ESDU 87035
Calculation methods for alongwind loading. Part 2. Response of linelike structures to atmospheric turbulence.
Abstract:
ESDU 87035 provides a stepbystep calculation procedure for the loading, accelerations and deflections of linelike structures such as bridges, masts and towers, or structural elements such as beams or columns which can be fixed at either one or both ends. The loading is derived as the sum of a mean component together with background and resonant fluctuating components. Precalculated loading factors, based on the wind model in the Series, are included in graphical and equation form for estimation of the fluctuating components. The input data necessary are discussed and, where appropriate, approximate values are provided. A calculation sheet for the method is included and its use illustrated with a worked example. Comparisons are made with results obtained using the superseded method of ESDU 76001, which is found to have been slightly optimistic. See ESDU 92036 for a computer program of the method presented here.Indexed under:
 Bending Moment
 Damping Ratio
 Normal Mode Analysis
 Response of Buildings and Structures
 Response of Buildings and Structures To Atmospheric Turbulence
 Turbulence Near Ground
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Data Item ESDU 87035  

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This Data Item contains 17 interactive graph(s) as listed below.
Graph  Title 

Figure 1  Mean wind speed factor, K^{2}_{V} 
Figure 2a  Normalised background loading factor for all structures, displacement response only 
Figure 2b  Normalised background loading factor for vertical cantilever structures 
Figure 2c  Normalised background loading factor for horizontal cantilever structures 
Figure 2d  Normalised background loading factor for structural members 
Figure 2e  Normalised background loading factor for horizontal, twospan, bridgetype structures 
Figure 2f  Normalised background loading factor for torsional moment, horizontal structures 
Figure 3a Part 1  Normalised resonant loading factor for cantilever structures, first mode 
Figure 3a Part 2  Normalised resonant loading factor for cantilever structures, first mode 
Figure 3b  Normalised resonant loading factor for vertical cantilever structures, second mode 
Figure 3c  Normalised resonant loading factor for horizontal cantilever structures, second mode 
Figure 3d  Normalised resonant loading factor for structural members 
Figure 3e  Normalised resonant loading factor for structural members, second mode and twospan, bridgetype structures 
Figure 3f  Normalised resonant loading factor for torsional mode, horizontal structures 
Figure 4  Normalised spectral function for alongwind turbulence component 
Figure 5  Turbulence admittance factor for background component 
Figure 6  Turbulence admittance factor for resonant components 