الفهرس 
Chapter 1 IntroductionOnly 14 pages are availabe for public view
 |  | from | 235 |  |  |
| | | from | 235 | | |
Abstract
The main objective of the present work is to examine the factors affecting the static behavior of suspension cable roofs with circular plan of views, in which roofs cable beams are suspended radially and attached at the perimeter of the roof to rigid R.C. edge ring/s and at the center to steel ring/s, to propose an appropriate approach for their preliminary calculations and design aspects. For this purpose, several circular suspension roofs with various geometrical and mechanical properties have been analyzed based upon the minimization of the total potential energy by the conjugate gradient method to produce non-dimensional curves, tables, and transformation expressions. The preliminary approach is applicable for any structure with similar characteristics and can be used to determine the maximum roof deflections, maximum tensions of the sagging cables, minimum tensions of the hogging cables, and the maximum normal forces of the rings. It is noted that the method shows good results compared to the more accurate nonlinear analysis methods used by commercial structural analysis programs, and can be readily utilized for preliminary design of convex, concave, and convex-concave cable roof beams. Finally, suspension roofs with various shapes of cable beams are analyzed due to turbulent wind loads based on wind velocity – time history fluctuations generated on basis of IWATANI method. Results obtained are compared to equivalent wind load distributions typically used for preliminary design of such systems.