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为研究杆件初始缺陷和杆件失稳对网壳结构稳定性的影响,采用ANSYS有限元分析软件,引入杆件的初始缺陷,考虑杆件自身的屈曲破坏,确定其最不利整体缺陷模态和杆件缺陷模态。采用传统梁单元模型和精细化壳单元模型分别对采用圆钢管、矩形钢管、工字钢三种不同截面形式杆件的网壳结构进行稳定性分析,结果表明,考虑杆件缺陷的网壳结构稳定承载力大幅度降低。进行杆件轴力跟踪分析和杆件失稳传导分析发现,单层网壳的整体稳定破坏源于单根杆件的率先屈曲,杆件失稳瞬间迅速向相邻杆件传导,导致结构整体破坏。进行了K6(2)工字钢截面网壳的加载破坏试验,验证了预设缺陷的单根杆件失稳并传递诱发了整体破坏,且承载力受工字钢弱轴缺陷的影响很大。
In order to study the influence of the initial defect of rod and the instability of rod on the stability of reticulated shell, ANSYS finite element analysis software was used to introduce the initial defect of rod and the most unfavorable overall defect mode And rod defect mode. By using the traditional beam element model and the refined shell element model, the stability of the reticulated shell structure with three different cross-sections of round steel pipe, rectangular steel pipe and I-beam is analyzed respectively. The results show that the reticulated shell structure Stable carrying capacity greatly reduced. The axial force analysis of the rod and the instability of the rod were analyzed. It was found that the overall stability of the single-layer reticulated shell originated from the buckling of the single rod, the instability of the rod quickly transmitted to the adjacent rod, damage. The load failure test of K6 (2) I-section reticulated shell was carried out. It was verified that the failure of a single rod with prefabricated defects and the transmission induced the overall failure, and the bearing capacity was greatly affected by the defect of the I-axis weak axis .