CONTINUITY PLATES BASIC STANDARDS AND TUTORIALS


Continuity Plate Thickness
Where continuity plates are required, the thickness of the plates shall be determined as follows:

(a) For one-sided (exterior) connections, continuity plate thickness shall be at least one-half of the thickness of the beam flange.

(b) For two-sided (interior) connections, the continuity plate thickness shall be at least equal to the thicker of the two beam flanges on either side of the column. Continuity plates shall also conform to the requirements of Section J10 of the AISC Specification.

Continuity Plate to Column Attachment
Continuity plates, if provided, shall be welded to column flanges using CJP groove welds. Continuity plates shall be welded to column webs using groove welds or fillet welds.

The required strength of the sum of the welded joints of the continuity plates to the column web shall be the smallest of the following:

(a) The sum of the design strengths in tension of the contact areas of the continuity plates to the column flanges that have attached beam flanges.

(b) The design strength in shear of the contact area of the plate with the column web.

(c) The design strength in shear of the column panel zone.

(d) The sum of the expected yield strengths of the beam flanges transmitting force to the continuity plates.

Continuity Plates Welding
Along the web, the corner clip shall be detailed so that the clip extends a distance of at least 11/2 in. (38 mm) beyond the published “k” detail dimension for the rolled shape. Along the flange, the plate shall be clipped to avoid interference with the radius of the rolled shape and shall be detailed so that the clip does not exceed a distance of 1/2 in. (12 mm) beyond the published “k1” detail dimension.

The clip shall be detailed to facilitate suitable weld terminations for both the flange weld and the web weld. When a curved clip is used, it shall have a minimum radius of 1/2 in. (12 mm).

At the end of the weld adjacent to the column web/flange juncture, weld tabs for continuity plates shall not be used, except when permitted by the engineer of record. Unless specified to be removed by the engineer of record, weld tabs shall not be removed when used in this location.

Where continuity plate welds are made without weld tabs near the column fillet radius, weld layers shall be permitted to be transitioned at an angle of 0° to 45° measured from the vertical plane. The effective length of the weld shall be defined as that portion of the weld having full size. Non destructive testing (NDT) shall not be required on the tapered or transition portion of the weld not having full size.

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