NHI SAFETY INSPECTION OF IN-SERVICE BRIDGES FINAL EXAM | 250+ QUESTIONS | WITH
CORRECT SOLUTIONS PLUS RATIONALES!!!
Question 1
In bridge construction and inspection, where are shear key joints specifically located?
A) At the base of the abutment stem
B) Between pre-cast deck panels
C) At the connection of the floor beam and stringer
D) Within the approach guardrail system
E) At the top of the pier cap
Correct Answer: B) between pre-cast deck panels
Rationale: Shear keys are longitudinal joints filled with high-strength grout that allow
adjacent pre-cast deck panels to act as a single unit. They are designed to transfer shear
forces between the panels, ensuring that the load is distributed across the deck surface
rather than concentrated on a single panel.
Question 2
When inspecting a bridge with pre-cast deck tie rods, where would an inspector most likely find
the anchorage zones?
A) Inside the drainage scuppers
B) Along the primary reinforcement bars
C) At the pre-cast deck tie rods
D) On the face of the wingwalls
E) Within the expansion joint sliding plates
Correct Answer: C) precast deck tie rods
Rationale: Anchorage zones are the specific areas where the concentrated force from a
prestressing or tie-rod system is transferred to the concrete. These areas are prone to high
stress and must be inspected for cracking or spalling that could indicate a failure in the
tensioning system.
Question 3
In reinforced concrete members, flexure cracks are primarily oriented in which direction relative
to the primary reinforcement?
A) Parallel
B) Diagonal (45 degrees)
C) Perpendicular
D) Horizontal only
E) Randomly distributed
Correct Answer: C) perpendicular
Rationale: Flexure cracks occur when the tension in the concrete exceeds its tensile strength,
typically in the center of a span on the bottom of a beam. Because the primary
, 2
reinforcement is placed to resist these tensile forces, the resulting cracks form
perpendicular to the direction of the steel bars.
Question 4
What is considered the main inspection area of concern for Fiber Reinforced Polymer (FRP)
bridges?
A) The density of the resin
B) The UV protection coating
C) The internal rebar
D) The Joints
E) The color of the panels
Correct Answer: D) Joints
Rationale: While FRP is highly resistant to corrosion, the connections and joints are the
most vulnerable points in the system. Inspectors must focus on joints because they are
subject to mechanical wear, adhesive failure, and stress concentrations that do not affect
the main FRP panels as severely.
Question 5
Which type of assembly joint without a seal consists of two steel plates sliding on top of one
another and can accommodate a maximum movement of 4 inches?
A) Finger plate joint
B) Open expansion joint
C) Sliding plate joint
D) Compression joint
E) Cellular joint
Correct Answer: C) sliding plate
Rationale: A sliding plate joint is a simple mechanical joint. It uses one plate attached to the
deck and another to the abutment or adjacent span. It is classified as an "assembly joint
without seal" because it does not provide a watertight barrier, and its movement is
physically limited to approximately 4 inches.
Question 6
A compression joint seal is typically characterized by which of the following?
A) A thin sheet of neoprene used for 1/4 inch movement
B) A rectangle of neoprene with a honeycomb cross-section that can handle 2 inches of
movement
C) Interlocking steel fingers used for 24 inches of movement
D) A pourable liquid sealant with no backing material
E) A series of steel rods used to tie panels together
Correct Answer: B) rectangle of neoprene with a honeycomb cross section. Can handle
movement of 2 inches
CORRECT SOLUTIONS PLUS RATIONALES!!!
Question 1
In bridge construction and inspection, where are shear key joints specifically located?
A) At the base of the abutment stem
B) Between pre-cast deck panels
C) At the connection of the floor beam and stringer
D) Within the approach guardrail system
E) At the top of the pier cap
Correct Answer: B) between pre-cast deck panels
Rationale: Shear keys are longitudinal joints filled with high-strength grout that allow
adjacent pre-cast deck panels to act as a single unit. They are designed to transfer shear
forces between the panels, ensuring that the load is distributed across the deck surface
rather than concentrated on a single panel.
Question 2
When inspecting a bridge with pre-cast deck tie rods, where would an inspector most likely find
the anchorage zones?
A) Inside the drainage scuppers
B) Along the primary reinforcement bars
C) At the pre-cast deck tie rods
D) On the face of the wingwalls
E) Within the expansion joint sliding plates
Correct Answer: C) precast deck tie rods
Rationale: Anchorage zones are the specific areas where the concentrated force from a
prestressing or tie-rod system is transferred to the concrete. These areas are prone to high
stress and must be inspected for cracking or spalling that could indicate a failure in the
tensioning system.
Question 3
In reinforced concrete members, flexure cracks are primarily oriented in which direction relative
to the primary reinforcement?
A) Parallel
B) Diagonal (45 degrees)
C) Perpendicular
D) Horizontal only
E) Randomly distributed
Correct Answer: C) perpendicular
Rationale: Flexure cracks occur when the tension in the concrete exceeds its tensile strength,
typically in the center of a span on the bottom of a beam. Because the primary
, 2
reinforcement is placed to resist these tensile forces, the resulting cracks form
perpendicular to the direction of the steel bars.
Question 4
What is considered the main inspection area of concern for Fiber Reinforced Polymer (FRP)
bridges?
A) The density of the resin
B) The UV protection coating
C) The internal rebar
D) The Joints
E) The color of the panels
Correct Answer: D) Joints
Rationale: While FRP is highly resistant to corrosion, the connections and joints are the
most vulnerable points in the system. Inspectors must focus on joints because they are
subject to mechanical wear, adhesive failure, and stress concentrations that do not affect
the main FRP panels as severely.
Question 5
Which type of assembly joint without a seal consists of two steel plates sliding on top of one
another and can accommodate a maximum movement of 4 inches?
A) Finger plate joint
B) Open expansion joint
C) Sliding plate joint
D) Compression joint
E) Cellular joint
Correct Answer: C) sliding plate
Rationale: A sliding plate joint is a simple mechanical joint. It uses one plate attached to the
deck and another to the abutment or adjacent span. It is classified as an "assembly joint
without seal" because it does not provide a watertight barrier, and its movement is
physically limited to approximately 4 inches.
Question 6
A compression joint seal is typically characterized by which of the following?
A) A thin sheet of neoprene used for 1/4 inch movement
B) A rectangle of neoprene with a honeycomb cross-section that can handle 2 inches of
movement
C) Interlocking steel fingers used for 24 inches of movement
D) A pourable liquid sealant with no backing material
E) A series of steel rods used to tie panels together
Correct Answer: B) rectangle of neoprene with a honeycomb cross section. Can handle
movement of 2 inches
