강관 슬리브 철근이음에서 SD500 철근과 충전 모르타르 사이의 부착 특성

초록

The purpose of this study is to investigate the bond characteristics between SD500 reinforcing bar and grout mortar in steel pipe splice. To accomplish this objective, totally 6 full-sized specimens were made and tested under the monotonic and cyclic loading. All specimens were instrumented with strain gauges at the strategic locations of sleeve and reinforcement. The experimental variables adopted in this study include development length of reinforcing bar, size of reinforcement and loading method, among others.The followings were found:1) With the increase of load applied to the specimen, the overall change of bond characteristics between reinforcing bar and mortar was similar to the existing test result. For typical example, bond stress between i～(i+1) range increased suddenly and was highest when the reinforcement yielded in i location. 2) The bond stress between the sleeve end and the position 1.0d apart from the end appeared to be lower from low load stage, compared with the inner locations of the sleeve. 3) The bond stress between reinforcement and mortar appeared to increase with the decrease of the development length of reinforcing bar, when the load of specimen reached its highest level.

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