三层空间框架结构的振动研究

Study on the Vibration of Three-layer Space Frame Structure

对一个简化的三层空间框架钢结构进行强迫振动试验,得到结构的低阶自振特性;同时对该三层空间框架结构进行有限元分析,通过模态分析模拟得到该结构的低阶自振特性;数值模态分析的低阶结果与实验结果相比较,有良好的一致性,说明计算模型可靠;利用有限元法模拟该空间框架结构的高阶自振特性,为框架结构的建筑或厂房的自振频率的计算提供实验依据和有限元分析依据。

This paper makes the forced vibration test on a simplified three-layer steel space frame structure and obtained the lower order self-vibration characteristics of the structure, and makes the finite element analysis on this three- layer space frame structure, and obtained the lower order self-vibration characteristics of the structure through the modal analysis and simulation, and the low order result of the numerical modal analysis agrees well with the test result, which illustrates that the calculating model is reliable, and by using the finite element analysis, simulates the high order self- vibration characteristics of the structure, which provides the foundations for the test and finite element analysis for the calculation of the natural frequency of vibration of the buildings and industrial units with the frame structure.