RAM Structural System Help

Beam Shear

Beam shear critical section is taken at dp/5 from inside edge of row of piles closest to column face. All piles outside of this area are considered in calculating the required shear capacity. If the distance from face of column to shear critical section is greater than 1.5d then shear enhancement is not permitted. Where shear enhancement is allowed if the pile spacing is greater than 3dp, the shear enhancement is only applied to a strip equal 3dp to centered on each pile. (Chapter 7 - Design of Pile Foundations p313)

V = Σ P p u b d ≤ v c or v c 1
where
ΣPpu
=
Sum of all pile reactions at ultimate loading on left of section
d
=
average effective depth of critical section
b
=
critical section width
Enhanced concrete capacity:
v c 1 = v c ( 2 d a v ) ≤ 0.8 f c u or 5 N/mm 2
v c ≤ 0.8 f c u or 5 N/mm 2

Shear Critical Section location

Parent topic: Analysis and Design of Pile Cap Foundations