摘要
分析了张拉薄膜结构动力特性的基本特点,研究了膜面预应力、矢跨比、跨度、边索预应力、膜面索以及支承体系对结构动力特性的影响.结果表明,薄膜结构频率密集,连续成丛分布并且有多个频率重迭;刚性边界跨度较小的薄膜结构的频率较高;跨度较大且比较平坦的大面积薄膜曲面的频率较低,并且分布非常密集;考虑支承体系的张拉索膜结构的频率比未考虑的偏低,振型发生改变;膜面索对自振频率影响不显著,但会使结构的振型发生较大的变化.
Dynamic characteristics of tensioned cable-membrane structures are analyzed and the influence of prestress on membrane,prestress on cable,ridge cable,sag-to-span ratio,span of structure and the supporting system is discussed.The results show that its frequencies distribute closely and continuously and a number of frequencies overlap each other.The frequencies of membrane structure with short span and stiff edges are not low.Those of large flat membrane area are low and much closely spaced.Those of tensioned...
出处
《空间结构》
CSCD
北大核心
2008年第2期42-47,共6页
Spatial Structures
基金
国家自然科学基金重大项目(59895410)
教育部高等学校优秀青年教师教学科研奖励计划资助项目
关键词
张拉薄膜结构
动力特性
预应力
支承体系
tensioned cable-membrane structures
dynamic characteristic
prestress
supporting system
