(b) One-way joist systems in accordance with 9.8
(a) The overhanging flange width shall include that portion of slab on each side of the beam extending a distance equal to the projection of the beam above or below the slab, whichever is greater, but not greater than four times the slab thickness.
(b) The overhanging flanges shall be neglected in cases where the parameter Acp2/pcp for solid sections or Ag2/pcp for hollow sections calculated for a beam with flanges is less than that calculated for the same beam ignoring the flanges.
|Support condition||Minimum h|
|One end continuous||ℓ/18.5|
|Both ends continuous||ℓ/21|
(a) Support reaction, in direction of applied shear, introduces compression into the end region of the beam
(c) No concentrated load occurs between the face of support and critical section
Table 220.127.116.11—Cases where Av,min is not required if 0.5ϕVc < Vu ≤ ϕVc
|Shallow depth||h ≤ 10 in.|
|Integral with slab||h ≤ greater of 2.5tf or 0.5bw
h ≤ 24 in.
|Constructed with steel fiber-reinforced normalweight concrete conforming to 18.104.22.168.1(a), 22.214.171.124(d), and 126.96.36.199(a) and with f'c ≤ 6000 psi||h ≤ 24 in.
|One-way joist system||In accordance with 9.8|
Table 188.8.131.52—Required Av,min
|Nonprestressed and prestressed with Apsfse< 0.4(Apsfpu + Asfy)||Greater of:||(a)|
|Prestressed with Apsfse≥ 0.4(Apsfpu+ Asfy)||Lesser of:||Greater of:||(c)|
(a) Vu ≤ (2/3)ϕVn at the cutoff point
(b) For No. 11 bars and smaller, continuing reinforcement provides double the area required for flexure at the cutoff point and Vu ≤ (3/4)ϕVn
(c) Stirrup or hoop area in excess of that required for shear and torsion is provided along each terminated bar or wire over a distance 3/4d from the termination point. Excess stirrup or hoop area shall be at least 60bws/fyt. Spacing s shall not exceed d/(8βb)
(a) ℓd ≤ (1.3Mn/Vu + ℓa) if end of reinforcement is confined by a compressive reaction
(b) ℓd ≤ (Mn/Vu + ℓa) if end of reinforcement is not confined by a compressive reaction
Mn is calculated assuming all reinforcement at the section is stressed to fy, and Vu is calculated at the section. At a support, ℓa is the embedment length beyond the center of the support. At a point of inflection, ℓa is the embedment length beyond the point of inflection limited to the greater of d and 12db.
(a) At least one-quarter of the maximum positive moment reinforcement, but not less than two bars or strands, shall be continuous
(b) At least one-sixth of the negative moment reinforcement at the support, but not less than two bars or strands, shall be continuous
(a) At least one-quarter of the maximum positive moment reinforcement, but not less than two bars or strands, shall be continuous.
(a) Clear span does not exceed four times the overall member depth h
(b) Concentrated loads exist within a distance 2h from the face of the support