CompMechLab Research Projects

CompMechLab in 2007 by New Information Technologies in Aviation Company request executed mobile building computational structural analysis under various external actions.

Main advantages of such buildings are their fabricability(the opportunity to assemble and disassemble anywhere), mobility (they do not demand special transportation methods) and low cost of the manufacturing. While manufacturing of the mobile buildings ordinary steel containers are used (where apertures for windows, doors and equipment are cut out) as a basis.

Basic elements of considered mobile building are:

• the ground floor with aperture for the entrance door;
• the top floor with apertures for the multiple glass units and for the entrance door;
• stairway with the landing on the second floor.

Besides the additional equipment is fastened to various parts of a building:

• conditioner’s external block;
• filter air channel with the fan;
• the conditioner  internal block;
• heaters;
• electric service panels;
• external equipment placed on platforms on the roof. 

3D CAD models of mobile building first and second floors

In the current work the mobile building finite element structural analysis under various types of action was executed:

• normal mode of operation with the minimum loads (the environment temperature 0^оC, -60^оC, +50^оC).
• normal mode of operation with the maximum loads (the environment temperature 0^оC, -60^оC, +50^оC).
• the second floor laying-up at 84.8 toneson each fitting;
• the second floor laying-up at 12 toneson each fitting;
• the second floor laying-up at 6 toneson each fitting;
• second floor vertical hoisting using upper fittings;
• second floor hoisting using the cables connected above the structure at an angle of sixty degrees.
• hoisting using bottom corner fittings.

Second floor finite element shell model

Total displacement distribution (the environment temperatures are -60, +50 ^оC)

Von Mises equivalent stresses distribution for the minimum loads case (the environment temperature is 0^оC)

The executed computational analysis shows that the maximum second floor roof deflection is reached (in the normal operation mode) under snow loading at the environment temperature -60^оС. Under given loading the second floor roof (the snow loading zone) and the ground floor base (at temperature -60^оС - +50^оС) are the increased stress areas of the structure. The reason is the metal compression (-60^оС) or expansion (+50^оС) in the constrained conditions (caused by angular fittings rigid fasteningsto the concrete base). Thus von Mises equivalent stresses do not exceed material's yield stress.

When laying-up the mobile building's second floor both 84.4 tones and 12 tones on each fitting cases are critical. For 6 tones on each fitting the yield stress is exceeded locally in the window casement with the window-sill joint zone. The maximum total displacement is observed in the window zone. When the second floor hoisting is held the maximum von Mises equivalent stresses do not exceed 150 MPa and the window casement skewing - 1.3 mm in all cases.

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• Civil Engineering

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