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Research on equivalent static wind loadings of large-span roof structures(PDF)

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

Issue:
2005年04期
Page:
27-
Research Field:
Publishing date:
2006-12-20

Info

Title:
Research on equivalent static wind loadings of large-span roof structures
Author(s):
WU Yue1; 2;  CHEN Bo1;  SHEN Shi-zhao1
1. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China; 2. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
Keywords:
roof structure;  equivalent static wind loading;  proper orthogonal decomposition method;  RITZ vector repeat method;  load-response correlation formula method
PACS:
TU312.1
DOI:
-
Abstract:
Concerning equivalent static wind loading(ESWL)theory, people have done a lot of works on high-rise buildings and large-span bridge structures. But compared to these two type structures, the biggest difference lying in the studies of ESWL theory on large-span roof structures is the frequencies of vibration modes which are normally very close, ie, they occur within a narrow frequency range. Consequently, it is impossible to estimate the wind-induced response of a long-span structure's roof in terms of lower frequency vibration modes alone, as is normally adequate for the analysis of high-rise buildings. The problems that bring from this are: for different component of structure and different response, its equivalent principle does not be sole; structural vibration modes and load distribution patterns have some internal links; how to consider the combination of multi-vibration-mode. Authors discussed some solutions to these three problems firstly, then, put forward a preliminarily theoretical framework for deciding the ESWL on large-span roof structures, finally, gave some detail formulas for calculating background components and resonant components of ESWL. It is proved that the method of this paper provides a good characterization of the ESWL distribution with the actual extreme wind loading on large-span structures.

References:

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Memo

Memo:
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Last Update: 2006-12-20