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The Investigation on Wind-induced Vibration Response of Cable Dome Structures

Author: XuMu
Tutor: WeiDeMin
School: South China University of Technology
Course: Structural Engineering
Keywords: cable dome wind-induced vibration frequency domain method number of the combined modes time history analysis wind-induced vibration coefficient
CLC: TU399
Type: Master's thesis
Year: 2011
Downloads: 87
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Abstract


Cable dome is a kind of tensile structure with good performance and beautiful diversiform appearance, which is composed of cables, membrane and struts. This structure is sensitive to wind load and its nature frequency is low for it is flexible. In actual project, there are many cases of wind-induced damage, so it is of great importance to investigate the wind-induced response of cable dome. Most current wind-resistant reaserches focus on the cable-strut (CS) system rather than the membrane-cable-strut (MCS) system which is obviously more similar to actual structures.In this paper, a FEA sphere cable dome model with the span of 100m is established. On the basis of that, the self-vibration characteristics of CS and MCS systems are studied separately. Besides, frequency domain results are obtained and the wind-induced vibration coefficients are calculated. By comparing the results of the two systems, the CS system is proved not appropriate for wind-induced response analysis. After that, the number of the combined modes in the frequency domain computation is discussed and recommended.Time history responsed analysis of MCS system which follows the from-finding and static analysis is carried out to investigate the response in time domain. When achieving the comparison between time and frequency domain results, these conclusions can be drawed: in time domain analysis, responses of windward ridge cable elements are larger than that of leeward elements on the profile which is parallel with the wind direction. Energy of fluctuating wind is mostly dissipated by membrane. The amplitude of stress variation of leeward membrane elements is larger than that of windward membrane. The wind-induced vibration coefficients of time and frequency domain are close to each other in most part of the structure.In brief, the crucial point of cable dome wind-resistant design is to guarantee that the strength failure of membrane would not happen and the wind-induced vibration is under control. Generally, the cable would not slack and the struts would not collapse or lost their stability during a gusting. Dispalcements are mostly upward due to the model shape and wind characteristics.

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