Concrete Design Ali N. Attiyah, Ph.D.
Fourth Year 2015-2016
1
Lecture six
Direct Design Method
The seventh step of DDM is to calculate the shear forces in slabs with beams according to
ACI 8.10.8.
Concrete Design Ali N. Attiyah, Ph.D.
Fourth Year 2015-2016
2
To simplify calculating the column strip moments, the following interpolation equations
can be used.
The torsional member for flat plate and flat slab is calculated from ACI 8.11.5.1.
Concrete Design Ali N. Attiyah, Ph.D.
Fourth Year 2015-2016
3
Reinforcement Limits
Flexural reinforcement calculated to resist bending moments found from DDM shall
satisfy the minimum limit of reinforcement according to the following table:
Reinforcement Detailing
Flexural reinforcement calculated to resist bending moments found from DDM shall be
detailed according the following ACI requirements.
The concrete cover is calculated from the following provision:
Concrete Design Ali N. Attiyah, Ph.D.
Fourth Year 2015-2016
4
Example:
The spacing between flexural reinforcement shall satisfy the following provision: