Closure to “Design of Multi-Level Guyed Towers: Wind Loading”

1958 ◽  
Vol 84 (7) ◽  
Author(s):  
Edward Cohen ◽  
Henri Perrin
Keyword(s):  
Wind Loading ◽  
Multi Level ◽  
Guyed Towers

Design of Multi-Level Guyed Towers: Wind Loading

1957 ◽  
Vol 83 (5) ◽  
Author(s):  
Edward Cohen ◽  
Henri Perrin
Keyword(s):  
Wind Loading ◽  
Multi Level ◽  
Guyed Towers

Design of Multi-Level Guyed Towers: Structural Analysis

1957 ◽  
Vol 83 (5) ◽  
Author(s):  
Edward Cohen ◽  
Henri Perrin
Keyword(s):  
Structural Analysis ◽  
Multi Level ◽  
Guyed Towers

Nonlinear spectral dynamic analysis of guyed towers. Part II: Manitoba towers case study

2004 ◽  
Vol 31 (6) ◽  
pp. 1061-1076 ◽  
Author(s):  
A M Horr ◽  
A Yibulayin ◽  
P Disney
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Complex Geometry ◽  
Spectral Element ◽  
Wind Loading ◽  
Space Structures ◽  
Loading Test ◽  
Large Space ◽  
Post Buckling ◽  
Guyed Towers

Dynamic response of large complex space structures under wind loading is important in terms of performance and safety. Conventional method of wind loading calculation has been used successfully in codes to analyze large space structures. The method can be applied by approximating the air pressure, induced by wind, on the surfaces of structures. Although this replaces a wind loading test using complicated wind tunnel tests for any structural systems, the accuracy of the method, in the case of complex geometry guyed tower structures, is a matter of consideration. Hence, it is desirable to search for a procedure with more accuracy and reliability. In this respect, attention is paid to the advanced spectral element method and the computational fluid dynamics. Using the proposed formulation, a material and geometric nonlinear dynamic analyses have been performed to simulate post-buckling behaviours and also collapse modes for series of Manitoba Hydro's guyed towers under extreme wind loading conditions. Key words: computational fluid dynamics, wind loading, collapse mode, nonlinear analysis, post-buckling.

Discussion of “Design of Multi-Level Guyed Towers: Structural Analysis”

1958 ◽  
Vol 84 (2) ◽  
Author(s):  
Kuang-Han Chu ◽  
Myle J. Holley ◽  
Vitelmo Bertero
Keyword(s):  
Structural Analysis ◽  
Multi Level ◽  
Guyed Towers

Stability Analysis of Multi-Level Guyed Towers

1962 ◽  
Vol 88 (2) ◽  
pp. 61-80
Author(s):  
Frederick H. Hull
Keyword(s):  
Stability Analysis ◽  
Multi Level ◽  
Guyed Towers

Dynamic response of transmission lines guyed towers under wind loading

2010 ◽  
Vol 37 (3) ◽  
pp. 450-465 ◽  
Author(s):  
F. Gani ◽  
F. Légeron
Keyword(s):  
Dynamic Response ◽  
Direct Current ◽  
Transmission Lines ◽  
Wind Loading ◽  
Dynamic Effects ◽  
Transient Dynamic ◽  
Simplified Method ◽  
Loading Case ◽  
Dc Line ◽  
Guyed Towers

The importance of the dynamic response of guyed towers for transmission lines (TLs) under wind loading is evaluated in this article. The objective is to verify if the simplified static-equivalent approach provided in the current TL codes is sufficient for this type of flexible tower. As a comparison, transient dynamic (TD) analyses were performed. Two different guyed tower configurations were investigated: (i) the direct current (DC) line and (ii) the alternating current (AC) line. Loading cases considering bare and iced TL structures were studied. It was found that, depending on the guyed tower configuration and the loading case, the static-equivalent approach may underestimate the possible dynamic response. In addition, a simplified method that allows a better prediction of the dynamic effects is proposed.

A comparison of the gust factor method and the patch load method of analysis of guyed towers

1996 ◽  
Vol 23 (4) ◽  
pp. 862-871 ◽  
Author(s):  
Robert G. Selby ◽  
Robert B. Dryburgh
Keyword(s):  
Dynamic Method ◽  
Wind Loading ◽  
Dynamic Effects ◽  
Gust Factor ◽  
Parametric Studies ◽  
Patch Load ◽  
Load Analysis ◽  
Guyed Towers ◽  
Tower Height ◽  
Supporting Structures

The Canadian standard CAN/CSA-S37-94 "Antennas, towers and antenna supporting structures" (S37) has introduced as an appendix a quasi-dynamic method of analysis. This patch load method yields a more realistic pattern of forces in a guyed tower, but S37 contains no firm guidelines as to when this new method is required over the conventional static gust factor approach. This paper describes various comparative studies that were made to determine the conditions under which the normally used gust factor approach does not give sufficiently acceptable results so that patch load analyses are required. Results of the parametric studies and the analyses of a large number of actual towers showed that leg loads in the upper few spans tended to be about 15% larger on average in a patch load analysis. Face shears at the guy supports were also about 15% higher on average in the patch load method. The studies revealed no strong trends between the patch load and gust factor correlation and the tower parameters, although there were slight trends suggesting that a patch load analysis was warranted if the tower height was greater than 250 m, the aspect ratio was greater than 120, or the drag area exceeded 2.0 m2/m. The presence of a cantilever accentuated the margin between the results of the two methods. Key words: guyed towers, analysis, wind loading, dynamic effects, patch load, gust factor.

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