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construction management 113

Terms in this set (62)

what are two main categories for building loads
gravity and lateral loads
the loads on a floor are generally
lb/ft^2
the loads on a beam are expressed in
lb/ft
the loads on a column are expressed in
lb
which of the following loads can be estimated with greatest certainty
dead loads
floor live loads in residential occupancy is generally
40 psf
Which of the following occupancies has the highest floor live load?
Library Stack Rooms
The roof live load in a building is generally
Less than the floor live load
Roof live load is a function of the building's occupancy. T/F
False
In which of the following roofs will you consider the effect of rain load?
Roof with parapet
Highest wind speeds are usually obtained in
tornadoes
An average tornado strikes a larger area on the ground than a hurricane?
False
The design wind speed is also referred to as the
Basic wind speed
The design wind speed for an average-risk building at a location has a probability of occurrence of
none of the above
The design wind speed for a location is the peak
3-s gust speed
For most of the United States, the design wind speed for an average-risk building is
105 mph
For wind blowing along one of the two major axes of a rectangular building, the windward wall is subjected to positive (toward the wall) pressure
True
For wind blowing along one of the two major axes of a rectangular building, the leeward wall is subjected to positive (toward the wall) pressure
False
For wind blowing along one of the two major axes of a rectangular building, the side walls are subjected to positive (toward the wall) pressure
False
On a leeward wall, the wind pressure
is almost constant with height above the ground
With respect to wind pressure, a building site is classified in terms of
Exposures B, C, and D
The design snow load on a roof is a function of
all of the above (ground snow load of the location, roof slope, wind exposure classification of the site)
According to the geologists, the earth's surface is composed of several segments that are called
Tectonic plates
The region of the United States that is relatively more earthquake prone in the
Western United States
The number of mild (minor to very minor) earthquakes occurring on the earth is almost
several thousand per year
An earthquake measuring 7.0 on the Richter scale is
none of the above
Everything else being the same, a building constructed of heavyweight materials is subjected to a greater earthquake load than a building constructed of lightweight materials
True
QUESTION A reinforced concrete beam measures 12in * 24in in cross section. If the density of reinforced concrete is 150lb/ft^3, the weight of the beam is
300lb/ft (volume * density)
QUESTION In a building whose structural system consists of columns, beams, and floor and roof slabs, the columns are spaced at 40 ft on center in one direction and 25 ft on center in the other direction. What is the tributary area for a interior column?
1,000ft^2 (25*40)
In a building whose structural system consists of columns, beams, and floor and roof slabs, the columns are spaced at 40 ft on center in one direction and 25 ft on center in the other direction. What is the tributary area for a corner column?
250ft^2
The total approximate dead load of a floor in a typical frame residential building is
10 psi
The total approximate gravity load on a floor in a typical wood frame residential building is
50 psf
The material in an arch is primarily in
Compression
When a cable or rope is compressed by a force, what is the compression stress in it?
Zero
In a simple three-member truss consisting of two rafters and a tie, each member is in
either tension or compression
In a suspension bridge, which member(s) is (are) in compression?
Support pylons
A rectangular column measuring 12in * 12in in cross section carries a load of 18 kips. What is the stress in the column?
None of the above (18,000 is correct answer)
The test specimen used for determining the compressive strength of concrete in the US is a
cylinder measuring 6in in diameter * 12in high
When we determine the strength of concrete using the test specimens, we determine the concrete's
ultimate compressive stress
In relation to its compressive strength, the tensile strength of concrete is
much lower
A 20-ft-high column shortens by 0.6in under a load. What is the resulting strain in the column?
0.0025 (change in length/original length)
Which gives greater warning before failure?
A ductile material
In a typical stress-strain diagram of a material, the stress is generally plotted along the vertical axis. T/F
True
What is the yield stress of grade 60 reinforcing steel?
6,000 lb
The stress-strain diagram of mild steel is nearly a straight line up to the yield point. T/F
True
Low-carbon (mild) steel is ____
an elastic-plastic material
Concrete is
an elastic material
Modulus of elasticity refers to how
stiff a material is.
The unit of modulus of elasticity is
All of the above (psi, ksi, Pa, GPa)
The bend stresses along the neutral axis of a beam are
zero
Which of the following beam cross sections is structurally more efficient in bending?
I-Section
Which of the following beam cross sections is structurally more efficient in bending?
Tubular section
The primary purpose of longitudinal steel bars in a reinforced concrete beam is to overcome the weakness of concrete in tension.
True
A material that is weak in tension is
Weak in shear
A material that is weak in tension
weak in bending
The stirrups in a reinforced concrete beam are used to
increase the strength of the beam in shear
The bearing strength of a material is closely related to its
compressive strength
In a steel column that rests on a concrete footing, the area of the bearing plate used is generally
greater than the cross-sectional area of the column
The primary purpose of ties in a reinforced concrete column is to
prevent the buckling of vertical reinforcement in the column
The horizontal blocking in wood studs helps prevent
Buckling
The allowable stress in a material is generally
less than its ultimate stress
In most materials, the safety margin for compressive stress and bending stress is the same. T/F
False
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