Finite Element Analysis of Axial Compression Performance of UHPC Hollow Column
To investigate the axial compression bearing capacity of ultra-high performance con-crete(UHPC)hollow columns,90 UHPC hollow column models with varying wall thickness,concrete strength,longitudinal reinforcement configuration,and stirrup spacing were designed.The numerical simulation analysis was conducted using finite element simulation software(ABAQUS).The influence of various factors on the bearing capacity of UHPC hollow columns was studied by employing the control variable method.The results indicate that reducing the width-to-thickness ratio and increasing concrete strength can significantly enhance the bearing ca-pacity of UHPC hollow columns.By increasing the longitudinal reinforcement ratio and stirrup ratio,the compressive bearing capacity of the hollow columns in UHPC can be slightly enhanced.Specifically,the influence of the longitudinal reinforcement ratio on the bearing capacity is slight-ly greater than that of the stirrup ratio.Additionally,the initial stiffness and bearing capacity of 9 UHPC hollow columns slightly decreased after replacing the corner longitudinal steel bars with basalt fiber reinforced polymer(BFRP)bars.Based on the finite element analysis results on the bearing capacity,a simplified calculation formula was proposed for the bearing capacity of UHPC hollow columns.The difference between the simulated values of 81 models and the calculated val-ues via the formula was mostly within a 2%error line.Meanwhile,the six values from experi-ments were within the 10%error line.This indicates that the proposed formula has a high preci-sion and can provide a reference for the design of UHPC hollow columns.
UHPC hollow columnfinite element analysisaxial compressive performanceulti-mate bearing capacitysimplified calculation model
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