반복하중을 받는 철근콘크리트 연결보에서 강섬유의 보강효과에 관한 연구

초록

In this study, four reinforced concrete coupling beams were subjected to cyclic lateral loading test to evaluate the structural performance ofcoupling beam according to volume fraction of steel fiber. For this purpose, the volume fraction of steel fiber(0%, 1%, 2%) and transversereinforcement spacing were determined as the main parameter. According to the test results, the maximum strength of D-40C-s100-0 was1.15, 1.13, 1.05 times higher than D-40C-s300-0, D-40C-s300-1, D-40C-s300-2, respectively. The maximum strength of coupling beams withmitigated rebar details increases as the volume fraction of steel fiber increases. Although steel fiber 2% reinforced specimen(D-40C-s300-2)did not satisfy the amount of transverse reinforcement required for seismic design of coupling beam, the overall performance including tomaximum strength, ductility and energy dissipation capacity was similar to the control specimen(D-40C-s100-0). As a result, the use of steelfiber with 2% reinforcement can partially replace the transverse reinforcement in diagonally reinforced concrete coupling beam.

키워드