As building height is increasing, the pile foundation has become popular. Pile foundation can be divided into CIP(Cast-In-Place) concrete pile and precast pile. To overcome disadvantages of CIP concrete pile, precast pile usage was studied. The quality of precast pile can be controlled easily, conserve materials, and production period is into 1~2days while its axial load can remain high. Thus, this study focused on the PHC Pile which is the most commercialized precast product. The developed half-sphere shaped joint is named HAT Joint(Hollow hAlf-sphere cast-sTeel Joint). HAT Joint has different force flow from other joints. The shape of HAT Joint has advantage over the force flow by forwarding the upper load to pile only with impression force, and can be simply installed by bolt-connection. Also it can be applicated in Top-Down construction area instead of CIP concrete pile by setting up the ''PHC pile-HAT joint-Steel column'' at once.
Several types were developed based on the shape of steel column. All joints were designed for 1000mm PHC pile. The first joint type for H-column is named H-type. The Joint for built-up column(K-type), tube column(T-Type), and pipe column(P-Type) was additionally developed. Objected load for HAT Joint is 1500ton that 1.5 times for safety of 967ton; allowable compressive stress of Φ1000 PHC pile. FEM Analysis was performed for each variables, and for the results the prototype was found. The results of FEM Analysis had been verified by compressive performance evaluation, and the similarity between two results was found. In order to examine concerns about field application, experiments in bending, bolt drawing, shaking test and setting up in real site were carried out. This paper will describe about the FEM Analysis and compressive performance evaluation of joint for built-up column(K-type), tube column(T-Type), and pile column(P-Type).