For section with multiple values of f’c, the minimum
f’c is used.
Where the design yield strength of shear reinforcement,
fsy.f is used in calculations, it is limited to 500
MPa per Table 3.2.1.
In beams, transverse reinforcement consists of transverse reinforcement
perpendicular to the axis of the member.
Where the vertical component of prestress Pv increases
shear or when Pv is greater than the demand shear,
V* for a design envelope, the design shear will be taken as
1.2Pv + V* per clauses 8.2.1.3 and
2.5.2.2(b).
Effective web width, bv is calculated in accordance with
8.2.1.5 with kd taken as 0.5 for bonded ducts and 1.2
for unbonded ducts. Ducts (bonded tendons only) with dd <
bw/8 are ignored in this calculation. The effective
shear depth, dv, is calculated in accordance with
8.2.1.9 with d taken as the depth to the resultant tension force.
Minimum reinforcement is calculated in accordance with 8.2.1.7.
Vu is calculated using clause 8.2.3.1, ignoring the
vertical component of prestress Pv.
Vu,max is calculated using equation 8.2.3.3(1), ignoring
the vertical component of prestress Pv.
Vuc is calculated using equation 8.2.4.1 where
√fc’ does not exceed 8.0 MPa and
kv is calculated according to the general method
of clause 8.2.4.2.
In the calculation of kdg the maximum aggregate size is
taken as 20 mm and the limitations for high strength concrete and lightweight
concrete are considered.
RAM Concept rigorously calculates the longitudinal strain parameter,
εx using a strain compatibility analysis. A
shear/torsion tension is added to the cross-section demand forces used for
calculation of εx. This tension is calculated using the
shear component in equations 8.2.4.2.2, with Pv taken as
zero and without the simplifying assumption that cot θ = 2. The
εx values are limited to a minimum value of
-0.2×10-3 and a maximum value of
3.0×10-3. In compression fan regions near
supports where the diagonal shear strut angle is steeper, the shear tension
diminishes on one face to zero at the face of support, based upon the orientation of
the diagonal shear strut.
In accordance with 8.2.4.5, if another loading case occurs which causes cracking on
the compression face of the case being calculated, the longitudinal strain parameter
is taken as the maximum value of 3.0×10-3 to reflect the
potential for reduced aggregate interlock due to load reversal cracking.
Longitudinal spacing of transverse shear fitments are limited by clause 8.3.2.2.
Transverse spacing is not checked.
