T-BEAM GEOMETRY as per ACI 318-19

For non-prestressed T-beams supporting monolithic or composite slabs, the effective width bf shall include the beam web width bw plus an effective overhanging flange width in accordance with the following Table, where h is the slab thickness and sw is the clear distance to the adjacent web.

Condition: Isolated non-prestressed T-beams in which the flange is used to provide additional compression area shall have a flange thickness greater than or equal to 0.5bw and an effective flange width less than or equal to 4bw. 

Note: In ACI 318-11, the width of the slab effective as a T-beam flange was limited to one-fourth the span. the Code now allows one-eighth of the span on each side of the beam web. This was done to simplify the above Table and has negligible impact on designs.

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Reference: ACI 318-19

Written By: Muhammad Abrar (m.abrarahmad477@gmail.com)