NHI Safety Inspection of In-Service Bridges FINAL
EXAM QUESTIONS WITH ANSWERS SOLVED
CORRECT.
Acceptable approach guardrail ends - CORRECT ANSWER✅✅sequential kinking
terminal
redirective non-gating crash cushion
slotted rail terminal
Acoustic Emission Testing - CORRECT ANSWER✅✅elastic waves generated by rapid
release of engird
listen for sounds from active deficiencies
materials under stress is low energy and inaudible
acoustic wave testing - CORRECT ANSWER✅✅delineate areas of internal cracking
and deteriorated concrete
adjacent box beam - CORRECT ANSWER✅✅placed side by side, no space between
span 20 to 130 feet
most economical ranging 40 to 90 feet
may incorporate shear keys
top flange may serve as deck
aerial obstruction lighting - CORRECT ANSWER✅✅used to alert aircraft that a hazard
exists below
aggradation - CORRECT ANSWER✅✅progressive buildup of the longitudinal profile of
a channel bed due to sediment deposition
approach guardrail ends - CORRECT ANSWER✅✅traffic friendly systems that
minimize the barrier end's threat as a hazardous object within the roadside area
approach guardrails - CORRECT ANSWER✅✅keep motorist from hazardous features
beneath bridge and extended away to keep motorist from any hazardous roadside
features
arch bridge - CORRECT ANSWER✅✅resist axil compression
each span considered simple
Primary (arch ribs, spandrel bent and bent caps, spandrel columns, deck and floor
system)
Secondary (arch struts)
, Armoring countermeasures - CORRECT ANSWER✅✅resist erosive forces caused by
the flow, but tend not to alter the flow significantly
Assembly joint with seal- plank - CORRECT ANSWER✅✅steel reinforced neoprene
that supports vehicular loads over the joint and allow for movement up to 4 inches
Assembly joint with seal- sheet - CORRECT ANSWER✅✅two blocks of steel
reinforced neoprene. thin sheet of neoprene spans the joint and connects the two
blocks. Allows for up to 4 inches
Assembly joint without seal- finger plate - CORRECT ANSWER✅✅tooth plate joint, two
steel plates that have interlocking fingers. usually on longer spans. can accommodate
movement from 4 to 24 inches
Assembly joint without seal- sliding plate - CORRECT ANSWER✅✅two steel plates
sliding on top of one another with maximum movement of 4 inches
barriers on bridges - CORRECT ANSWER✅✅provide vehicular containment, prevent
rollover, minimize snagging and spinout, provide smooth vehicular redirection within
accepted deceleration limits
box beams - CORRECT ANSWER✅✅precast prestressed
made composite with shear connectors
large void in the middle
increased strength while decreasing dead load
top and bottom act as flanges, sides act as webs
span length depends on configuration and beam spacing
Primary (box beams)
Secondary (end & intermediate diaphragms)
box girder - CORRECT ANSWER✅✅support entire roadway width
top flange = deck
bottom flange
multiple webs
increased strength while reducing dead load
not composite
distances up to 1000 feet
multiple segments or monolithic
Primary (box girder)
Secondary (external diaphragms)
caissons - CORRECT ANSWER✅✅deep foundations used to carry substructure loads
from bridge through unsound soil and water to sound soil or rock
EXAM QUESTIONS WITH ANSWERS SOLVED
CORRECT.
Acceptable approach guardrail ends - CORRECT ANSWER✅✅sequential kinking
terminal
redirective non-gating crash cushion
slotted rail terminal
Acoustic Emission Testing - CORRECT ANSWER✅✅elastic waves generated by rapid
release of engird
listen for sounds from active deficiencies
materials under stress is low energy and inaudible
acoustic wave testing - CORRECT ANSWER✅✅delineate areas of internal cracking
and deteriorated concrete
adjacent box beam - CORRECT ANSWER✅✅placed side by side, no space between
span 20 to 130 feet
most economical ranging 40 to 90 feet
may incorporate shear keys
top flange may serve as deck
aerial obstruction lighting - CORRECT ANSWER✅✅used to alert aircraft that a hazard
exists below
aggradation - CORRECT ANSWER✅✅progressive buildup of the longitudinal profile of
a channel bed due to sediment deposition
approach guardrail ends - CORRECT ANSWER✅✅traffic friendly systems that
minimize the barrier end's threat as a hazardous object within the roadside area
approach guardrails - CORRECT ANSWER✅✅keep motorist from hazardous features
beneath bridge and extended away to keep motorist from any hazardous roadside
features
arch bridge - CORRECT ANSWER✅✅resist axil compression
each span considered simple
Primary (arch ribs, spandrel bent and bent caps, spandrel columns, deck and floor
system)
Secondary (arch struts)
, Armoring countermeasures - CORRECT ANSWER✅✅resist erosive forces caused by
the flow, but tend not to alter the flow significantly
Assembly joint with seal- plank - CORRECT ANSWER✅✅steel reinforced neoprene
that supports vehicular loads over the joint and allow for movement up to 4 inches
Assembly joint with seal- sheet - CORRECT ANSWER✅✅two blocks of steel
reinforced neoprene. thin sheet of neoprene spans the joint and connects the two
blocks. Allows for up to 4 inches
Assembly joint without seal- finger plate - CORRECT ANSWER✅✅tooth plate joint, two
steel plates that have interlocking fingers. usually on longer spans. can accommodate
movement from 4 to 24 inches
Assembly joint without seal- sliding plate - CORRECT ANSWER✅✅two steel plates
sliding on top of one another with maximum movement of 4 inches
barriers on bridges - CORRECT ANSWER✅✅provide vehicular containment, prevent
rollover, minimize snagging and spinout, provide smooth vehicular redirection within
accepted deceleration limits
box beams - CORRECT ANSWER✅✅precast prestressed
made composite with shear connectors
large void in the middle
increased strength while decreasing dead load
top and bottom act as flanges, sides act as webs
span length depends on configuration and beam spacing
Primary (box beams)
Secondary (end & intermediate diaphragms)
box girder - CORRECT ANSWER✅✅support entire roadway width
top flange = deck
bottom flange
multiple webs
increased strength while reducing dead load
not composite
distances up to 1000 feet
multiple segments or monolithic
Primary (box girder)
Secondary (external diaphragms)
caissons - CORRECT ANSWER✅✅deep foundations used to carry substructure loads
from bridge through unsound soil and water to sound soil or rock
