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In order to improve the adaptability and durability of pile foundation under the marine environment, an innovative type of UHPC-RC composite pile foundation is proposed, which is composed of an upper prefabricated UHPC pipe pile, the shear key connection and a lower cast-in-place RC pile. Since the shear key is the guarantee to the force transmission between upper and lower piles, push-out tests of single shear key and multiple shear keys were conducted, followed by the axial compressive tests of the composite pile joint. Combined with finite element analyses, the reasonable height ratio between UHPC keys and RC keys and the shear capacity of the shear key connection were investigated. Then, the calculation method of the axial compressive capacity of the composite pile was proposed, as well as the design procedures. Based on the design of a cross-sea bridge, it was concluded that the composite pile demonstrated lighter weight and reduced cost by about 50%, indicating that the proposed pile foundation is a promising structure to marine construction.

Experimental Study of UHPC-RC Composite Pile Connected by Shear Keys