The objective of this study is to examine the concrete filled effect in the hollow part of SC pile in order to improve the deformation performance of pile. In the pile foundation structure, the ultimate limit state design is increasingly required. But, Study on the deformation capacity of precast concrete pile is not sufficiently advanced. Therefore, the test data accumulation is not enough to discuss the deformation performance of pile.
This study focuses on the SC pile in precast concrete pile. In the previous study, the effect of each parameter on the deformation performance of the SC pile was investigated by the simple beam bending test. It confirmed that deformation performance was reinforced by infilling the hollow part of the pile with concrete or soil cement.
This study examined the effect of some parameters for deformation performance of SC pile by cantilever beam bending shear test. Two parameters are set for the test. The parameters are 1) Axial force, 2) Infilled material. We observed the failure conditions, relations between the displacement of vertical and the drift angle, relations between the load and the displacement, and relations between the bending moment and the curvature.
The knowledge obtained from this study are shown below.
1) Regarding axial displacement, infilled soil cement can suppress the progress of rapid axial displacement. And infilled concrete can suppress then progress of axial displacement more than can infilled soil cement. It is more effective to use infilled material with high compressive strength and high elastic modulus.
2) Regarding the axial force holding performance, at the stage where the drift angle has advanced, it can sufficiently bear the introduced axial force by using soil cement or concrete as a filling material.
3) Regarding the effect of improving bending deformation performance, in the case of infilled soil cement, the improvement effect is about 27% (Axial force ratio 0.15) and about 22% (Axial force ratio 0.23). In the case of infilled concrete, the improvement effect is about 86% (Axial force ratio 0.16) and about 89% (Axial force ratio 0.24).
4) Regarding the maximum values of bending moment and curvature, the test value of the all test specimen are similar or greater than the analysis value in this study. It seems that the performance evaluate using analytical values can be considered safe in seismic structure design.
5) In the range of the yield bending moment ratio=1, the relation between yield bending moment ratio and curvature by simple beam method test and cantilever method test can be compared by dimensionless.
