蜂窝式压弯构件弯矩作用平面内稳定承载力研究

Research on the Stable Bearing Capacity of Castellated Beam-Columns under Bending Moment Action in Plane

本文采用理论分析与数值模拟相结合的方法,对蜂窝式压弯构件在弯矩作用平面内的稳定承载力进行研究。利用ABAQUS有限元软件对偏心荷载作用下的蜂窝式压弯构件进行参数化分析,研究孔型、开孔率、孔间距等因素对其稳定承载力的影响规律。结果表明:在开孔率相同时,圆形孔的极限稳定承载力要优于正六边形孔;随着开孔率的增加,其极限稳定承载力在不断减小,建议六边形孔蜂窝构件的开孔率在30%~40%之间,圆形孔蜂窝构件的开孔率在30%~50%之间;当孔间距增加时,蜂窝式压弯构件的极限稳定承载力提高。本文引入蜂窝构件换算长细比的概念,基于边缘屈服准则,提出了考虑开孔参数的蜂窝式压弯构件极限稳定承载力计算公式并与有限元结果验证,误差在7%以内,既满足精度要求,又偏于安全,能为蜂窝式压弯构件在实际工程中的应用提供参考。

In this paper, theoretical analysis and numerical simulation are used to study the stable bearing capacity of castellated beam-columns in the plane of bending moment. Parametric analysis of castellated beam-columns under eccentric load was carried out by using ABAQUS finite element software, and the influence law of hole shape, opening rate, hole spacing and other factors on its stable bearing capacity was studied. The results show that the ultimate stable bearing capacity of circular hole is better than that of regular hexagonal hole at the same opening rate. With the increase of porosity, the ultimate stable bearing capacity decreases. It is suggested that the porosity of hexagonal castellated beam-columns should be between 30%~40% and that of circular beam-columns should be between 30%~50%. When the hole spacing increases, the ultimate stable bearing capacity of the cellular castellated beam-columns flexors increases. In this paper, the concept of conversion of the slenderness ratio of honeycomb members is introduced. Based on the edge yield criterion, a calculation formula for the ultimate stable bearing capacity of castellated beam-columns flexors considering the opening parameters is proposed and verified with the finite element results. The error is less than 7%, which not only meets the accuracy requirements but also is safe, which can provide a reference for the application of castellated beam-columns flexors in practical engineering.