大跨度料堆棚网架半球棚网架有限元分析与模态分析

Finite Element Analysis and Modal Analysis of Hemisphere Shed Mesh Frame for Large-Span Stockpile Shed Mesh Frame

为确保大跨度料堆棚网架结构的安全性和避免其与外界激励发生共振,需对其进行有限元分析并且通过模态分析研究其振动特性。本文使用了APDL经典的命令流操作,并且通过利用csys,2球坐标的方法建立了大跨度料堆棚网架几何模型,对网架结构进行有限元分析,得到了大跨度料堆棚网架的应力的云图,对梁单元的支反力,长细比等数据进行输出,得到具体结果;并对其进行了模态分析,得到了前九阶固有频率和固有振型。通过有限元分析和模态分析对网架结构的安全性进行了评估,分析结果表明该结构满足我国规范要求,其设计合理,结构稳定可靠,可为同类网架的进一步结构优化提供参考依据。

In order to ensure the safety of the large-span stacker shed mesh frame structure and to avoid its resonance with external excitation,it is necessary to carry out finite element analysis and investigate its vibration characteristics by modal analysis.In this paper,the classical command flow operation of APDL is used,and the geometrical model of the large-span stacking shed net frame is established by using the method of csys,2 spherical coordinates,and the finite element analysis is carried out by applying the load to the net frame structure to get the cloud diagram of the stresses of the large-span stacking shed net frame,and the output of the data of the beam unit's support and reaction force and the length and slenderness ratio,etc,to get the specific results;and the modal analysis is carried out,and the first-ninth-order intrinsic frequency and vibration characteristics of the structure are obtained.The first nine orders of intrinsic frequency and intrinsic vibration pattern.The safety of the mesh frame structure is evaluated by finite element analysis and modal analysis,and the analysis results show that the structure meets the requirements of China's specifications,its design is reasonable,the structure is stable and reliable,and it can provide a reference basis for the further structural optimization of the same kind of mesh frame.