engineering concepts chapter 4 terms. abutment the part of a structure that directly receives thrust...
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Engineering Concepts Chapter 4 Terms
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ABUTMENTThe part of a structure
that directly receives thrust
or pressure.
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ARCH BRIDGE A bridge that uses long
span arches for support.
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BEAM BRIDGE A bridge whose main
structural element consists of a beam set across two or more vertical supporting members.
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BUCKLE Failure caused by
bending, giving way, or crumpling due to excessive force.
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BRITTLE The description for a
material which is neither ductile nor malleable and will fail suddenly without warning.
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COMPRESSION The effect of a force
which tends to shorten an object in the direction of the force. For example, the towers of a suspension bridge are in compression.
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DEAD LOAD A permanent part of a
structure. A dead load does not change over time.
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DENSITY Mass per unit volume.
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DYNAMIC LOAD A quick exertion of
force such as an explosion, collision, etc.
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ELASTIC DEFORMATION RANGE A range during
material testing where if the load is released the material will return to its initial size and shape.
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FIXTURE Apparatus used in
manufacturing processes to assemble large pieces of material in a consistent fashion.
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FREE-BODY DIAGRAM A sketch of an object
(body) of interest with all the surrounding objects stripped away and all of the forces acting on the object (body) shown.
TAETAC
TAB
TAD
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JIG Apparatus used in
manufacturing processes to assemble or measure pieces of material in a consistent fashion, smaller than a fixture and can be moved.
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LIVE LOAD A load moving across
or within a structure.
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MOMENT OF INERTIA An indication of the
stiffness of a particular shape. The higher the moment of inertia, the less the deflection.
MOI .
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NEWTON’S FIRST LAW (The Law of Inertia) –
Objects at rest tend to stay at rest, and objects in motion tend to stay in motion at a constant speed in a straight line unless acted upon by an unbalanced force.
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NEWTON’S SECOND LAW The net force acting on
an object in a given direction is equal to the mass of the object multiplied by the acceleration of the object in the same direction as the net force.
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NEWTON’S THIRD LAW The force of one object
(object 1) acting on another object (object 2) is equal in magnitude and opposite in direction to the force of the second object acting upon the first.
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PLASTIC DEFORMATION RANGE A range during
material testing where the material will not return to its initial size and shape.
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REACTIONS Reactions are passive
forces that are induced at the supports of a structure.
70o 70o
40o
8N
Ra = 4N Rb = 4N
a b
cx
y
12 cm
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STATICS The study of objects in
a state of equilibrium.
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STATIC LOAD A load that
accumulates over time.
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STRESS-STRAIN CURVE A graph of stress (on
the y-axis) versus strain (on the x-axis) for materials under stress; enables engineers to learn about the strength of material as it deforms elastically and plastically.
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SUSPENSION BRIDGE A bridge having a road
or deck hung from a pair of steel cables, each carried by two towers, one at each bank; e.g., the Golden Gate Bridge over San Francisco Bay.
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TENSION A situation in which
force is applied to an object that stretches, expands or lengthens the object.
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TENSILE Of or relating to
tension; a “tensile” force is a force that serves to stretch, expand, or lengthen an object.
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TRUSS A large structural
member that consists of many smaller parts, typically in a repeating pattern of geometric shapes.
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YIELD