Wooden frames are used as load-bearing frames storey pavilion type buildings for various purposes. Most commonly used single-span gable frame with symmetrical bolt. Frame is usually solved by three-hinged with hinge supporting the scheme and ridge sites, and hard knot at the junction of the crossbar with a rack (curtain pen). In modern construction is used mainly factory frame structures manufacturing. Rack and crossbars of: frames made in the form of multi-layer package with a continuously variable or stepwise variable length section.
Pair crossbar with a reception at the precipitous site is carried out at the place of manufacture of frames jointing and laminated packages crossbar rack on a gear connection with an overlap seam plywood overlaid with glue or a smooth transition to the latch bar by bending plates in this site. Prefabricated frame, the individual elements are transported to the site in parts, is usually carried out with the device in the eaves strut additional nodes. For small spans and loads of such frames can be arranged in solid bars on plots facilities construction companies. Frame structures in comparison with arch have a much greater self-weight. In a preliminary determination of its own weight frames by the formula should be factor As.v – 5-i-7. Calculation of three-hinged wooden frames produced by the usual methods of statics. Example.
To project teams and to calculate the load-bearing wooden structures are not heated logistics warehouse district base supply system, "Agriculture". The distance between the building blocks of B = 3 m, L = span of 9 m. The construction site – area of the city of Kuibyshev. The roof and walls of the building of asbestos corrugated sheets of ordinary profile. Designs are made in the carpentry workshop production workshops of a construction company with subsequent assembly and installation on-site construction. Solution. Bearing cross-frame building design in the form of single-span balanced teams cobbled gable frames with bolt. Three-hinged frame to solve the circuit with hinged supporting the ridge and eaves nodes and rigid nodes. Rigidity is ensured by coupling bolts resistant bolts 2 and a wooden strut 3, together perceiving nodal bending moment. Rack frames are based on the columnar concrete foundations, towering above the floor level at 20 cm lower ends are located at undermining distance a = 2 m from the top of the bases, thus ensuring the normal use of interior space Gaba Rita. Full height racks accept hCT – 3,5 m. The slope of the roof, i = 1, 2.5 (a = 21 48 '). For girders frame should be laid with coarse-shields Asbestos roof sheathing under 6, the construction of which provides a spatial coverage and sustainability of the immutability of crossbars frames of their plane. A similar board structure used for the device and the walls. In addition, to ensure longitudinal stability of structures in the extreme (pritortsovyh) spans a plane struts and girders frame additionally to be delivered or diagonal cross-tight connection.