ungrouted. In some cases, units are placed with cells
Joint: That portion of a column bounded by the highest
running vertically, and may or may not be grouted.
and lowest surfaces of the other members framing into it.
Collar Joint: Vertical longitudinal joint between
Lateral-Force-Resisting System: Those elements of the
wythes of masonry or between masonry wythe and
back-up construction that may be filled with mortar or
structure that provide its basic lateral strength and stiffness,
grout.
and without which the structure would be laterally unstable.
Composite Masonry Wall: Multiwythe masonry
Load:
wall acting with composite action.
Dead Load: The gravity load due to the weight of all
Concrete Masonry: Masonry constructed with solid
permanent structural and nonstructural components
of
or hollow units made of concrete. Hollow concrete
Load continued:
units may be ungrouted, or grouted.
Head Joint: Vertical mortar joint placed between
a building such as walls, floors, roofs, and the
operating weight of fixed service equipment.
masonry units in the same wythe.
Gravity Load (W): The total dead load and
Hollow Masonry Unit: A masonry unit whose net
applicable portions of other loads as defined in Sec.
cross-sectional area in every plane parallel to the
5.3.2 of NEHRP' 7.
9
bearing surface is less than 75% of the gross cross-
sectional area in the same plane.
Live Load: The load superimposed by the use and
Infill: A panel of masonry placed within a steel or
occupancy of the building not including the wind
load, earthquake load, or dead load; see Sec. 5.3.2 of
concrete frame. Panels separated from the
NEHRP' 7.
9
surrounding frame by a gap are termed "isolated
infills." Panels that are in tight contact with a frame
LRFD (Load and Resistance Factor Design): A
around its full perimeter are termed "shear infills."
method of proportioning structural components
In-plane Wall: See shear wall.
(members, connectors, connecting elements, and
assemblages using load and resistance factors that no
applicable limit state is exceeded when the structure
Nonbearing Wall: A wall that is designed and
is subjected to all design load combinations.
detailed so as not to participate in providing support
for gravity loads.
Masonry: The assemblage of masonry units, mortar, and
possibly grout and/or reinforcement. Types of masonry are
Noncomposite Masonry Wall: Multiwythe masonry
classified herein with respect to the type of the masonry
wall acting without composite action.
units, such as clay-unit masonry, concrete masonry, or
hollow-clay tile masonry.
Out-of-plane Wall: A wall that resists lateral forces
applied normal to its plane.
Bed Joint: The horizontal layer of mortar on which
a masonry unit is laid.
Parapet: Portions of a wall extending above the roof
diaphragm. Parapets can be considered as flanges to
Cavity Wall: A masonry wall with an air space
roof diaphragms if adequate connections exist or are
between wythes. Wythes are usually joined by wire
provided.
reinforcement, or steel ties. Also known as a
noncomposite wall.
Partially Grouted Masonry Wall: A masonry wall
containing grout in some of the cells.
Clay-Unit Masonry: Masonry constructed with
solid, cored, or hollow units made of clay. Hollow
Perforated Wall or Infill Panel: A wall or panel not
clay units may be ungrouted, or grouted.
meeting the requirements for a solid wall or infill
panel.
Clay Tile Masonry: Masonry constructed with
hollow units made of clay tile. Typically, units are
Pier: A vertical portion of masonry wall between two
laid with cells running horizontally, and are thus
horizontally adjacent openings. Piers resist axial
C-5
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