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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

24卷

期数:

2007年02期

页码:

13-18

栏目:

出版日期:

2007-06-20

文章信息/Info

Title:

Analysis of the Most Unfavorable Simple Dynamic Loads for Single-layer Spherical Latticed Shells

作者:

苑宏宇^1,2,叶继红¹,沈世钊³,单建¹

1. 东南大学 土木工程学院,江苏 南京 210096; 2. 北京首都工程建筑设计有限公司南京分公司, 江苏 南京 210018; 3. 哈尔滨工业大学 土木工程学院,黑龙江 哈尔滨 150090

Author(s):

YUAN Hong-yu^1,2, YE Ji-hong¹, SHEN Shi-zhao³, SHAN Jian¹

1. School of Civil Engineering, Southeast University, Nanjing 210096, Jiangsu, China; 2. Nanjing Branch of Beijing Capital Engineering Architectural Design Ltd, Nanjing 210018, Jiangsu, China; 3. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China

关键词:

单层球面网壳;  简谐荷载;  阶跃荷载;  最不利动荷载;  极限荷载;  动力响应

Keywords:

single-layer spherical latticed shell;  harmonic load;  step load;  the most unfavorable dynamic load;  limit load;  dynamic response

分类号:

TU311

DOI:

-

文献标志码:

A

摘要:

同时考虑了几何非线性与材料非线性,分别对简谐荷载、阶跃荷载作用下的单层球面网壳进行了最不利动荷载分析:通过变换简谐荷载的频率和阶跃荷载的持时,明确了结构动力响应与其自振特性及荷载频谱特性之间的关系,确定了何种条件下的荷载为结构最不利动荷载。结果表明:无论是水平还是竖向简谐荷载,当激励荷载频率与激励作用方向最大振型参与系数所对应的固有频率接近时,为结构的最不利动荷载; 无论是水平还是竖向阶跃荷载,当荷载持时为荷载作用方向最大振型参与系数所对应的固有周期的1/2时,为结构的最不利动荷载。

Abstract:

Through simultaneously considering geometric non-linear and material non-linear, the dynamic responses of single-layer spherical latticed shells subjected to harmonic loads and step loads were researched respectively, and the most unfavorabledynamic loads of the structure were analyzed. Under the analysis of dynamic behavior of single-layer spherical latticed shells subjected to harmonic loads with different frequency and step loads with different duration, the relationships between the structural dynamic response and its self vibration characteristic, as well as the load frequency characteristic were built up, by which the most unfavorable loads of single-layer sphericallatticed shells were determined. The results show that under either horizontal harmonic loads or vertical harmonic loads, when the excitation load frequency is closed to the natural frequency which corresponds to the largest vibration mode participation coefficient in the direction of excitation, the limit harmonic load is the lowest; when the duration of step load is closed to the half of natural period which is versus the largest modes of vibration participation coefficient in the direction of excitation, the limit step load is the lowest.

参考文献/References:

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相似文献/References:

[1]李杰,倪振华,谢壮宁.单层球面网壳风振分析的时域法与频域法比较[J].建筑科学与工程学报,2008,25(02):45.
　LI Jie,NI Zhen-hua,XIE Zhuang-ning.Comparison of Wind-induced Vibration Analysis of Single-layer Spherical Latticed Shells Between Time Domain Method and Frequency Domain Method[J].Journal of Architecture and Civil Engineering,2008,25(02):45.
[2]包伟,叶继红,沈世钊.基于响应面法的单层球壳简谐荷载下的破坏形式判别[J].建筑科学与工程学报,2007,24(01):7.
　BAO Wei,YE Ji-hong,SHEN Shi-zhao.Failure Types Identification of Single-layer Spherical Shells Under Harmonic Loads Based on Response Surface Method[J].Journal of Architecture and Civil Engineering,2007,24(02):7.

备注/Memo

备注/Memo:

收稿日期:2007-02-26
基金项目:国家自然科学基金重点项目(50338010)
作者简介:苑宏宇(1979-),女,河北故城人,东南大学工学硕士研究生,E-mail:zxfhappy2002@sohu.com。

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更新日期/Last Update: 2007-06-20