# Resistance of rectangular solid sections subjected to torsion and shear: the condition for minimum reinforcement

## Eurocode 2 part 1-1: Design of concrete structures 6.3.2 (5)

For approximately rectangular solid sections, only minimum reinforcement is required if the following condition is satisfied:

T / _{Ed}T + _{Rd,c}V / _{Ed}V ≤ 1,0 _{Rd,c} | (6.31) |

where:

`T`_{Ed}- is the design torsional moment
`V`_{Ed}- is the design transverse force
`T`_{Rd,c}- is the torsional cracking moment
`T`= 2_{Rd,c}`A`_{k}`t`_{ef,i}`f`_{ctd}(6.26) while setting `τ`=_{t,i}`f`_{ctd}with

`A`_{k}- the area enclosed by the centre-lines of the connecting walls, including inner hollow areas, see Figure 6.11
`t`_{ef,i}- the effective wall thickness, see Figure 6.11
`f`_{ctd}- the design tensile strength of concrete, see § 3.1.6 (2)P.

`V`_{Rd,c}- is the design shear resistance of members not requiring design shear reinforcement .

This application calculates the resistance to torsion and shear from your inputs. Intermediate results will also be given.