Design by General Method

For the design of members to resist a known combination of Mf, and Vf, it is appropriate to sub­stitute these values directly into Equation (6) and explicitly determine the value of ex. This value is then substituted into Equation (5) to determine в. If it is not clear whether stirrups are required, the shear strength may then be determined without stirrups first by substitution of ex into Equation (4) with the term sze = dv to see whether the calculated value of Vr = Vc is greater than or equal to the factored load Vf. If the calculated Vc is insufficient, then the engineer may conservatively use this with Equation (1) and solve for the quantity of stirrups (Av/s) which is necessary so that Vr > Vf.

For more accurate results when stirrups are required, the engineer should recalculate Vc as the presence of at least minimum stirrups mitigates the size effect. Equation (4) should therefore be reevaluated with sze = 300 mm to determine the value of Vc for members with stirrups. Then Equation (1) is again used to determine the required quantity of stirrups (Av/s) so that Vr = Vf.

Equation (7) will generally only control near the ends of members where it is necessary to check the anchorage of flexural reinforcement. If the reinforcement detailing is sufficient this check will usually not control here or elsewhere in the member.

Overall, the process above is non-iterative and easy to perform either by hand or with a spread­sheet. The steps required are identical to those used with the 1994 general method, but now there is
no iteration required for design and the use of equations for в and в makes the design much easier to perform, particularly with a spreadsheet.