12.4column-beam relationship limitations

AISC 358-22, Prequalified Connections for Special and Intermediate Steel Moment Frames for Seismic Applications

Last Updated 29 Oct 2026

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Beam connection-to-column connections shall satisfy the following limitations:

(1) Panel zones shall conform to the requirements of the AISCSpecification.
(2) Column-beam connection moment ratios shall be limited as follows:
(a) For SMF systems, the column-beam connection moment ratio shall conform to the requirements of the AISC Seismic Provisions. The value of $\sum M_{p b}^{*}$ shall be taken equal to $\sum\left(M_{p r}+M_{u v}\right)$ , where $M_{p r}$ is calculated according to Equation 12.9-28, and $M_{u v}$ is the additional moment due to shear amplification from the center of the vertical line of bolts in the shear plate to the centerline of the column. $M_{u v}$ is calculated as $V_{u}\left(a+d_{c} / 2\right)$ , where $V_{u}$ is the shear at the shear-plate connection calculated in Section 12.9, Step 12, $a$ is the distance from the centerline of the shear-plate shear bolts to the face of the column as shown in Figure 12.3(c), and $d_{c}$ is the depth of the column.
(b) For IMF systems, the column-beam moment ratio shall conform to the requirements of the AISC Seismic Provisions.

AISC 358-22, Prequalified Connections for Special and Intermediate Steel Moment Frames for Seismic Applications

Last Updated 29 Oct 2026

Hover any section to copy its link or text, ask Copilot about it, or bookmark it.

Beam connection-to-column connections shall satisfy the following limitations:

(1) Panel zones shall conform to the requirements of the AISCSpecification.
(2) Column-beam connection moment ratios shall be limited as follows:
(a) For SMF systems, the column-beam connection moment ratio shall conform to the requirements of the AISC Seismic Provisions. The value of $\sum M_{p b}^{*}$ shall be taken equal to $\sum\left(M_{p r}+M_{u v}\right)$ , where $M_{p r}$ is calculated according to Equation 12.9-28, and $M_{u v}$ is the additional moment due to shear amplification from the center of the vertical line of bolts in the shear plate to the centerline of the column. $M_{u v}$ is calculated as $V_{u}\left(a+d_{c} / 2\right)$ , where $V_{u}$ is the shear at the shear-plate connection calculated in Section 12.9, Step 12, $a$ is the distance from the centerline of the shear-plate shear bolts to the face of the column as shown in Figure 12.3(c), and $d_{c}$ is the depth of the column.
(b) For IMF systems, the column-beam moment ratio shall conform to the requirements of the AISC Seismic Provisions.