UHPC全包裹S690高强型钢短柱轴压性能研究

Analysis of Axial Compression of Ultra High Performance-concrete Encased S690 High Strength Steel Short Column

以高强型钢超高性能混凝土短柱(型钢强度为S690,UHPC强度为C130)的轴压试验为基础,利用有限元软件对试件进行了非线性有限元分析,有限元分析结果和试验荷载-位移曲线吻合较好,破坏模态相同,峰值荷载偏差值为8.9%,有限元模拟型钢荷载-竖直应变曲线和荷载-水平应变的峰值应变偏差为4.3%,验证了建模方法的可靠性,表明该有限元模型可以准确预测其轴压性能。基于试验和数值模拟分析了试件的受力机理。最后利用该有限元模型探究了箍筋间距参数、混凝土保护层内布置钢丝网参数对轴压性能的影响。结果表明:箍筋间距增加,试件轴压峰值承载能力变化不大,剩余承载能力减小;设置钢丝网以后,试件的峰值承载能力和剩余承载能力提高。

Nonlinear finite element analysis was performed on specimens based on the axial compression test of ultrahigh performance concrete encased high strength steel short column(steel strength is S690,UHPC strength is C130).The results of the finite element analysis are in good agreement with the experimental load displacement curve,the failure mode was identical and the peak load deviation is 8.9%.The peak strain deviation of the load-vertical strain curve and load-horizontal strain is 4.3%,which verifies the reliability of the modeling method indicating that the finite element model can accurately predict its axial compression performance of the steel.The mechanical mechanism of the specimen was analyzed based on experimental and numerical simulation.Finally,the finite element model was utilized to investigate the effects of stirrup spacing parameters and steel wire mesh parameters on the axial compression properties.The results show that as the stirrup spacing increased,the peak axial load capacity of the specimen does not change,while the residual load capacity decreases.After the wire mesh is set,both the peak load capacity and residual load capacity of the specimen increase.