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基于多尺度建模技术,在有限元分析软件中实现了局部细化模型和整体宏观模型的连接,将整体结构中受力复杂的关键节点用高阶单元建立,其余部分结构采用经典梁单元模型;利用ANSYS有限元软件中的多点约束方程连接梁单元与壳单元,对比研究了传统梁单元模型与多尺度有限元模型在自重与风荷载作用下的计算结果,表明梁单元可近似模拟整体结构的力学性能,但不能精确模拟整体结构中受力复杂区域的受力状态,对整体结构的关键构件应基于多尺度建模技术采用高阶单元建立模型;此外,还分别对梁单元模型及多尺度模型进行了模态分析,得到了高阶单元的引入对整体结构刚度的影响特征。研究表明:多尺度建模方法能够有效地应用于复杂结构的整体分析中,可在计算精度和计算代价中寻求较好的平衡点。
Based on the multi-scale modeling technology, the connection between the local refinement model and the overall macro model is realized in the finite element analysis software. The key nodes in the overall structure with complicated forces are established with higher-order elements. The rest of the structures adopt the classical beam element model The beam element and shell element were connected by multi-point constraint equations in ANSYS finite element software, and the calculation results of traditional beam element model and multi-scale finite element model under self-weight and wind load were compared. It is shown that the beam element can approximate the whole body However, it is impossible to accurately simulate the stress state of the complex structure in the whole structure. The key components of the whole structure should be built based on multi-scale modeling techniques using higher-order elements. In addition, The multi-scale model was modeled and the influence of high-order elements on the overall structural stiffness was obtained. The research shows that the multi-scale modeling method can be effectively applied to the overall analysis of complex structures, and a better balance point can be found in the calculation accuracy and the computational cost.