不同配筋形式四边简支中厚板抗冲切性能分析

Analysis of punching resistance of simply supported reinforced concrete moderately thick plates with different types of reinforcement

为研究不同配筋形式钢筋混凝土简支中厚板的抗冲切性能,采用ABAQUS有限元软件,建立了钢筋混凝土简支中厚板抗冲切性能的非线性有限元模型,在非线性有限元模型验证的基础上,分别对配置抗冲切箍筋、空间钢构架、抗冲切锚栓以及型钢剪力架的钢筋混凝土中厚板的冲切性能进行了比较分析,并分析了空间钢构架缀条截面面积和间距、设置斜缀条等参数对钢筋混凝土中厚板抗冲切性能的影响。分析结果表明:抗冲切箍筋、空间钢构架、抗冲切锚栓以及型钢剪力架等配筋形式均能够有效提高钢筋混凝土中厚板的抗冲切承载力,配置空间钢构架对钢筋混凝土中厚板抗冲切承载力提高程度最为显著。空间钢构架对钢筋混凝土中厚板抗冲切承载力的影响因素可以用空间钢构架混凝土的综合影响系数λs来综合表示。随着综合影响系数λs增大,试件的抗冲切极限承载力近似呈线性的增大。这些结论可以为空间钢构架在钢筋混凝土中厚板中的应用提供技术依据。

In order to study the punching resistanceof simply supported reinforced concrete moderately thick plate with different types of reinforcement,the nonlinear finite element model for the plate was established by using ABAQUS,the finite element software. The punching resistance of the plate with different types of reinforcement,including stirrup,spatial steel frame,shear-resistant anchor,shear heads and so on,was analyzed,and the influence of the cross area of lacing bar,its spacing and oblique lacing bar was studied,as well. The results show that the punching resistance ofthe plate can be improved by the stirrups,the spatial steel frame,the punching shear anchor and the shear heads,and the punching resistance can be significantly improved by setting spatial steel frame in the plate. The influence factors to the punching resistance can be synthetically presented by using the comprehensive influence coefficient of the spatial steel frame. When the comprehensive influence coefficient increases,the punching resistance of the plate linearly increases. These conclusions can provide technical basis for the application of spatial steel frame in reinforced concrete moderately thick plates.