钢储罐顶盖子午线型单层球面网壳模态分析
|
摘要
对目前被广泛采用的石油化工钢储罐固定顶盖子午线型单层球面网壳进行了动力特性分析。在考虑钢储罐罐壁和顶盖支座刚接与铰接两种不同连接形式下,采用了子空间迭代法对子午线型球面网壳进行了无阻尼自由振动下的前400阶频率、周期和振型的结构特征对分析计算。结果表明,由于储罐罐壁刚度相对较大,带罐壁相互作用下的顶盖网壳整体模态与无罐壁独立网壳的模态基本一致,在频谱特性上无显著差异,网壳与罐壁连接采用刚接或铰接不同支座约束条件时对各阶模态影响不明显。同时还表明,子午线型单层球面网壳具有与三向网格形网壳相似的频谱密集、水平与竖向振型交替而呈无规律的基本动力特性;但不存在明显的频率跳跃现象,高阶振型在结构分析中起控制作用。
In this paper,the dynamic behaviors of single-layer meridional dome used widely in fixed roof of steel storage tank in petro-chemical industry were analyzed.Considering rigid and hinge two connection types between roof and tank wall,the frequency,period and mode of 400 orders under the free-vibration without damping were calculated using sub-space iteration method.The result have indicated that the whole modal of roof dome with tank wall is consistent with the modal of roof dome without tank wall due to larger rigidness of tank wall,and there is no distinct difference in behavior of frequency spectrum.It have been also found that the connection type of roof dome to tank wall,i.e support type,in rigid or hinge have no distinct influence to modal of each orders of roof dome.And it simultaneously indicated that comparing with three-dimensional,single-layer meridional dome has the similar properties of dense frequency spectrum,irregular basic dynamics and mode alternation both in horizontal and vertical direction.But there is no obvious phenomena of frequency leap.The mode of high order will govern the result in structural analysis.
In this paper,the dynamic behaviors of single-layer meridional dome used widely in fixed roof of steel storage tank in petro-chemical industry were analyzed.Considering rigid and hinge two connection types between roof and tank wall,the frequency,period and mode of 400 orders under the free-vibration without damping were calculated using sub-space iteration method.The result have indicated that the whole modal of roof dome with tank wall is consistent with the modal of roof dome without tank wall due to larger rigidness of tank wall,and there is no distinct difference in behavior of frequency spectrum.It have been also found that the connection type of roof dome to tank wall,i.e support type,in rigid or hinge have no distinct influence to modal of each orders of roof dome.And it simultaneously indicated that comparing with three-dimensional,single-layer meridional dome has the similar properties of dense frequency spectrum,irregular basic dynamics and mode alternation both in horizontal and vertical direction.But there is no obvious phenomena of frequency leap.The mode of high order will govern the result in structural analysis.
引文
[1]赖盛,何国富.大型储罐顶盖网壳结构的计算分析比较[C].第十二届空间结构学术会议论文集:499-504.
[2]何国富.子午线型单层网壳在大型储罐顶盖应用中的规范执行问题[J].石油化工设备,2010,39(2):52-55.
[3]范峰,沈世钊.网壳结构的反应谱抗震性能分析[C].第九届空间结构学术会议论文集,2000:201-207.
[4]曹资,张毅刚.单层球面网壳地震反应特征分析[C].第八届空间结构学术会议论文集,1997:195-201.
[5]JGJ 7—2010,空间网格结构技术规程[S].
[6]蓝天,张毅刚.大跨度屋盖结构抗震设计[M].北京:中国建筑工业出版社,2000:122-141.
[7]曹资,张毅刚.各类常用网壳结构的地震反应规律[C].国家自然科学基金重大项目专题年度研究报告:1999.
[8]张家华,高承勇,安东亚.密集振型分布特征空间结构反应谱法修正研究[J].建筑结构,2008(6):16-18.
[2]何国富.子午线型单层网壳在大型储罐顶盖应用中的规范执行问题[J].石油化工设备,2010,39(2):52-55.
[3]范峰,沈世钊.网壳结构的反应谱抗震性能分析[C].第九届空间结构学术会议论文集,2000:201-207.
[4]曹资,张毅刚.单层球面网壳地震反应特征分析[C].第八届空间结构学术会议论文集,1997:195-201.
[5]JGJ 7—2010,空间网格结构技术规程[S].
[6]蓝天,张毅刚.大跨度屋盖结构抗震设计[M].北京:中国建筑工业出版社,2000:122-141.
[7]曹资,张毅刚.各类常用网壳结构的地震反应规律[C].国家自然科学基金重大项目专题年度研究报告:1999.
[8]张家华,高承勇,安东亚.密集振型分布特征空间结构反应谱法修正研究[J].建筑结构,2008(6):16-18.
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