Authors

Abstract

This study investigates the nonlinear stability of flat-elliptical greenhouse skeletons under wind loads, taking into account initial imperfections.. A finite element model was developed in ABAQUS, and nonlinear buckling analysis was performed using the arc-length method. Eigenvalue buckling analysis was used to identify imperfection modes, and the effect of imperfection amplitude on bearing capacity was evaluated. Results showed that an increase in imperfection amplitude led to a reduction in ultimate bearing capacity, with a 461.2 N·m² capacity at L/300, and 520.26 N·m² at L/800. Initial imperfections were found to significantly influence the yielding stage. This study demonstrates that considering initial imperfections provides a more accurate assessment of the skeleton’s stability under extreme loads.

Abstract in Chinese

本研究研究探讨了在风荷载作用下，考虑初始缺陷的平面椭圆形温室骨架的非线性稳定性。通过ABAQUS建立了有限元模型，并采用弧长法进行非线性屈曲分析。特征值屈曲分析用于识别缺陷模式，并评估缺陷幅度对承载力的影响。研究结果表明，随着缺陷幅度的增加，最终承载力下降，在L/300情况下承载力为461.2 N·m²，而在L/800情况下为520.26 N·m²。初始缺陷显著影响了屈服阶段。研究表明，考虑初始缺陷能够更准确地评估骨架在极端荷载下的稳定性。