In the design of the joint between the steel pipe pile and a reinforced concrete footing in railway structures, the strength at the pile top is underestimated.  As a result, so many reinforced bars are necessary at the pile top, which are too difficult to array in the small space.  Therefore, we have carried out a series of cyclic loading tests to investigate the mechanical behavior, proposed a reasonable designing method to improve the joint construction, and confined the effectiveness of the model based on this method.

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