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Plastic joint moment values:
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he probable maximum moment at the plastic hinge is given below, according to AISC 358-16.
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The moment at the face of the column, Mf., is calculated according to AISC 358-16 Eq. 6.8-1 given below.
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The Vu used in the dimensioning of the joint is determined according to the equation in the above image by summing the shear force determined based on the
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yield state and the shear force calculated from the combination of 1.2G + 0.5Q + 0.2S on the plastic joint at the end of the beam.
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PREQUALIFICATION LIMITS
1. Beam Limitations(1)
Beam depth is limited to a maximum of
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36 in. (920 mm) for rolled shapes.
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The depth of built-up sections
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does not exceed the depth permitted for rolled wide-flange shapes.
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Beam flange thickness is limited to a maximum of 1 in. (25 mm).
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The clear span-to-depth ratio of the beam is limited as follows:
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For special moment frame systems, 9 or greater.
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For intermediate moment frame systems, 7 or greater.
2. Column Limitations
(1) The beam is connected to the flange of the column.
(2) Rolled shape column depth is limited to W36 (W920) maximum when a concrete structural slab is provided. In the absence of a concrete structural slab, the rolled shape column depth is limited to W14 (W360) maximum.
Flanged cruciform columns don’t have a width or depth greater than the depth allowed for rolled shapes. Built-up box columns don’t have a width or depth exceeding 24 in. (600 mm). Boxed wide-flange columns don’t have a width or depth exceeding 24 in. (600 mm) if participating in orthogonal moment frames.
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