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Calculation flue pipe NPP

The design description
chimney located on a reinforced concrete slab covering obstroyki nuclear reactor compartment. A constructive solution of the vent pipe is placed inside another one pipe using the space therebetween as ventilation shaft. The outer pipe diameter of 3 m and a wall thickness of 16 mm is a supporting structure. The inner pipe 1.6 m in diameter and 4 mm in wall thickness to the outer suspended. Fixing of the inner tube knaruzhnoy by four fins 10 mm to be installed along the pipe in steps of 10 m. The pipes are made of steel 15HSND.


  Method of calculation
 The calculation of buildings and structures, taking into account the seismic load is made according to the requirements established by the relevant regulations - 14.13330 joint venture for the Russian Federation and Ukraine DBN V.1.1-12-201. In accordance with these set loads, load combinations and calculating for calculating characteristics of seismic stability boundary (HCLPF). 
 Civil and industrial use APM CivilEngineering computer-aided design of building objects lets you build a model, reliably describing the geometry and behavior of real structures with subsequent calculation of the finite element method. In constructing braces and beams entryways rod members are used, and for the construction of tubes and spacers - trehuzlovye plate members. 
 Estimate Module APM Structure 3D, belongs to the software system that allows to count the stress-strain state of a structure for static and dynamic loading, to perform the calculation of stability, the natural frequencies and forced oscillations, and other calculations. Seismic feedback calculation is linearly spectroscopic method spectra using horizontal and vertical accelerations. 
 APM Structure 3D module has a qualification certificate №330 of April 18, 2013, issued by Rostekhnadzor, as well as a certificate of compliance regulations such as the joint venture 20.13330, 14.13330 JV, SP.15.13330, SP16.13330, CP-52-101, CP-50 101, SP-50-102.
 

 Calculation chimney
 supports the tube set in a rigid vent tube pinching units in place of its bearing on the reinforced concrete cover rigging, as well as a fastening hinge assemblies in place bearing struts to the containment. 
 Figure 1 shows a finite element model of the chimney nuclear reactor compartment.

 
Figure 1 - The finite element model of a vent tube: a) general view; b) the headroom; c) the location area of ​​spacers; g) base
 
Figure 2 - The above results of calculation of stress: a) an outer chimney; b) in the inner chimney
 
Figure 2 - The above results of calculation of stress: a) an outer chimney; b) in the inner chimney
 
Figure 3 - Form your own pipe oscillations: a) 1st form; b) The 14th form
 
Figure 3 - Form your own pipe oscillations: a) 1st form; b) The 14th form

Conclusion
  From the results of the calculation of conclusions about the strength of steel chimney NPP reactor compartment were made under seismic actions according to the requirements of building regulations in seismic regions. 
  The results show that the CAD system of building civil and industrial facilities APM CivilEngineering destination can be used for chimneys calculations on the seismic effects.

 
 
 
 
 
 
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