大跨度Kiewitt型弦支穹顶结构的自振特性分析
|
摘要
弦支穹顶结构是由单层球面网壳和下部张拉体系组合而成的一种新型的空间结构体系,以120m跨度K8型弦支穹顶结构为例,采用分块兰索斯(Lanczos)法对其自振特性进行了分析,分析时考虑拉索预应力、撑杆高度、结构跨度和荷载等4个因素对结构自振频率的影响。结果表明:当拉索预应力增大到一定程度,再增加预应力对结构的自振频率影响有限;结构自振频率随着撑杆高度的增加而增大;小跨度弦支穹顶与单层网壳自振模态相当接近,但大跨度弦支穹顶与同等跨度下的单层网壳自振模态明显不同。
Suspendome is a new type space structure system,which is consisted of single-layer spherical latticed shell and lower suspended structure.The finite element analysis models of K8 suspendome with span of 120m are established by the software ANSYS.Based on the cable prestress,bar length,span and load,the natural vibration characteristics of suspendome are analyzed by the block Lanczos method.Several conclusions can be made as follows:Improving cable tensions has little impact on the natural frequencies when the tension reaches a limit,and the natural frequencies of the structure increase with the bar length increasing.The modes of suspendome and single-layer spherical latticed shell are similar when the span is small,but the modes of them are different when the span is large.
Suspendome is a new type space structure system,which is consisted of single-layer spherical latticed shell and lower suspended structure.The finite element analysis models of K8 suspendome with span of 120m are established by the software ANSYS.Based on the cable prestress,bar length,span and load,the natural vibration characteristics of suspendome are analyzed by the block Lanczos method.Several conclusions can be made as follows:Improving cable tensions has little impact on the natural frequencies when the tension reaches a limit,and the natural frequencies of the structure increase with the bar length increasing.The modes of suspendome and single-layer spherical latticed shell are similar when the span is small,but the modes of them are different when the span is large.
引文
[1]李峰,李萌.考虑支承结构的弦支穹顶动力特性及参数分析[J].水利与建筑工程学报,2010,8(3):57-60.
[2]张明山.弦支穹顶结构的理论研究[D].杭州:浙江大学,2004.
[3]李永梅,张毅刚.凯威特型索承网壳结构的自振特性及参数分析[J].世界地震工程,2007,23(1):91-97.
[4]王秀丽,王磊.单层椭球网壳的动力性能研究[J].四川建筑科学研究,2009,35(1):19-22.
[5]曹资,薛素铎.空间结构抗震理论与设计[M].北京:科学出版社,2005.
[6]李可娜,殷志祥.Kiewitt型弦支穹顶结构自振特性研究[J].空间结构,2011,17(1):21-27.
[7]张爱林,王冬梅,刘学春,等.2008奥运会羽毛球馆弦支穹顶结构模型动力特性试验及理论分析[J].建筑结构学报,2007,28(6):68-75.
[8]董军,唐柏鉴.预应力钢结构[M].北京:中国建筑工业出版社,2008.
[9]周焕廷,袁健,李国强.索网结构找形分析及其在ANSYS中的实现[J].水利与建筑工程学报,2007,5(4):19-21.
[10]陈志华,郭云,李阳.弦支穹顶结构预应力及动力性能理论与实验研究[J].建筑结构,2004,34(5):42-45.
[2]张明山.弦支穹顶结构的理论研究[D].杭州:浙江大学,2004.
[3]李永梅,张毅刚.凯威特型索承网壳结构的自振特性及参数分析[J].世界地震工程,2007,23(1):91-97.
[4]王秀丽,王磊.单层椭球网壳的动力性能研究[J].四川建筑科学研究,2009,35(1):19-22.
[5]曹资,薛素铎.空间结构抗震理论与设计[M].北京:科学出版社,2005.
[6]李可娜,殷志祥.Kiewitt型弦支穹顶结构自振特性研究[J].空间结构,2011,17(1):21-27.
[7]张爱林,王冬梅,刘学春,等.2008奥运会羽毛球馆弦支穹顶结构模型动力特性试验及理论分析[J].建筑结构学报,2007,28(6):68-75.
[8]董军,唐柏鉴.预应力钢结构[M].北京:中国建筑工业出版社,2008.
[9]周焕廷,袁健,李国强.索网结构找形分析及其在ANSYS中的实现[J].水利与建筑工程学报,2007,5(4):19-21.
[10]陈志华,郭云,李阳.弦支穹顶结构预应力及动力性能理论与实验研究[J].建筑结构,2004,34(5):42-45.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心