Современная архитектура и строительство. Рябцева Е.В - 22 стр.

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Lesson 3
The Optimization of the Load-Bearing Structure
Pre-reading Discussion
1. How can you interpret the phrase “load-bearing structure”?
2. Are there any load-bearing structures in Tambov?
3. Why do architects need to design load-bearing constructions?
4. Is it up to builders to decide where such structure should be used?
5. Load-bearing elements are mostly used in roof constructions, aren’t they?
The load-bearing structure was initially conceived as a non-directional beam system laid out to a 24.50-
metre square grid, which could be extended in any direction and would provide adequate column-free space for
the production. The roof structure comprised a system of primary and secondary beams, with polygonal secon-
dary beams trussed on the underside and laid on the top of primary trussed girders. Each of the roof modules
was to be borne by four hinged columns.
In the course of the planning, however, the media lines for services and production technology developed
into dense clusters, so that the loading was concentrated along certain routes and was no longer evenly distrib-
uted over the area of the structure. A weight of up to 350 kg/m accrued. The load-bearing behaviour of non-
directional structural systems is no longer necessarily biaxial when subject to linear loading. In other words, the
structure would have been overdimensioned in one direction and no longer strictly economical. The non-
directional bearing principle was abandoned, therefore, although the 24.50-metre square column grid was re-
tained.
To optimize the load-bearing structure, the layouts for the mechanical services and the production technol-
ogy were superimposed on the structural plans. The loads on individual areas were calculated, and the spacings
of the secondary beams adjusted accordingly. Elements subject solely to tension stresses were fabricated from
steel plates; for those subject to tension and compression, narrow channel sections were used; while compres-
sion members liable to buckling were formed from rolled steel sections symmetrical about two axes. This re-
sulted in material savings and also made the function of the various elements legible. The depth and spacing of
the girders were determined in conjunction with the service runs. By creating a V-shaped load path with tie
members over the round steel column, an obstacle-free triangle is formed with adequate space for the distribu-
tion of services.
The roof plane was designed as a plate structure with prestressed steel rod bracing. It serves to stabilize the
upper chords of the lattice girders and to transmit wind loads to the concrete cores and vertical bracing. In the
longitudinal direction, the bracing elements are located in the façade plane in the middle of the 171.50-metre-
long hall. These elements allow the load-bearing structure to expand outwards in both directions from the cen-
tre, thereby effectively halving the extension length. As a result, it was possible to construct the hall without
expansion joints and additional diagonal bracing in the production areas. A continuous girder system, with a
maximum span of 98 m, acts as bracing in the longitudinal direction. The administration tract is separated from
the production hall by a construction joint and is independently braced by stiffening elements and by fixing the
roof plate to the concrete cores. The steel table structure with a stacked-plank floor in the offices is braced by
the farming effect on both sides and flexibly connected to the columns that support the roof structure.
Vocabulary List
– a beam – балансир
– a grid – решетка, сетка
– to comprise – включать, заключать в себе, охватывать
– to truss – связывать, укреплять
– a girder – балка, брус, перекладина
– a cluster – группа, блок
– a route – линия, курс, направление, маршрут
– to accrue – нарастать, накапливаться, увеличиваться
– tension – напряжение, натянутость
– to fabricate – изготавливать, производить
– to buckle – сгибать, гнуть

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