摘要
在保证具有足够工程设计精度的前提条件下 ,针对小矢跨比曲杆内力的计算 ,通过合理的假定推导出一种所谓的等效刚度中心法以简化计算 .通过该法可以利用一般的有限元分析程序直接对含有小矢跨比曲杆的结构进行较为准确的近似分析 ,并且有效地控制了计算模型的总自由度数 .对几种常用方法进行的算例对比表明 ,该简化计算方法具有相当的计算精度 ,并能够满足设计及计算的精度要求 .
In this paper,a kind of approximate method named equivalent-stiffness-center method was developed to imitate the stiffness performance of arc element with limited ratio of its height to its chord.With this method,each kind of FEM software can be used directly to approximately analyze the structures including arc members with wonderful precision.Meanwhile,the calculating degrees of freedom of the structures were also limited to the acceptable extend.After comparing the results of examples calculated by other different methods,it shows that this simplified method can provide satisfactory precision.
关键词
曲杆
等效刚度中心
等效单元
有限元
arc member
equivalent-stiffness-center
equivalent member
