Internal Force Analysis of Steel Plate Cofferdam for Main Pier of Yellow River Bridge in Yinchuan Airport of Yinxi Railway

In this paper, the internal forces within the steel plate cofferdam of the main pier for the Yellow River Bridge in Yinchuan airport of Yinxi railway are analyzed using MIDAS software and theoretical calculations. Considering the stress of steel sheet pile under two working conditions (mud suction and water pumping), the ring beam, internal support and bottom sealing concrete are calculated. The calculation results show that the maximum normal stress of the ring beam is 164.1 MPa, the maximum shear stress is 60.2 MPa and the maximum deflection is 12 mm; the internal support is less than 170 MPa; the maximum tensile stress of the bottom sealing concrete is 0.38 MPa; these results meet the design requirements. It can provide basis and reference for the application and structural optimization design of similar projects.