# D14.C.6.5 Shear

Per section 13.4.1, the factored shear resistance, Vr , developed by the web of a flexural member, shall be taken as

Vr = ϕAv fs

where
 Av = = the shear area twh
1. f s = 0.66f y when $h w t w ≤ 440 k v f y$

where
 kv = = the shear buckling coefficient defined as:
2. fs = fcri when $440 k v f y < h w t w ≤ 500 k v f y$

where
 fcri = $= 290 f y k v ( h w / t w )$ kv = = is as defined in (a)
3. fs = fcri + ft when $500 k v f y < h w t w ≤ 620 k v f y$

where
 ft = the tension field post-buckling stress defined as: = ka(0.50fy - 0.866fcri) ka = the aspect coefficient defined as: $= 1 1 + ( s / h w ) 2$
4. fs = fcre + ft when $620 k v f y < h w t w$

where
 ft = the tension field post-buckling stress defined as: = ka(0.50fy - 0.866fcre) fcre = $= 180 , 000 k v ( h w / t w ) 2$ kv = as defined in (a)