An Introduction to Cable Roof Structures by H. A. Buchholdt

By H. A. Buchholdt

The second one version of this e-book offers structural engineers with a concise advent to the architectural, structural and technological facets of cable roofs, and provides adequate info for engineers to hold out their very own designs. the enhanced equipment for producing wind and earthquake histories were integrated because the development in glossy layout codes look more and more to require that dynamic reaction of different sorts of non-linear buildings akin to guyed masts is taken into account on the layout degree

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The nature and statistical properties of wind i\ Macrometeorological range 10-2 Micrometeorological range 10" 1 5 1 5 10 50 Cycles/h Fig. 1. Spectrum of longitudinal wind fluctuations (the full line of the spectrum is after van der Hoven2'1) speed signals recorded over periods ranging from only lOmin to 2h. In this way fluctuations due to the high-frequency components are eliminated so that only those due to the long-term fluctuations can be observed. Thus, as already mentioned, the wind velocity can be divided into two parts: an average steady state velocity, which varies with the long-term fluctuations due to macrometeorological causes, and a fluctuating velocity with highfrequency components due to turbulence.

In wind engineering the quadrature spectrum is 25 Introduction to cable roof structures usually assumed to be negligible compared to the co-spectrum. 42) where Cx2{xj - xkf + Cy2(yj - ykf + Cz2{Zj - zkf\ and the exponential decay coefficients Cz = 10 and Cy = 16. Full-scale measurements, however, indicate that Cy and Cz decrease with increasing height, and increase with increasing wind speed and increasing ground roughness. Different wind codes may therefore recommend other values for Cy and Cz than those given above.

7. HP, high point; LP, low point: (a) pressure distribution below the roof surface, no edge beams and no walls, H/A = 0-5, wind at 90°; (b) pressure distribution above the roof surface, with edge beams and walls, H/A = 0-5, wind at 0°; (c) pressure distribution above the roof surface, with edge beams and walls, H/A = 0-5, wind at 45°; (d) pressure distribution above the roof surface, with edge beams and walls, H/A = 0-5, wind at 90° 31 Introduction to cable roof structures LP Fig. 8. Pressure distribution above the roof surface; HP, high point; LP, low point; with edge beams and walls, and roof curvature corresponding to H/A = 0-5 of roof shown in Fig.

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