This study is designed to examine the effect of the initial load on the reciprocal load by conducting various static axial reciprocal load tests of the screwed steel pipe pile with a pile head load applied to it and obtain basic data for use in the verification of the validity of the short-term allowable bearing capacity formula which was determined in the monotonous load test. The results obtained from this study are as follows. (1)The smaller is the value of the initial load, the larger is the value of the second limit resistance in the pulling direction of the ground. (2)The second limit resistance in the pulling direction measured in the reciprocal load test is lower than the value measured in the monotonous load test for each test specimen.
