ESDU 90036
Structures of noncircular cross section: dynamic response due to vortex shedding.
Abstract:
ESDU 90036 provides procedures for the calculation of the acrosswind response of structures arising from vortex shedding. It deals with structures of noncircular crosssectional shape and is applicable to buildings, towers, stacks and structural elements. The methods on which the calculation procedures are based have been derived from measurements on parallelsided structures of regular cross section with sharp corners aligned symmetrically with the flow. Such shapes include those of square, rectangular, triangular and polygonal cross section and typical structural member shapes such as I and Hbeams. The effect of rounded edges and taper can be important and guidance is given on how to extend the applicability of the methods to these cases. The procedures are summarized in calculationsheet format and provide estimates of the rms and maximum amplitude at the critical wind speed for vortex shedding and also for offcritical wind speeds. Several worked examples are included and a comparison is made between predicted and measured responses from a number of wind tunnel studies.Indexed under:
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Data Item ESDU 90036  

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This Data Item contains 10 interactive graph(s) as listed below.
Graph  Title 

Figure 1a  Strouhal number for various section shapes 
Figure 1b  Strouhal number for various section shapes 
Figure 2  Values of C _{D}_{∞} for twodimensional rectangular sections 
Figure 3a  Values of fluctuating lift coefficient for stationary cylinder 
Figure 3b  Values of fluctuating lift coefficient for stationary cylinder 
Figure 4a  Integral parameter F_{Ls} accouting for spanwise correlation effect on C_{L′} 
Figure 4b  Integral parameter F_{Ls} accouting for spanwise correlation effect on C_{L′} 
Figure 5a  Part 1  Integral parameter f_{η} accouting for amplitude effect on C_{L′} 
Figure 5a  Part 2  Integral parameter f_{η} accouting for amplitude effect on C_{L′} 
Figure 5b  Integral parameter f_{η} accouting for amplitude effect on C_{L′} 
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