Design of metal structure of the roof of the building
Our design company has developed working documentation for stage P of the metal structure of the roof of the building.
DESIGNING STRUCTURE
The project KM1 developed a metal structure of the roof above object C.
The roof structure above object C is a system of steel rectangular profiles 180x100x8, supported on frames formed of beams with a cross section of 35Ш2 and columns with a cross section of 35Ш2. Frame construction is anchored to the RC slab with Hilti Hit 500SD bolts. To ensure horizontal rigidity of the structure, as well as for making horizontal forces, horizontal and vertical connections are provided from profiles L100x100x7, located in the first and last spans of the roof structure.
Building Responsibility: II
Climatic region, GOST 16350–80: II5
Loads and impacts of SNiP 2.01.07-85 *; SP 20.13330.2011 - Appendix 5
Maps of zoning of the territory of the USSR according to climatic characteristics.
Snow district, Map 1: III
Average wind speed v for the three coldest months, Map 2: v = 4m / s
Wind load pressure area, Map 3: I
Ice wall thickness, Map 4: II
Average monthly air temperature
in January, Map 5: tI = -10 ° C
in July, Map 6: tVII = 20 ° C
Deviations of average daily temperatures from average monthly in January, Map 7: ΔI = 20 ° C
in July: ΔVII = 6 ° C
Roof loads of the KM project
For the calculation of structures, the following regulatory loads are taken:
SNiP 2.01.07-85 *; SP 20.13330.2011
- Snow load
Standard value of snow load: so = sn = 0,7cectμsg
sg = 1.80 kN / m2
sn = 1.26 kN / m2
Average wind speed v for the three coldest months: v = 4m / s
Average monthly air temperature in January: tI = -10 ° C
Estimated value of snow load: sg = 1.77 kN / m2
- Wind loads
Calculation according to SNiP 2.01.07-85 *; SP 20.13330.2011, Clause 11.
Wind pressure area: I
Standard value of wind load: wo = wn = 0,23 kN / m2
Terrain Type: B
- Pie Roofing
Standard value of the load ……… 2,50 kN / m2
- The own weight of the structure is calculated automatically by the program
Corrosion protection of steel structures
The degree of aggressive media exposure to metal structures according to SNiP 2.03.11-85; SP 28.13330.2012:
The degree of aggressive influence of the environment on metal structures (inside unheated buildings or under sheds):
Corrosion protection should be made of lacquer coatings of group III. All metal surfaces before painting must be cleaned and degreased, covered with epoxy primer of thicknesses. 5-7 microns. Painting metal surfaces to perform polyurethane enamel thicknesses. 40-60 microns (thickness together with the ground).
DESIGN DOCUMENTATION
Steel structures should be manufactured and installed in accordance with the KMD drawings (metal structures) developed in compliance with SNiP 3.03.01-87, MDS 53-1.2001 and GOST 23118-2012. All steel structures are mounted in accordance with the SNiP 12-04-2002. In the manufacture and installation of steel structures should be provided with quality control work. The quality and grade of metals used in accordance with the project in the manufacture and installation of structures must meet the requirements of the relevant standards and specifications and be certified with certificates or passports of plants. When transporting metal structures to use fixtures and packaging, precluding the formation of deformations in structures. Factory fabrication of metal structures by welding should be: - According to the developed and controlled technological process. - All the legs of the seams should be 1.0t, where t = the smallest thickness of the joint elements. - All butt joints must undergo quality control and satisfy the condition Rwy = Ry. Material for welding - a group of structures 2 and 3, climatic region II. according to table D.1 SNiP II-23-81 *; SP 16.13330.2011 for manual welding - use E50 GOST 9467-75 * electrodes for automatic and semiautomatic welding - use Sv-08A GOST 2246-70 * welding wire, fluxes according to GOST 9087-81 * - Process the structure with anti-fire protection to ensure the limit fire resistance according to PPM.
Structural material - С 245. 2. Assembling of structures should be carried out on assembly bolts and welding. 3. Welding should be done with electrode E - 50, taking into account the requirements for welding at minus t °. 4. Take the bead of the seam equal to the minimum thickness of the elements to be welded. 5. Corrosion protection must be carried out in accordance with the requirements of SP 28.13330.2012 6. Before painting, all metal surfaces must be cleaned and degreased and coated with an epoxy primer. 7. Staining of metal surfaces to perform polyurethane enamel. 8. All dimensions to clarify on the spot. 9. Process the structure with anti-fire protection to ensure fire resistance according to the APM. All construction work should be carried out in accordance with the current chapters of the SNiP 12-03-2001 and SNiP 12-04-2002 "Safety of work in construction".
The technical decisions made in the Project comply with the requirements of environmental, sanitary and hygienic, fire-fighting and other laws, regulations, rules and standards in force in the territory of the Russian Federation, source data, as well as technical conditions and requirements issued by the state supervision (control) bodies and organizations when coordinating initial permits, and ensure safe operation of the facility for human life and health, as well as protection of the population and sustainability of in emergency situations subject to the measures provided for in the Project.