Development of RC Piles with Hinge Isolated Structure System Having Pile Cap-Pile Head Joint
By Hisahiro Hiraishi, Tomoki Nanya, Taichi Hiraoka and Akihiro Fujiwara

Concrete Research and Technology
Vol.22, No.1, Jan 2011 (Issue 55)

This paper reports the RC piles with the damage reducing system which have the cylindrical joint between the pile cap and pile head(the RC Pile with Hinge Isolated Sturcture System as follows). The main steel bars absorbing the seismic energy are un-bonded in orfer to mitigate damage of concrete at hinge region of the joint and pile head, and supplementary main steel bars which are not anchored into pile cap are arranged to resist bending moment and shear. The cross section area of the joint half size of pile to reduce bending moment of pile head. The static loading tests are carried out to examine structure performance of the RC in high axial stress. The results showed that the piles porposed in this paper had exellent structural performance.
Hinge Isolated Structure System, axial compression steel bars, pile cap-pile head joint, high axial stress, RC pile, rotation capacity

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