THE MODIFIED FORCE- DENSITY METHOD FOR FORM- FINDING OF PRETENSIONED CABLE ROOFS
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摘要: 结合工程需要对普通力密度法进行了改进,给出了在给定控制条件下悬索结构的力密度找形迭代公式和迭代策略,形式简单明了。通过对若干典型工程算例的找形计算表明,改进的算法具有收敛精度高,计算能力强,适用范围广等优点,是一种很好的悬索结构成形算法。Abstract: In order to meet the needs of the practical structural des ign, the iterative formula and tactics for the form finding of cable roofs are proposed. It is called as the modified force- density method. T he method is verified by s ome benchmark problems and big proj ects. Numerical examples s how that the modified method is very simple and efficient. It can be used to find the shape of various pretensioned cable roofs.
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Key words:
- modified force-density method /
- pretens ioned cable roofs /
- form-finding
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Schek H J.The Force Density Method for Form Finding and Computation of General Networks.Computer Methods in Applied Mechanics and Engineering,1974(3):115-134 [2] Linkwitz K.About form Finding of Double-Curved Structures.Engineering Structures,1999,21(5):709-718 [3] 沈世钊,徐崇宝,赵臣.悬索结构设计.北京:中国建筑工业出版社,1997 [4] 张其林.索和膜结构.上海:同济大学出版社,2002 [5] 叶继红,李爱群,刘先明.动力松弛法在索网结构形状确定中的应用.土木工程学报,2002,35(6):14-19
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