In this paper, the cast-in place pile and ground beam subassemblages, using the pile head semi-rigid connection, were tested to investigated their seismic behavior. Test results showed that the pile head connections had the large deformation performance also in the case of subassemblages with practical shapes and bar arrangement details. Additionally, the estimation methods of the bending strength and deformation characteristics of the pile head connection were proposed and verified, and the anchorage performance of main bars of ground beam in the pile cap and the shear cracking strength of the pile cap were discussed.
