基于OpenSees高强钢筋活性粉末混凝土剪力墙数值模拟

Numerical simulation of reactive powder concrete shear wall with high strength steel bars based on OpenSees

文章研究HRB600级钢筋与超高性能混凝土对提高剪力墙抗震性能的影响,提出一种配置HRB600钢筋的超高性能混凝土剪力墙结构体系;采用非线性有限元软件OpenSees及纤维单元法,通过该软件系统中Concrete04和Steel02本构模型建立钢筋混凝土剪力墙的结构模型,利用试验结果验证其适用性;对3种配置HRB600钢筋的活性粉末混凝土剪力墙模型结构进行抗震性能分析,并对不同轴压比作用下的高强钢筋超高性能混凝土剪力墙试件进行抗震分析对比。结果表明:配置HRB600钢筋可以有效提高剪力墙的承载能力,使其在地震作用下的耗能能力明显增强,墙面分布筋、暗柱纵筋采用HRB600钢筋相比于普通钢筋对剪力墙的延性系数分别提升4.52%、14.50%;随轴压比增大,剪力墙的承载力也有较大提升。研究结果可为高强钢筋在超高性能混凝土中的应用提供借鉴。

This paper discusses the influence of HRB600 steel bars and ultra-high performance concrete on improving the seismic performance of shear walls,and proposes a system of ultra-high performance concrete shear wall structure with HRB600 steel bars.The nonlinear finite element software OpenSees and the fiber element method are used to establish the structural model of the reinforced concrete shear wall through the Concrete04 and Steel02 constitutive models in the software system,and the test results are used to verify its applicability.Seismic performance of three kinds of HRB600 reinforced reactive powder concrete shear wall structure model is analyzed,and seismic analysis and comparison of ultra-high performance concrete shear wall specimen with high strength steel bars under different axial compression ratios are conducted.The results show that configuration of HRB600 steel bars can effectively improve the bearing capacity of the shear wall,and increase the energy dissipation under seismic action.The ductility coefficients of the shear wall using HRB600 steel bars as wall distribution bars and concealed column longitudinal bars increase by 4.52%and 14.50%,respectively,compared with those using the ordinary steel bars.In addition,with the increase of axial compression ratio,the bearing capacity of the shear wall also increases significantly.The research results can provide a reference for the application of high strength steel bars in ultra-high performance concrete.