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.
Highlights
In search of new technical solutions for light steel structures of buildings and structures in general [1], as well as their hinged-rod and cross systems in particular (Fig. 1) [2] it is very attractive and useful to take as a basis long-term practice of steel rod structures coatings [3], replacing zigzag grids from rods with shaped grids from profile pipes
The flow rate of the structural material of the compared variants is given in Table 2, from which it can be seen that the minimum value is in the modifications of a truss with a lattice of an oval pipe and a lattice of a flat-oval pipe
Such a regulation is not limited to the given value of 1/2,63 ( n 0,38024 ), but having a very wide range, in general, can ensure the efficiency of further optimization of load-bearing structures of buildings and structures
Summary
In search of new technical solutions for light steel structures of buildings and structures in general [1], as well as their hinged-rod and cross (truss) systems in particular (Fig. 1) [2] it is very attractive and useful to take as a basis long-term practice of steel rod structures coatings [3], replacing zigzag grids from rods with shaped grids from profile pipes. In the case of run-free coatings, a new structural and layout solution has been developed for trusses with similar lattices of flat-oval pipes, in which the cross-sectional dimensions differ by a ratio of 1 / 2,63 [4], where the larger dimension is located in the plane of the lattice, and the smaller one - from the plane (Fig.). Schemes of trusses with lattices of flat-oval pipes: a - side view of the fragment; b - cross section; c - side view of the fragment with unified nodes; d - cross-section with unified nodes
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