In order to explore the dynamic response of variable section steel pipe concrete pile foundation under earthquake when the bridge is located in a weak soil layer, taking Xiangan Bridge as the engineering background, the numerical model of pile-geotechnical-steel pipe coupling under earthquake action was established by using FLAC3D finite element software, and the dynamic response differences of variable section steel pipe concrete monopile, a variable section ordinary concrete single pile body acceleration, pile body displacement and pile bending moment under different strength of earthquake were studied. The results show that the pile body acceleration, acceleration amplification coefficient, pile displacement maximum value and pile bending moment variation law of variable section steel tube concrete monopile under earthquake action are similar to those of ordinary concrete monopile with variable section, but the acceleration amplification coefficient of the pile body is reduced, and the lateral deformation resistance and bending bearing capacity of the pile foundation are improved. Therefore, the steel pipe can significantly improve the deformation resistance and bearing capacity of the pile foundation under the action of earthquake.
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