1. Reinforced Concrete Design-4 Design of T beams
By Dr. Attaullah Shah Swedish College of Engineering and Technology Wah Cantt.

2. Quick 30 minutes- Open Book Quiz
Compare WSD and USD methods. (5 min)
Design a simply supported singly reinforced concrete beam of span 15 ft having a superimposed dead load of 1K/ft and live load of 1.5K/ft. fc’ = 4000 psi and fy= 60000psi (15min)
Determine the moment capacity of doubly reinforced beam of size 12inx18in having 6#8 bars in the bottom and 2#8 bars at the top. Use the above material stresses. (10min).

3. T Beams

8. Case 1: Compression area in Flange a<t
If the depth of equivalent stress block is equal or less than flange depth, the beam may be designed as rectangular beam.
In such case
Nominal moment Capacity
If the thickness of a > t, then T beam analysis will be required

9. Case 1: Compression area in web a>t
The tensile force in steel T is resisted by two components one C1corresponding to A1 and other C2 corresponding to A2
Compression

10. Area of steel corresponding to compression in Flange is given as
The nominal resisting moment by flange is given as
The remaining steel area ( As-Asf) is compensated by the compression in web.
The additional resisting moment is given as
The total nominal resisting moment is given as:

11. Maximum and Minimum Steel
For Case
The area of steel reinforcement As is given as
The balanced steel ratio is given as
The balanced steel ratio is given as (87000/(87000+fy))
For Case 2

12. Design Steps for T-beam