T型钢-方钢管钢筋混凝土十字形柱抗震性能研究

On the Earthquake-resistant Behavior of Cross-shaped Reinforced Concrete Columns Composed of T-shaped Steel and Square Steel Pipe

为研究T型钢-方钢管混凝土异形柱的抗震性能,采用有限元分析软件ABAQUS 2020对已有文献中的试件进行建模计算及验证,在可靠的模型基础上分析改变轴压比和T型钢翼缘厚度后的参数变化。结果表明:所建模型在滞回曲线和破坏形态上具有较高的吻合度,极限承载力和延性误差在10%以内;应力分析表明,受压及受拉区T型钢翼缘首先出现屈服,当接近极限荷载时,纵筋及T型钢腹板出现屈服,最后核心区钢管出现屈服,增大T型钢翼缘是提高抗震性能的有效方式;采用型钢-钢管的配钢形式可以使十字形柱在高轴压比下抗震性能满足规范要求;随着T型钢翼缘的增大,试件的极限承载力和延性逐渐增大,延性最大增幅为14.9%。

In order to study the earthquake-resistant behavior of specially shaped columns composed T-shaped steel and square steel pipe,this paper used ABAQUS2020,a software of finite-element analysis,to establish models to verify the test samples in the existing literature by calculation.Based on reliable models,an analysis was conducted to show how parameters would vary when axial compression ratio and the thickness of T-shaped steel flange were modified.The results have shown that the hysteretic curves of the established model are in good agreement with its failure forms,with a tolerance in ultimate bearing capacity and ductility of no more than 10%;according to the stress analysis,the yielding first happens to the flanges of T-shaped steel in compression and tension sections,successively followed by the longitudinal bars and T-shaped webs when the ultimate load is maximum,and the steel pipes in the core section,which indicates that enlarging the flanges of T-shaped steel is probably the most effective way to enhance its earthquake-resistant behavior;the use of T-shaped steel and square steel pipe allows such behavior under high axial compression ratio to meet the standards;with the expansion of the flanges of T-shaped steel,the ultimate bearing capacity and ductility gradually increase with a maximum of 14.9%.