Concrete Beam-Column Joint Shear Design per ACI 318-19 §15, §18.8

Notation

h = overall thickness, height, or depth of the member.

ideCAD checks the beam-column joint shear limits according to ACI 318-19 Chapter 15

The joint shear design should consider the shear resulting from the moment created by gravity load, wind, earthquake, or other lateral forces at beam-column joints.

According to ACI 15.2.6, if a column extension provides continuity through a beam-column joint in the direction of joint shear, it considered shall satisfy the following two conditions:

• The column extends above the joint at least one column depth, h, measured in the direction of the joint shear considered.

• Longitudinal and transverse reinforcement from the column below the joint is continued through the extension.

According to ACI 15.2.7, if a beam extension provides continuity through a beam-column joint in the direction of joint shear, it considered shall satisfy the following two conditions:

• The beam extends at least one beam depth h beyond the joint face.

• Longitudinal and transverse reinforcement from the beam on the opposite side of the joint is continued through the extension.

According to ACI 15.2.8, for a beam-column joint to be considered confined for the direction of joint shear, two transverse beams should be satisfied the following three conditions:

• The width of each transverse beam is at least three-quarters of the width of the column face into which the beam frames.

• Transverse beams extend at least one beam depth h beyond the joint faces.

• Transverse beams contain at least two continuous top and bottom bars satisfying ACI 9.6.1.2 and No. 3 or more oversized stirrups satisfying ACI 9.6.3.4 and 9.7.6.2.2.