This study examined the ductile behavior of hybrid steel-reinforced concrete beam systems under reversed cyclic lateral loads. All specimens showed a high ductile performance with the displacement ductility ratio of more than 4.6, regardless of the details of dowel reinforcement at the joint region of the developed hybrid beam system.

In this study, the seismic performance of weak-axis column-tree moment resisting frame was experimentally investigated using RBS conception. As a result, two specimens were showed that enough energy dissipation and plastic rotation capacity. But bolt-slip didn’t happen anymore after story drift ratio of 3%.

In this study, the seismic performance of weak-axis steel moment connections was investigated through cyclic testing of two full-scale specimens by reducing flange plate thickness. As a result, two specimens were showed that enough energy dissipation capacity and ductility.

In the construction of nuclear power plants using massive walls in Korea, the use of high-strength re-bars for shear design is necessary to enhance the constructability and economy. In the present study, low-rise walls(aspect ratio = 1.0) with 550MPa grade bars, were tested under cyclic loading to investigate shear capacity and deformation capacity of the walls. The results were compared with the performance of walls with grade 420 bars and predictions by current design code. The test results showed that ACI 349 underestimated the shear strength of the walls with 550 MPa grade bars. This result indicated that the ACI 349 predictions can be safely used for the earthquake design of the low-rise walls (aspect ratio =1.0) with 550 MPa grade bars.