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单跨门式刚架在偶然荷载作用下局部构件(梁或柱)失效引起整体结构的连续性倒塌具有突发性、不可预测性等特点,并且所造成的破坏性强、危害性大、影响深远,在设计中应引起足够重视。以“备用荷载路径法”为指导,利用数值分析方法研究了结构倒塌,并以一典型物流类单跨门式刚架为例,采用通用有限元分析软件ANSYS对结构进行弹塑性静力分析,深入地认识结构的倒塌过程及荷载-位移变化特征。最后基于“二次传力路径法”的设计思想,通过增加冗余构件和增设备用传力路径,提出了门式刚架纵向加强抗倒塌解决方案,并通过方案比选,得到简单易行、合理有效、经济适用的最优方案。
The failure of partial members (beams or columns) under the action of accidental load caused by the failure of single-span portal rigid frame caused by the continual collapse of the whole structure is characterized by suddenness and unpredictability. The destructiveness, the harmfulness and the impact Far-reaching, in the design should cause enough attention. Under the guidance of “Alternate Load Path Method ”, numerical simulation is used to study the structural collapse. Taking a typical single-span portal rigid frame as an example, the finite element analysis software ANSYS is used to elastically and statically Analysis, in-depth understanding of the collapse process of the structure and load-displacement changes. Finally, based on the design idea of “Secondary Force Path Method”, by adding redundant components and increasing the transmission force path of equipment, a solution of longitudinal reinforcement and anti-collapse of portal frame is put forward and simpler Easy, reasonable and effective, economical and optimal solution.