To discuss the non-linear model of an RC pile in the ground, we tested it with a loading test system that had coil springs used for an imitation ground. The test proved that the load did not decrease in the P- relation of the pile and a curvature was gradually formed without localizing. The test result can be reproduced by the analysis to use an M- model without a negative gradient. It is considered that a negative gradient did not occur because the reinforcing bar didn't buckle due to the existence of the imitation ground.

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