Analysis of Mechanical Properties of Silt Washed Pier Considering Two-Way Fluid-Structure Coupling
To address the safety issues of bridge structures affected by local scouring from the Yellow River mudflows,this study employod bidirectional fluid-solid coupling theory and turbulence theory to establish a numerical analysis model for sand-laden mudflow impacting bridge piers,which was validated against experimental data from literature.Based on this,calculations were conducted for three different cross-sectional pillars to assess scouring effects.The results indicate that circular cross-section pillars exhibit better resistance to scouring,making them more suitable for the Yellow River bridge piers,while triangular cross-section pillars demonstrate superior diversion capabilities,rendering them more suitable for abutments.Building upon this,numerical simulations were conducted for circular cross-section bridge piers under four different sediment concentrations.Comparative analysis reveals that as sediment concentration increases,the likelihood of pier scou-ring by mudflows increases,corroborated by comparisons with impact forces.Moreover,within a certain range of sediment concentrations,the dynamic response of bridge piers increases with sediment concentration;however,beyond this range,the dynamic response sharply declines.
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