Two-Way Shear Capacity
Two-way shear, or punching shear, is taken for a section that is a distance of 1.5d (BS8110: Part 1, Section 3.7.7.6) from the edge of the concrete column (or modified base plate dimensions). It is also checked at the column face to be the lesser of
The shear capacity is calculated using the same equation in BS8110: Part 1, Table 3.8, Note 2 with b substituted for bo - the perimeter length of the critical section.
The ultimate applied shear Vu on the critical section is calculated as:
Equation 5-2 |