高强钢管混凝土柱-H型钢梁框架抗震性能参数化研究

Parametric research on seismic behavior of high strength concrete-filled steel tube column - H-shaped steel beam frame

方钢管混凝土柱-H型钢梁框架结构因承载能力高,耗能能力强而被广泛应用。在框架中采用高强钢和高强混凝土可以进一步提高力学性能,减少梁柱设计截面。本文利用ABAQUS有限元软件对现有论文中普通强度钢管混凝土柱-钢梁框架进行了精细化建模分析。首先通过与试验数据进行对比,从而保证有限元模型的准确性;在此基础上通过改变钢管混凝土柱钢材强度、混凝土强度,钢梁钢材强度等进行参数化分析。分析结果表明:提高梁、柱的钢材强度对于结构的弹性刚度几乎无影响,但是钢材强度的提升明显地提高了框架的承载力和延性,柱钢材从Q355提高到Q690,框架的抗侧承载力提高了51.8%;混凝土强度的提升提高了框架的弹性刚度和承载力,但延性有所下降。

The square concrete-filled steel tube column(CFST)-H-shaped steel beam frame structure is widely used because of its better carrying capacity and strong energy dissipation capacity. The high-strength materials can further improve the mechanical properties of the frame and reduce the design cross-section of beams and columns. Based on the CFST column-steel beam frame in the existing research, the refined modeling and analysis are carried out by using ABAQUS., The accuracy of the finite element model is guaranteed by comparison with test data. Subsequently, parametric analysis is conducted by changing the steel strength, concrete strength of the CFST column, and the steel beam. The results show that the increase of the steel strength has little effect on the elastic stiffness of the structure. However, the increase of the steel strength improves the carrying capacity and ductility of the frame. The column steel is increased from Q355 to Q690, and the horizontal bearing capacity is increased by 51.8%. The increase of the concrete strength improves the elastic stiffness and carrying capacity, but the ductility decreases.