NHI 130055 Midterm (Modules 1.0 - 5.2) || Answers 100% Rated
Correct.
3 Primary Bridge Components (in order) correct answers 1. Deck
2. Superstructure
3. Substructure
Elements of a Deck correct answers Deck
Wearing Surface
Bridge Railing
Sidewalk
Expansion Joint
Elements of a Superstructure correct answers Girder
Floorbeam
Stringer
Truss
Arch
Spandrel Columns
Cables
Cross Girder
Pin & Hanger Assemblies
Elements of a Substructure correct answers Columns/Piles
Walls
Abutments
Wingwalls
,Pier Caps
Load Path correct answers Deck
Superstructure
Bearings
Substructure
Subsurface
Function of Deck correct answers Supports live load
Function of Superstructure correct answers Transfers loads from deck to bearings and
substructure
Function of Bearings (load path) correct answers Transmit loads from superstructure to
substructure
Function of Bearings (Other) correct answers Permits longitudinal expansion and contraction
Allows rotation caused by dead and live deflection
Function of Substructure correct answers Transfers loads from deck and superstructure into the
ground
Function of Culverts correct answers transmit the flow of water from one side of roadway to the
other (hydraulic structures that are typically underfill)
Axial Force correct answers A force which acts through the longitudinal axis of a member
Bending Moment correct answers A combination of tension and compression forces developed
when an external load is applied transversely to a bridge member, causing it to bend
, Shear Force correct answers Results from equal but opposite transverse forces which tend to
slide one section of a member past the adjacent section
Torsional Force correct answers An external moment which tends to rotate or twist a member
about its longitudinal axis.
Stress correct answers Force per unit area and it denotes intensity of an internal force; may be
tension, compression, or shear
Deformation correct answers Local distortion or the change in shape of material due to applied
force
Strain correct answers Measure of deformation and it denotes around an object deforms WRT its
original dimensions
Creep correct answers Gradual, continuing irreversible deformation due to constant stress level
below yield strength
Fatigue correct answers Tendency of a member to fail at stress below the yield stress when
subjected to cyclical loading
Elasticity correct answers Modulus of elasticity is the ration between the stress applied and
resulting elastic strain
Ductility correct answers Characteristic to undergo plastic deformation prior to failure
Brittleness correct answers Characteristic to fail while exhibiting little to no plastic deformation
prior to failure; can occur suddenly and without warning
Correct.
3 Primary Bridge Components (in order) correct answers 1. Deck
2. Superstructure
3. Substructure
Elements of a Deck correct answers Deck
Wearing Surface
Bridge Railing
Sidewalk
Expansion Joint
Elements of a Superstructure correct answers Girder
Floorbeam
Stringer
Truss
Arch
Spandrel Columns
Cables
Cross Girder
Pin & Hanger Assemblies
Elements of a Substructure correct answers Columns/Piles
Walls
Abutments
Wingwalls
,Pier Caps
Load Path correct answers Deck
Superstructure
Bearings
Substructure
Subsurface
Function of Deck correct answers Supports live load
Function of Superstructure correct answers Transfers loads from deck to bearings and
substructure
Function of Bearings (load path) correct answers Transmit loads from superstructure to
substructure
Function of Bearings (Other) correct answers Permits longitudinal expansion and contraction
Allows rotation caused by dead and live deflection
Function of Substructure correct answers Transfers loads from deck and superstructure into the
ground
Function of Culverts correct answers transmit the flow of water from one side of roadway to the
other (hydraulic structures that are typically underfill)
Axial Force correct answers A force which acts through the longitudinal axis of a member
Bending Moment correct answers A combination of tension and compression forces developed
when an external load is applied transversely to a bridge member, causing it to bend
, Shear Force correct answers Results from equal but opposite transverse forces which tend to
slide one section of a member past the adjacent section
Torsional Force correct answers An external moment which tends to rotate or twist a member
about its longitudinal axis.
Stress correct answers Force per unit area and it denotes intensity of an internal force; may be
tension, compression, or shear
Deformation correct answers Local distortion or the change in shape of material due to applied
force
Strain correct answers Measure of deformation and it denotes around an object deforms WRT its
original dimensions
Creep correct answers Gradual, continuing irreversible deformation due to constant stress level
below yield strength
Fatigue correct answers Tendency of a member to fail at stress below the yield stress when
subjected to cyclical loading
Elasticity correct answers Modulus of elasticity is the ration between the stress applied and
resulting elastic strain
Ductility correct answers Characteristic to undergo plastic deformation prior to failure
Brittleness correct answers Characteristic to fail while exhibiting little to no plastic deformation
prior to failure; can occur suddenly and without warning
