leelaker escribió:Perdón en el anterior mensaje escribí concreto mínimo hago a concreto masivo.
Saludos
ACI 318M-11 dice:
7.12.2 — Deformed reinforcement conforming to 3.5.3
used for shrinkage and temperature reinforcement
shall be provided in accordance with the following:
7.12.2.1 — Area of shrinkage and temperature
reinforcement shall provide at least the following ratios
of reinforcement area to gross concrete area, but not
less than 0.0014:
(a) Slabs where Grade 280 or 350
deformed bars are used .................................0.0020
(b) Slabs where Grade 420
deformed bars or welded wire
reinforcement are used...................................0.0018
(c) Slabs where reinforcement
with yield stress exceeding 420 MPa
measured at a yield strain of
0.35 percent is used ...........................
7.12.2.2 — Shrinkage and temperature reinforcement
shall be spaced not farther apart than five times the
slab thickness, nor farther apart than 450 mm.
7.12.2.3 — At all sections where required, reinforcement
to resist shrinkage and temperature stresses shall
develop fy in tension in accordance with Chapter 12.