Page Comparison

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1. Calculate factored loading at a section

2. Calculate the shear and torsional constant (X²Y)).  The quantity X²Y term is based on the sum of the component rectangles in the member, where X is the shorter dimension and Y is the longer dimension of each component rectangle.  The designer should select the components such that the computed sum of X²Y terms is maximized.  Also note that the overhanging flange width used in this calculation should not be greater than three times the flange thickness.

3. Check if torsion may be neglected (threshold torsion)

4. Check the maximum allowable torsional moment and maximum allowable shear

5. Calculate the nominal torsional moment strength provided by the concrete under pure torsion (T’_c)

6. Calculate the nominal shear strength provided by the concrete without torsion (V’_c)

7. Calculate the nominal torsional moment under combined loading (T_c)

8. Calculate the nominal shear strength under combined loading (V_c)

9. Compute transverse reinforcement required for torsion, A_t,reqd (per face).  Note that the x₁ and y₁ terms used in this equation are the centerline dimensions of the closed stirrups used, and not necessarily equivalent to the X and Y terms previously used in the torsional constant.

10. Compute transverse reinforcement required for shear, A_v,reqd (total)

11. Calculate the combined transverse reinforcement, A_v/2 + A_t (per face)

12. Check minimum amount of web reinforcement required for ductility, A_v + 2A_t (total)

13. Calculate the maximum allowable stirrup spacing (use ACI requirements here)

14. Calculate the longitudinal torsional reinforcement, A_l (total) (does not appear to have a minimum required for this reinforcement)

15. Check the end regions for plate bending (PCI Handbook 5.4.3)

16. Calculate any required hanger steel and compare to the combined transverse steel

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