水塔特种结构体系固有振动理论分析与有限元验证

THEORETICAL ANALYSIS AND FINITE ELEMENT VERIFICATION OF NATURAL VIBRATION OF SPECIAL WATER TOWER STRUCTURE SYSTEM

为掌握水塔这种特殊工程结构的动力特性,文中基于高等结构动力学,依据质量集中法将水塔结构简化为单自由度振动模型,推导出水塔结构的自由振动基频解析解。利用有限元软件ABAQUS建立水塔三维有限元模型,进行水塔结构的模态分析,获得水塔结构的模拟基频和振动模态,通过对比可以看出水塔结构自由振动基频解析解与模拟结果吻合较好,验证了水塔结构自由振动基频解析解的正确性及使用范围,可见文中提出的质量集中法可以较为准确地计算水塔结构的基频。最后结合实际工程给出水塔结构的抗震设计建议。

In order to investigate the dynamic characteristics of this special engineering structure,the analytical solution of the free vibration fundamental frequency of the water tower structure is derived.Based on the advanced structural dynamics,the water tower structure is simplified as a single degree of freedom vibration model according to the mass concentration method.Furthermore,the three-dimensional finite element model of the water tower is established by using the ABAQUS software,and the modal analysis of the water tower structure is carried out.The simulation fundamental frequency and vibration mode of the water tower structure are obtained.It can be seen that the analytical solution of the free vibration fundamental frequency of the water tower structure is in good agreement with the simulation result,which verifies the correctness and application scope of the analytical solution of the free vibration fundamental frequency of the water tower structure.In addition,the mass concentration method proposed in this paper can accurately calculate the fundamental frequency of water tower structure.Finally,the aseismic design suggestions of water tower structure are given.