Calculation methods for along-wind loading. Part 2. Response of line-like structures to atmospheric turbulence.
Abstract:ESDU 87035 provides a step-by-step calculation procedure for the loading, accelerations and deflections of line-like 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 Comparisons are made with results obtained using the superseded method of ESDU 76001, which is found to have been slightly optimistic.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.
- Bending Moment
- Damping Ratio
- Normal Mode Analysis
- Response of Buildings and Structures
- Response of Buildings and Structures To Atmospheric Turbulence
- Turbulence Near Ground
|Data Item ESDU 87035|
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This Data Item contains 17 interactive graph(s) as listed below.
|Figure 1||Mean wind speed factor, K2V|
|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, two-span, bridge-type 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 two-span, bridge-type structures|
|Figure 3f||Normalised resonant loading factor for torsional mode, horizontal structures|
|Figure 4||Normalised spectral function for along-wind turbulence component|
|Figure 5||Turbulence admittance factor for background component|
|Figure 6||Turbulence admittance factor for resonant components|