DESIGN OF REINFORCED CONCRETE
STRUCTURES QUESTIONS &
SOLUTIONS(RATED A+)
Its compressive strength is significantly stronger - ANSWERWhich of the following
about fiber-reinforced concrete is not true when comparing it to concrete without fibers?
High Ductility - ANSWERWhich of the following is NOT a characteristic of High Strength
Concrete?
The common all-purpose cement used for general construction work - ANSWERWhich
of the following describes Type I cement?
Beam A - ANSWERWhich beam has a LARGER area moment of inertia about the C-C
axis shown?
The minimum clear distance between the reinforcement bars might require a wider web
or an additional layer of reinforcement
The steel might not yield and the beam could fail in a brittle manner - ANSWERBy
increasing the amount of steel reinforcement ...
24 in^2 - ANSWERThe modulus of the steel reinforcements used in a reinforced
concrete beam is E s = 29,000 ksi and the modulus of the concrete is E c = 3625 ksi.
What is the transformed area if 3 #9 bars are used in the beam?
Stresses can be computed from strains - ANSWERWhich of the following is one of the 3
basic flexural assumptions of reinforced concrete members?
At the neutral axis
At an extreme fiber - ANSWERAt what location(s) is either the normal stress or the
shear stress zero in a RC beam under flexure?
Supported on four sides when L >= 2S
Supported on two opposite sides - ANSWERIn which cases is a slab considered a one-
way slab? Select all that apply.
Tension controlled - ANSWERWhich type of bending failure is best desired in the
design of a RC beam?
Increases the amount of curvature before flexural failure
Reduces the long-term deflection - ANSWERAdding reinforcement in the compression
zone of a bending RC beam
, Member failure will occur unless cracked concrete section can resist the forces -
ANSWERAfter a crack has developed ...
L/360 - ANSWERFloors not supporting or attached to non-structural elements likely to
be damaged by large deflections have a deflection limitation of:
Requires more development length - ANSWERIn comparison with normal reinforced
bars, reinforcement that has been coated with an epoxy ...
Friction
Chemical Adhesion
Ribbed Deformations on the bars - ANSWERWhich of the following is a reason that
steel and concrete bond?
High; small - ANSWERShear failures are most likely to occur in members subjected to
______ shear force and _______ bending moments:
Prevent large shear crack opening
Improve shear transfer by aggregate interlock
Prevent longitudinal bars from spalling concrete - ANSWERWhich is/are the benefit(s)
of web reinforcing?
The moment resistance may be increased or decreased as the axial load increases -
ANSWERThe relationship between the axial load on a column and the moment that the
column can resist is as follows:
Allows the strain at one face to be assumed and at the other locations to be computed -
ANSWERStrain linearity in short columns ...
The dimensions of the cross section of the column
Strength of the materials used
The eccentricity of the load - ANSWERThe load that a short column may support is
controlled by, _____?
One-way and two-way shear - ANSWERWhen designing a square isolated footing,
which shear must be considered?
Shear forces, moments, and deflections - ANSWERLoad placed in one span of a
continuous RC structure affects ______ in other spans.
Redistribution in the moment pattern
Increased resisting moment after the member is stressed to its yield point -
ANSWERPlastic design involves two components ...
Modulus of rupture test
Split cylinder test - ANSWERTensile strength is measured indirectly by
STRUCTURES QUESTIONS &
SOLUTIONS(RATED A+)
Its compressive strength is significantly stronger - ANSWERWhich of the following
about fiber-reinforced concrete is not true when comparing it to concrete without fibers?
High Ductility - ANSWERWhich of the following is NOT a characteristic of High Strength
Concrete?
The common all-purpose cement used for general construction work - ANSWERWhich
of the following describes Type I cement?
Beam A - ANSWERWhich beam has a LARGER area moment of inertia about the C-C
axis shown?
The minimum clear distance between the reinforcement bars might require a wider web
or an additional layer of reinforcement
The steel might not yield and the beam could fail in a brittle manner - ANSWERBy
increasing the amount of steel reinforcement ...
24 in^2 - ANSWERThe modulus of the steel reinforcements used in a reinforced
concrete beam is E s = 29,000 ksi and the modulus of the concrete is E c = 3625 ksi.
What is the transformed area if 3 #9 bars are used in the beam?
Stresses can be computed from strains - ANSWERWhich of the following is one of the 3
basic flexural assumptions of reinforced concrete members?
At the neutral axis
At an extreme fiber - ANSWERAt what location(s) is either the normal stress or the
shear stress zero in a RC beam under flexure?
Supported on four sides when L >= 2S
Supported on two opposite sides - ANSWERIn which cases is a slab considered a one-
way slab? Select all that apply.
Tension controlled - ANSWERWhich type of bending failure is best desired in the
design of a RC beam?
Increases the amount of curvature before flexural failure
Reduces the long-term deflection - ANSWERAdding reinforcement in the compression
zone of a bending RC beam
, Member failure will occur unless cracked concrete section can resist the forces -
ANSWERAfter a crack has developed ...
L/360 - ANSWERFloors not supporting or attached to non-structural elements likely to
be damaged by large deflections have a deflection limitation of:
Requires more development length - ANSWERIn comparison with normal reinforced
bars, reinforcement that has been coated with an epoxy ...
Friction
Chemical Adhesion
Ribbed Deformations on the bars - ANSWERWhich of the following is a reason that
steel and concrete bond?
High; small - ANSWERShear failures are most likely to occur in members subjected to
______ shear force and _______ bending moments:
Prevent large shear crack opening
Improve shear transfer by aggregate interlock
Prevent longitudinal bars from spalling concrete - ANSWERWhich is/are the benefit(s)
of web reinforcing?
The moment resistance may be increased or decreased as the axial load increases -
ANSWERThe relationship between the axial load on a column and the moment that the
column can resist is as follows:
Allows the strain at one face to be assumed and at the other locations to be computed -
ANSWERStrain linearity in short columns ...
The dimensions of the cross section of the column
Strength of the materials used
The eccentricity of the load - ANSWERThe load that a short column may support is
controlled by, _____?
One-way and two-way shear - ANSWERWhen designing a square isolated footing,
which shear must be considered?
Shear forces, moments, and deflections - ANSWERLoad placed in one span of a
continuous RC structure affects ______ in other spans.
Redistribution in the moment pattern
Increased resisting moment after the member is stressed to its yield point -
ANSWERPlastic design involves two components ...
Modulus of rupture test
Split cylinder test - ANSWERTensile strength is measured indirectly by
