What is the optimum values of sag for cables in cable stayed ( a value of 1/10 of the length of cable is right or what?) and what is the range of the inclination angle of the cables?
Dear Ahmed,
The attached Ph.D. thesis compares the optimal design of three types of cable stayed bridges using genetic algorithm:
Zadeh, O. S. (2012). Comparison Between Three Types of Cable Stayed Bridges Using Structural Optimization (Doctoral dissertation, The University of Western Ontario London).
In the thesis, an advanced and comprehensive numerical model is used to obtain the post-tensioning forces and the optimum design of the three types of cable-stayed bridge. The numerical method is based on finite element, B-spline curves, and real coded genetic algorithm. The optimization accounts for all the variables that define the geometry and cross-section of the bridge. Comparison between the three types, in terms of post-tensioning forces and cost, is carried out
http://ir.lib.uwo.ca/cgi/viewcontent.cgi?article=2246&context=etd
For suspension bridges the sag ratio of the main suspension cables is normally between 1/11 to 1/9. The higher the denominator the stiffer the bridge.
For stay cable bridges (cable stayed), angle of inclination of stays do not generally goes below 22 degrees to the horizontal. For smaller angle the stay become too inefficient ant you have very high compression forces in the deck.
Smaller angles are used in extradosed bridges, bridges that are intermediate between stayed girders and post-tensioned ones, but these i would not classify as cable supported.
Good question.. Please share me the best answer might you trust...
Regards…
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