Simplified design of frames with decoupled diagonal bracings

The structural behaviour of decoupled diagonal bracings is similar to that of X bracings, but as there are two braced zones, each containing one diagonal instead of two, the problem of overstrength described above for X bracings takes place differently, as twice as many columns are involved in the bracing.

For this reason, clause 6.7.3(2) states that no lower bound value of slenderness restricts the possible dimensions of the diagonals in this case. However, to be complete the design must also address, as stated in clause 6.7.4(3), the part of the frame in which the diagonals are in compression, because they introduce compression in the column intersecting their lower end, for instance in column AB of Fig. 6.13.

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