TM 5-809-1/AFM 88-3, Chap. 15
g. Vibratory loads. Dynamic and/or oscillatory
This manual prescribes the criteria for the design of
h. Design load. The effects of stationary live,
concrete floor slabs on grade in buildings for heavy
dead, and wall loads and moving live loads. Dead
loads and is applicable to all elements responsible
loads of floor slabs on grade are ignored.
for military construction. Heavy loads in buildings
i. Special soils. Soils which exhibit undesirable
such as warehouses include moving loads, stationary
properties for construction uses such as high com-
live loads, and wall loads.
pressibility or swell potential.
j. Nonreinforced slab. Concrete slab resting on
grade containing minimal distributed steel, usually of
Theoretical concepts, practical applications, basis of
welded wire fabric (WWF), for the purpose of
design, and design procedures for heavy loads are
limiting crack width due to shrinkage and tempera-
discussed in this manual. Related criteria for light-
loaded areas such as office spaces are separately
k. Reinforced slab. Concrete slab resting on grade
treated in TM 5-809-2/AFM 88-3, Chap. 2. Criteria
containing steel reinforcement which consists of
for areas subjected to vibratory loadings are
either a welded wire fabric or deformed reinforcing
included in TM 5-81 8-1/AFM 88-7, Chap. 1. For
design criteria outside the scope of this manual,
industry standards are recommended.
1-4. Basic considerations.
Concrete floor slabs on grade are subjected to a
variety of loads and loading conditions. The design
The following definitions have been adopted for the
procedure includes determining slab thickness based
on moving live loads and then checking adequacy of
a. Slab on grade. Concrete slab supported di-
slab thickness for stationary live load. The design
rectly on foundation soil.
procedure separately includes determining thickness
b. Light loads. Loads which consist of (compa-
of slab under wall load. The entire design procedure
rable) forklift axle load of 5 kips or less and
is based on a working stress concept. Stresses in-
stationary live loads less than 400 pounds per square
duced by temperature gradients and other environ-
mental effects are taken into account by the assign-
c. Heavy loads. Loads which consist of any one
ment of working stresses. Working stresses have
of the following: moving live loads exceeding a
been established empirically based on experience
forklift axle load of 5 kips, stationary live loads
gained in roadway and airfield pavement perform-
exceeding 400 pounds per square foot, and
concentrated wall loads exceeding 600 pounds per
d. Wall load. Concentrated loads imposed by
Appendix A contains a list of references used in this
walls or partitions.
e. Dead load. All the materials composing the
permanent structure, including permanent wall loads
and all equipment that is fixed in position.
f. Live load. Loads imposed by the use and
occupancy of the structure.
(1) Moving live load. Loads imposed by ve-
hicular traffic such as forklift trucks.
(2) Stationary live load. Loads imposed by
movable items such as stored materials.