반복하중을 받는 하이브리드 프리캐스트 보-기둥 접합부의 성능평가

초록

In this study, new moment-resisting precast concrete beam-column joint made up of hybrid steel concrete was developed and tested. This beam-column joint is proposed for moderate seismic regions. It has square hollow tubular section in concrete column and connecting plate in precast U-beam. The steel elements in column and beam members be connected using bolt. And in order to prevent the premature failure of concrete in hybrid steel-concrete connection, we use the ECC(engineered cementitious composite). An experimental study was carried out investigating the joint behavior subjected to reversed cyclic loading and constant axial compressive load. Two precast beam-column joint specimens and monolithic reinforced concrete joint specimen were tested. The variables for interior joints were cast-in-situ concrete area and transverse reinforcement within the joint. Tests were carried out in displace controlled reversed cyclic load and constant axial load. Joint performance is evaluated on the basis of connection strength, stiffness, energy dissipation, and displacement capacity. Based on the test results, we observed main differences of structural behavior because of different bonding characteristics between steel, concrete and ECC. The proposed joint detail can induce to move the plastic hinge out of the ECC and steel plate. And proposed precast connection show better performance of the monolithic connection by provides the sufficient moment-resisting behavior to be applicable for moderate seismic regions.

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