specimens are reinforced by winding steel wire, the width of crack developing is regarded as damage index, the indexes are appointed respectively as 0.3mm, 1.0mm and 1.5mm, through the axial compression test, the bearing capacities of RC columns, the strains of bars and concrete under different damages are compared, the reinforcement effects by winding steel wire are explored from load-bearing and ductility, the testing can provide references for practical engineering in the utilization of reinforcing technology by winding steel wire
When releasing the steel wire rope, it could be found that concrete was broken and in loose condition, there dropped the concrete over large areas, and the longitudinal bars were exposed
Summary
RC columns are most important and widely used load-bearing members in buildings, if the damage occurs in RC columns, which will affect severely the bearing capacity and normal use of buildings. For the reinforcement effects of damaged RC columns by winding steel wire, 12 specimens of RC columns are adopted for axial compressions test, in which three specimens are used for comparison, nine specimens are reinforced by winding steel wire, the width of crack developing is regarded as damage index, the indexes are appointed respectively as 0.3mm, 1.0mm and 1.5mm, through the axial compression test, the bearing capacities of RC columns, the strains of bars and concrete under different damages are compared, the reinforcement effects by winding steel wire are explored from load-bearing and ductility, the testing can provide references for practical engineering in the utilization of reinforcing technology by winding steel wire
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