Question

Tis 15 - 4 @ 7.5 ft = 30 ft- Figure 1: Floor plan - be= 134 in slab 1 3 in deck W16 X 31 Figure 2: Interior beam cross section

i have to compute the nominal strength of the composite section below and i have slab and deck so by using the equation of
Cc = 0.85 fc' beff ts for the compressive force in the concret.
which value should i take for ts thickness slab ? is it ts= 3.25 or ts= 3.25+3?

Answer 1

C_c = 0.85 F_c' b t

here b is the width of the concrete slab

t is the thickness of the slab

F_c' is the compressive strength of concrete.

take t = 3.25 that is the thickness of the slab

here the total thickness is 6.25 just subtract the deck thickness from it.