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9.6. CONCENTRICALLY BRACED
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FRAME WITH HIGH DUCTILITY LEVEL
Concentrically braced steel frames of high ductility level are dimensioned in such a way that no significant loss of strength occurs in the structural system, even if some of the braced members under compression are buckled. The rules to be applied in the dimensioning of these systems are given below:
9.6.1. General Conditions
9.6.1.1 - The width-to-thickness ratios of beams, columns and braces should not exceed the limiting width-to-thickness ratios, λhd, from Table 9.3, for members designed with high ductility level.
9.6.1.2 - Along any line of braces, braces shall be deployed in alternate directions such that, for either direction of force parallel to the braces, at least 30% but no more than 70% of the total horizontal force along that line is resisted by braces in compression.
9.6.3. Braces
Braces with high ductility level shall comply with the following requirements:
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(b) Connection detail of stiffeners to brace shall be dimensioned under the effect of axial force computed by Ry Fy Afb / 1.5 (GKT) or Ry Fy Afb (YDKT).
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