Part 1: Architect’s Guide 1 - 21 Figure 4.12 External cross-bracing in a multi-storey building 4.2.3 Frame effect option In order to avoid bracing between the beams, it is possible to design rigid-jointed continuous frames. Multi-storey buildings with a load-bearing structure formed of rigid frames often require an increase in the column section and sometimes in the beam section. Since ensuring stability by frame action is less economical than by bracing, a combination of the two systems can provide an efficient and balanced solution. It is possible to have frames in one direction and to use bracing for stability in the perpendicular direction. The advantages of continuous frames are: The primary beams are stiffer – the deflections are lower than those of simply supported beams The floors are less sensitive to vibrations Adding redundancy to the structure increases robustness. The disadvantages are: The connections are more complex and the erection is more complicated The internal forces in the columns are increased The structure is globally more expensive. Structures made of continuous frames in both directions are exceptional. They can be recommended for buildings with special requirements (medical research, white rooms, equipment sensitive to deflections and vibrations, etc.).
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