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# Strength calculation of a three-storey residential building. Novgorod region  (ECOPAN technology)

Construction company "New Town" offers turnkey projects and carries out construction of prefabricated houses, cottages and villa communities, condominiums, recreation, ohotbaz, dormitories, barracks, camps, construction and military camps for "ECOPAN" technology, which is based on the use of structural insulated panels.

Commissioned by the UK "New Town" was calculated the three-story apartment building, designed by "ECOPAN" technology.

Design scheme, the calculation and selection of reinforcing implemented via APM Structure3D module constituting the APM Civil Engineering Prof. system v.9.7. The main part of the building, such as walls and floors, are a frame made of sandwich panels with lining bars made of pine. Staircases are made of masonry with two floors, basement and underground engineering - reinforced concrete.

General view of the building frame

General view of the 1st and 2nd floors of the building

General view of the third floor of a building

Calculated values ​​of the loads were given in accordance with specifications.

As a result, these "loaded" were created:

• Constant (dead weight, covering of the roof, floor covering, the load of the weight of the flight of stairs)
• Useful:

• Distributed regulatory burden on floor slabs
• Distributed regulatory burden on a flight of stairs

• The snow (snow region for IV)
• Wind (wind region I to) the X axis
• Wind (for I wind region) on the Y-axis

One embodiment of combination of loads

design calculation of a three-storey residential house:

The following calculations were made for the analysis of design performance:

1. continuous footing
2. carcass strength of sandwich panels;
3. frame stiffness of sandwich panels;
4. Technical underground walls;
5. stone elements;
6. the general framework of stability of the sandwich panels.

Below are the first five calculations.

Calculation of the strip foundation:

Foundations are a beam of rectangular cross section, mounted on an elastic foundation. The stiffness of the elastic base along the vertical axis Z depends on the bed coefficients. Meaning bed coefficients for each node identified by the results of static analysis. The load on the foundation: 2 combination of load cases "with the wind on the X».

Maximum precipitate foundation is 3.5 mm, which is smaller than the base limit deformation.

Calculation of the frame strength of sandwich panels:

The most dangerous is the combination of loads 2 "with the wind on the X», since this combination wind directed along the surface of most of the building, which corresponds to the lower rigidity of the building.

From the analysis results of stress state frame of sandwich panels that the highest equivalent Mises stresses arise in the rod elements and roof slabs. Conditions carcass strength is performed with a safety factor of 1.5.

Calculation of stiffness frame sandwich panels:

The maximum total displacement of the effect of the combination of loadings 2 "with the wind by X» does not exceed the limit value.

The calculation of underground walls:

As a result of calculation of the coefficients were obtained using valves which do not exceed 1. This indicates that the applied reinforcement provides strength for the first and second groups of limiting states.

Calculation of the stone elements:

As a result of the calculation of the structural elements of stone utilization rates were obtained, which did not exceed 1. This suggests that the condition is satisfied the strength of the brick walls. Consequently, for the reinforcement stone structural elements is not required.

The configuration of the foundation c cards maximal pressure under the sole (kPa)

Distribution map Mises equivalent stress

total displacement distribution map

The calculation 253 of the component structure and presentation of results in a reinforcement layout and use of the coefficients

 Based on the results of the analysis design three-storey building was concluded, which showed that the bearing capacity of the building shell of sandwich panels provided.

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