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

By H. A. Buchholdt

The second one variation of this ebook presents structural engineers with a concise creation to the architectural, structural and technological facets of cable roofs, and offers adequate details for engineers to hold out their very own designs. the enhanced tools for producing wind and earthquake histories were incorporated because the pattern in sleek layout codes appear more and more to require that dynamic reaction of different kinds of non-linear buildings corresponding to guyed masts is taken into account on the layout degree

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Earthquakes are commonly classified by their intensity and peak acceleration, although this is only an approximate measure of their capacity for doing damage. Other important factors are the frequency content, duration, peak velocity and peak displacement. Of these the frequency content relative to the natural frequencies of the structures is generally the most significant. Thus earthquakes with the main energy concentration in frequency bands corresponding to dominant structural frequencies can cause more 37 Introduction to cable roof structures 0-50 r 160 I I I 25 50 75 miles Distance from causative fault Fig.

Soil-structure interaction The weights of most cable and cable stayed structures are not likely to be sufficient to alter the characteristics of the supporting ground. The flexibility of the soil will, however, tend to reduce the overall stiffness of a structure and thus reduce its frequencies and modify its modal response, as well as generating additional damping through energy dissipation. At resonance the surrounding layers of soil, such as wet clays, will also tend to vibrate in phase with the structure in the same manner as water and air will, and therefore add to the amount of vibrating mass.

31). 4, vol. 33). The method is somewhat lengthy and is not included as it is considered to be outside the scope of this book. 3) and given by n[l+50/(z,«)] 5/j where zn In the higher frequency range in which structures are likely to respond, this function approximates very closely to spectra of recorded wind histories. It is, however, suspect in the lower frequency range. 2. 35 Height 0 1 Hz 0-5 Hz 1-OHz 2 0 Hz 3 0 Hz 4 0 Hz 100 m 200 m 300 m 100m 200 m 300 m 1080275 84-5362 54-1373 38-9267 31-6070 1-5322 1-2833 1-1371 7-8016 5-9598 41139 2-8276 2-2567 0-5499 0-4389 0-3889 2-4616 1-8790 1-3136 0-8975 0-7147 0-3464 0-2765 0-2450 0-7757 0-5920 0-4166 0-2838 0-2257 0-2182 0-1742 0-1543 0-3947 0-3012 0-2124 01446 01149 01663 01329 0-1178 0-2244 01865 0-1317 00896 0-0712 0-1375 01097 00972 Another spectral density function, which also varies with height, is based on the current Engineering Science Data Unit (ESDU) model, which is given by i/(ioni+vr ; 25001/25i/3t/()2 ' <• • > where 5 t o p is a topographic factor and 4> is the hill slope.

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