Beam Stability per ACI 318-19 with ideCAD

How does ideCAD define T-beam effective width according to ACI 318-19?


  • In T-Beam construction, effective flange width is determined an applied automatically.


Notation

bf = effective flange width, in.
bw = web width or diameter of circular section, in.
h = overall thickness, height, or depth of member, in.
ln = length of clear span measured face-to-face of supports, in.
sw = clear distance between adjacent webs, in.


In nonprestressed T-Beam monolithic concrete construction, the effective flange width, bf, equals the beam width bw, plus an effective overhanging flange width in accordance with ACI Table 6.3.2.1.

Flange location

T-beam overhanging flange width

Flange location

T-beam overhanging flange width

Eacg side of web

One side of web

h is the slab thickness and sw is the clear distance to the adjacent web.

 

According to ACI 6.3.2.2, isolated nonprestressed T-beams as used to provide additional compression area, should have a flange thickness greater than or equal to 0.5bw and an effective flange width less than or equal to 4bw.