more details of one way slab

Lecture 6 – One-Way Slabs

 

      A one-way slab is supported by parallel walls or beams, and the main
tension reinforcing bars run parallel to the span. It looks like the following:

The slab is designed as a series of 1’-0” wide beam “strips”. The analysis
is similar to rectangular beams, except the width b = 12” and the height is
usually on the order of 4” → 10”. The main tension bars are usually #4, #5
or #6 bars. There are no stirrups in slabs, however, additional bars are
placed perpendicular to the main tension bars to prevent cracking during
the curing process. These bars are referred to as “shrinkage” or
“temperature” bars and are also usually #4 or #5 bars.

Maximum spacing between main tension bars = smaller of
Spacing reqd. for moment
or
3 x slab thickness
or
12”
Maximum spacing between shrinkage bars = smaller of
Spacing reqd. by analysis
or
5 x slab thickness
or
18”

Design of Main Tension Bars:

As previously mentioned, slabs are designed as a series of 1’-0” wide
rectangular beam “strips” as shown below