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# 22.6.5 *Two-Way Shear Strength Provided by Concrete*

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*v*shall be calculated in accordance with Table 22.6.5.2.

_{c}**Table 22.6.5.2—Calculation of v_{c} for two-way shear**

v_{c} | ||
---|---|---|

Least of (a), (b), and (c): | (a) | |

(b) | ||

(c) |

Note: β is the ratio of long side to short side of the column, concentrated load, or reaction area and α_{s} is given in 22.6.5.3.

For prestressed, two-way members, it shall be permitted to calculate

**using 22.6.5.5, provided that (a) through (c) are satisfied:***v*_{c}(a) Bonded reinforcement is provided in accordance with 8.6.2.3 and 8.7.5.3

(b) No portion of the column cross section is closer to a discontinuous edge than four times the slab thickness *h*

(c) Effective prestress ** f_{pc}** in each direction is not less than 125 psi

For prestressed, two-way members conforming to 22.6.5.4,

**shall be permitted to be the lesser of (a) and (b):***v*_{c}(a) | (22.6.5.5a) |

(b) | (22.6.5.5b) |

where **α _{s}** is given in 22.6.5.3; the value of

**is the average of**

*f*_{pc}**in the two directions and shall not exceed 500 psi;**

*f*_{pc}**is the vertical component of all effective prestress forces crossing the critical section; and the value of shall not exceed 70 psi.**

*V*_{p}### Related Code Sections

22.6.5 Sectional Strength,

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—Calculation of v c for

*two*-*way**shear*v c Least of (a), (b), and (c): (a) (b) (c) Note: β ...
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in such combinations as stipulated in this Code
v c
=
stress corresponding to nominal

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*Shear*