Seismic performance of UHPC-CFST composite piers reinforced by high-strength steel bars
The finite element software ABAQUS was used to carry out the seismic numerical modeling analysis of UHPC-CFST composite piers reinforced by high-strength steel bars,and the accuracy of the modeling method was verified by comparing it with the existing test results.On this basis,the influence of axial compression ratio,UHPC strength,UHPC thickness,and yield strength of the steel tube on the mechanical properties of UHPC-CFST composite piers reinforced by high-strength steel bars was analyzed,and the suggested value ranges of each parameter were given.The results show that the increase of axial compression ratio and longitudinal reinforcement ratio can improve the horizontal bearing capacity and energy dissipation capacity of composite piers but limit the deformation of the specimens.With the increase of UHPC strength and UHPC thickness,the horizontal bearing capacity and displacement ductility coefficient of the composite piers increase first and then decrease.Increasing the yield strength of the steel tube can steadily enhance the horizontal bearing capacity of composite piers.The increase in steel tube thickness can significantly improve the seismic performance of composite piers while the volumetric stirrup ratio and concrete strength have little effect on the seismic performance of composite piers.Based on the analyzed data samples,a calculation method of horizontal peak load and displacement ductility coefficient was obtained by multivariate nonlinear regression analysis,and the calculated values of the formulas were in good agreement with the finite element analysis values.
万方数据
维普
