Optimization of flat-oval pipes and perspectives of their application in core structures

Abstract

The calculation of optimal parameters of flat-oval pipes is given by an approximate method, the correctness of which is confirmed by testing using standardized profiles. A new layout of gratings made of flat-oval shaped pipes is presented, developed for truss systems based on steel rod structures of coatings with replacement of bar-shaped bent elements with tubular ones. The caseless junctions of belts and lattices with direct joining of rod elements to each other without alignment are developed, as well as with structural eccentricities limited to 0.25 of the height of the waist elements, which allows not to take them into account in calculations and provides an increase in the degree of unification of the nodes of the upper and lower belts of carrier’s constructions. The prospects of using a new technical solution in light metal structures of buildings and structures are shown. The area of its rational application is outlined, where by means of variant design of typical, known and new solutions, a quantitative estimate of the reduction in the consumption of structural material is given. The whole diagram of changes in the design parameters of flat-oval pipes is shown in the transformation of their cross-sections from vertical configurations to horizontal ones, including the transition through the outline of a circular shape.