索网结构两种找形方法的比较与分析

由于现在的计算机硬件和程序的开发平台相对于过去有了很大的改进并放松了许多的限制 ,因此对于承受均布荷载的索网结构有必要采用更精确的有限单元模型对过去的简化两节点模型进行改进。采用五节点曲线单元模型建立索网结构的有限元模式 ,自编程序 ,对索网结构考虑其自重作用下的找形分析 ,并和原来的两节点不考虑自重作用的找形分析的结果作了比较和分析 ,结果证明自重对找形有一定的影响 ,表明五节点模式精度很高

COMPARISON AND ANALYSIS BETWEEN TWO FORM-FINDING METHODS FOR CABLE NET STRUCTURES

Because the capacity of the computer hardware and program developer have been greatly improved in recent years,the two node finite element model should be replaced by a five node element model which is more precise for the cable net structures sustaining uniform load Therefore,by means of incremental nonlinear finite element U L. method based on the updated total Lagrangian formulation,the theory of the five node curved finite element has been derived and a nonlinear equation computation is achieved Form finding for cable net structures considering self weight is carried out by a Fortran program and the numerical results have shown that the present model is of high precision by a comparison with the two node element model