摘要
为了深入认识正放四角锥网架屋盖的固有振动特性,对拟夹层板法和有限元方法求得的第一阶竖向频率进行了比较,验证了拟夹层板法求解的精度.采用拟夹层板法对跨度30～60 m的正放四角锥网架在4种屋面荷载作用下的固有振动进行分析,并通过ANSYS软件模态分析观察网架振型,基于分析与观察结果给出了正放类网架屋盖的固有振动规律.
In order to further understand the natural vibration property of pyramid space g rid roof structures, first-order frequencies obtained by analogy sandwich method (ASM) and finite element method (FEM) were compared. The results showed that AS M was of high accuracy. Then ASM was used to analyze pyramid space grid roo f structures whose span is 30～60m under 4 kinds of roof load, and mode sh apes were also be presented by ANSYS software. Finally, some rules of free vibra tion for pyramid space grid roof structures were given.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2005年第4期59-61,共3页
Journal of Northeast Forestry University
关键词
网架
固有振动
拟夹层板法
有限元
Space frame
Natural vibration
Analogy sandwich method
Finite element method
