Experimental Study on Semi-Rigid Pile Head Joints of Cast-In-Place Concrete Piles

Abstract eng:
To avoid the excessive input of earthquake loads through large piles it is useful to control the moment of piles by the head joints connecting to the bases. An experimental investigation was performed to examine the shear-flexural behaviors of moment controlled semi-rigid pile head joins of cast-in-place concrete piles. The proposed pile head joints that control the moment consist of the reduced concrete sectional area, short steel ring and reinforcing bars. The reduced concrete sectional area reduces the pile moment and the steel ring confines the concrete and controls the local destruction of the pile head joints. The cyclic lateral loads were applied to the specimens under a control of relative displacement angles (R) between the end stubs up to R=1/20. There was no damage in the head joints until R=1/100 and the shear-flexural behaviors were stable up to R=1/20. The experimental results showed that the proposed semi-rigid pile head joins were able to reduce the moment which occurs to the pile head and satisfy the seismic performance. A simple way to estimate the confined concrete strength and rotational performance of the semi-rigid pile heads are presented.

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