Abstract: In order to study the influences of hammering pile driving on the overall anti-bending performance of PHC piles with single-side welded joints after construction, field pile driving tests and full-scale anti-bending tests are conducted. The test results show that the pile driving process will cause certain damage to the welded joints of PHC piles, making the existing defects slightly larger, and the defects are mainly located below the surface of the welded joints in adistace of 7~9 mm. However, the quality of the welded joints after pile driving still meets the requirements of the China's code. The anti-bending performance of PHC piles with single-side welded joints after pile driving is still better than that of the pile body. During the loading process of the anti-bending tests, cracks in the lower pile appear eariler than those in the upper pile, and the deflection growth rate of the lower pile is faster than that of the upper pile. Until the upper pile has cracks, the deflection growth rate of the two piles gradually decreases. The hammering process has limited impact on the anti-bending performance of the welded joints and the welded pile as a whole, with a reduction of no more than 13%. Under the premise of ensuring construction quality, the single-side welded joint can ensure the overall anti-bending performance of the pile body after pile driving.