Scaled model impact tests are essential for assessing steel pipe concrete's impact resistance in its original proportions. The material's dynamic strength and the prototype structure's dynamic strength in the scaled model experiments of the steel pipe concrete columns do not satisfy the similarity ratio relationship due to the influence of the strain rate effect under impact. This causes a degree of error when the results of the scaled experimental model are extrapolated to the impact performance of the prototype structure. Based on the DLV (density, geometry, impact velocity) dimension system, 1/2, 1/4, and 1/8 scaled-down models for the lateral impact of large steel-tube concrete columns were created. The Workbench/LS-DYNA software created a finite element model to simulate the lateral impact of a circular steel pipe concrete column. After confirming the model's accuracy, the dynamic yield stress similarity was analyzed using steel and concrete strain rate-sensitive equations. Subsequently, the similarity ratio coefficients were recalculated. The results indicate that by taking into account the similarity in dynamic yield stress of the materials, the errors in contact force, maximum deformation, yield stress, impact velocity, and time course curve agreement of the scaled-down model of steel-pipe concrete columns, which reflect the impact performance of the original-size structure, are further minimized. Notably, the maximum deformation errors are significantly reduced, with all errors falling within 1.5 percent. In conclusion, the similarity of the materials' dynamic yield stress reduces the scaled-down model for steel-tube concrete columns' error in presenting the original-size structure's impact performance.
Key words
concrete-filled steel tube /
Strain rate effect /
Similarity ratio /
impact
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