New design methodology for central and eccentric-compressed elements of various structural shapes from various materials is presented, examples of course projects, methods and examples of designing reinforced concrete and metal spans of road bridges are given, issues of structure design automation are considered, it contains the theory of weight surface for bent building structures developed by the author with recommendations arising from it on selection of optimal height of bent structures and level of design resistance of material in three different zones of the area of their possible design solutions.