Based on the experimental study of eccentric compression of circular steel tube UHPC short column,a finite element model of the eccentric compression circular steel tube UHPC short columns was established using the finite element analysis software ABAQUS,and numerical analysis was carried out.The applicability of the finite element model was verified by comparing the load-displacement curves and failure modes of the experiment and finite element simulation.Based on this,the effects of eccentricity,steel tube diameter-thickness ratio,steel strength and UHPC strength on the load-displacement curve of the specimen were further studied.The results show that the deflection formation in the mid span section area of the eccentric compression column is significant,and the component exhibits a typical compression bending failure mode.The bearing capacity of eccentric compression columns shows a nonlinear decreasing relationship with eccentricity ratio and diameter to thickness ratio.The improvement of UHPC strength or steel strength can effectively enhance the bearing capacity of eccentric compression columns.The eccentricity ratio has the most significant impact on the mechanical properties of steel tube UHPC eccentric compression components.Finally,based on the superposition principle and combined with experimental results,the equivalent strength coefficient α and equivalent compression zone height coefficient β of UHPC were calculated,and a calculation formula for the eccentric compression bearing capacity of circular steel tube UHPC short column was established.
关键词
超高性能混凝土/有限元分析/钢管混凝土/偏压力学性能/承载力计算
Key words
ultra high performance concrete(UHPC)/finite element analysis/steel tube concrete/eccentric compression mechanics behavior/bearing capacity calculation
维普
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