Building Construction: Chapter 3 & 4

The loads on a floor are generally expressed in a. lb/ft² b. lb/ft c. lb d. lb/ft^3 e. none of the above

a. lb/ft²

The total approximate dead load of a floor in a typical wood frame residential building is a. 50 psf b. 30 psf c. 10 psf d. 5 psf e. none of the above

c. 10 psf

The loads on a column are generally expressed in a. lb/ft² b. lb/ft c. lb d. lb/ft^3 e. none of the above

c. lb

A 20 ft high column shortens by 0.6 in under a load. What is the resulting strain on the column? a. 0.0020 b. 0.0020 in. c. 0.0025 in. d. 0.0025 e. None of the above

d. 0.0025

Highest wind speeds are usually obtained in a. hurricanes b. wind storms c. thunderstorms d. tornadoes

d. tornadoes

An average tornado strikes a larger area on the ground than a hurricane a. True b. False

b. False

For most of the United States, the design wind speed for an average-risk building is a. 95 mph b. 105 mph c. 115 mph d. 125 mph e. 150 mph

c. 115 mph

The design snow load on a roof is a function of a. ground snow load of the location b. roof slope c. wind exposure classification of the site d. all of the above e. both (a) and (b)

d. all of the above

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 an interior column? a. 1,000 ft² b. 1,000 ft c. 500 ft² d. 250 ft² e. None of the above

a. 1,000 ft²

The floor live load in a residential occupancy is generally assumed to be a. 40 psf b. 10psf c. 20 psf d. 5 psf e. none of the above

a. 40 psf

The total approximate gravity load on a floor in a typical wood frame residential building is a. 50 psf b. 30 psf c. 10 psf d. 5 psf e. none of the above

a. 50 psf

Which of the following loads can be estimated with greatest certainty? a. Dead loads b. Live loads c. Wind loads d. Earthquake loads e. Snow loads

a. Dead loads

In which of the following roofs will you consider the effect of rain load? a. Roof with a parapet b. Roof without a parapet

a. Roof with a parapet

Everything else being the same, a building constructed of heavyweight materials is subjected to a greater earthquake load than building constructed of lightweight materials. a. True b. False

a. True

In a typical stress-strain diagram of a material the stress is generally plotted along the vertical axis. a. True b. False

a. True

The primary purpose of longitudinal steel bars in a reinforced concrete beam is to overcome the weakness of concrete in tension. a. True b. False

a. True

The stress-strain diagram of mild steel is nearly a straight line up to the yield point. a. True b. False

a. True

Concrete is a. an elastic material b. a plastic material c. an elastic-plastic material d. none of the above

a. an elastic material

The material in an arch is primarily in a. compression b. tension c. both tension and compression d. shear e. none of the above

a. compression

In a steel column that rests on a concrete footing the area of the bearing plate used is generally a. greater than the cross-sectional area of the column b. equal to the cross-sectional area of the column c. smaller than the cross-sectional area of the column

a. greater than the cross-sectional area of the column

The roof live load in a building is generally a. less than the floor live load b. greater than than the floor live load c. the same as the floor live load

a. less than the floor live load

The primary purpose of ties in a reinforced concrete column is to a. prevent the buckling of vertical reinforcement in the column b. prevent the crushing of concrete c. increase the shear resistance of the column d. none of the above

a. prevent the buckling of vertical reinforcement in the column

When we determine the strength of concrete using the test specimens we determine the concrete's a. ultimate compressive stress b. ultimate tensile stress c. ultimate shear stress d. modulus of elasticity e. all of the above

a. ultimate compressive stress

Which gives greater warning before failure? a. A brittle material b. A ductile material

b. A ductile material

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 a. True b. False

b. 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. a. True b. False

b. False

In most materials the safety margin for compressive stress and bending stress is the same. a. True b. False

b. False

Roof live load is a function of the building's occupancy a. True b. False

b. False

Which of the following beam cross sections is structurally more efficient in bending? a. Rectangular (Solid) Section b. I-Section

b. I-Section

Which of the following beam cross-sections is structurally more efficient in bending? a. Rectangular (Solid) Section b. Tubular Section

b. Tubular Section

The two main categories under which all building loads may be classified a. dead loads and live loads b. gravity loads and lateral loads c. terrestrial loads and celestial d. first-class and second-class loads

b. gravity loads and lateral loads

The loads on a beam are generally expressed in a. lb/ft² b. lb/ft c. lb d. lb/ft^3 e. none of the above

b. lb/ft

The allowable stress in a material is generally a. equal to its ultimate stress b. less than its ultimate stress c. greater than its ultimate stress d. none of the above

b. less than its ultimate stress

Modulus of elasticity refers to how a. strong a material is b. stiff a material is c. elastic a material is d. serviceable material is e. none of the above

b. stiff a material is

A material that is weak in tension is a. strong in bending b. weak in bending c. no relationship between the tensile and bending strengths of a material

b. weak in bending

A material that is weak in tension is a. strong in shear b. weak in shear c. no relationship between the tensile and bending strengths of a material

b. weak in shear

A reinforced concrete beam measures 12 in. x 24 in. in cross section. if the density of reinforced concrete is 150 lb/ft^3, the weight of beam is a. 450 lb/ft b. 350 lb/ft c. 300 lb/ft d. 300 lb e. 300 lb/ft^3

c. 300 lb/ft

Which of the following occupancies has the highest floor live load? a. Classrooms b. Hotel guest rooms c. Library stack rooms d. Library reading rooms e. Offices

c. Library stack rooms

In a suspension bridge, which members(s) is (are) in compression? a. Suspension cable b. Hanger cables c. Support pylons d. Both suspension cable and hanger cables e. None of the above

c. Support pylons

When a cable or rope is compressed by a force what is the compressive stress in it? a. Equal to the force applied b. Force divided by the cross-sectional area of rope c. Zero d. Infinite e. None of the above

c. Zero

Low-carbon (mild) steel is a. an elastic material b. a plastic material c. an elastic-plastic material d. none of the above

c. an elastic-plastic material

The bearing strength of a material is closely related to its a. bending strength b. tensile strength c. compressive strength d. modulus of elasticity e. none of the above

c. compressive strength

In a simple three-member truss consisting of two rafters and a tie, each member is in a. compression b. tension c. either tension or compression d. shear e. both tension and compression

c. either tension or compression

On a leeward wall, the wind pressure a. increases with height above the ground b. decrease with height above the ground c. is almost constant with the height above the ground

c. is almost constant with the height above the ground

According to the geologists, the earths surface is composed of several segments that are called a. earth segments b. surface plates c. tectonic plates d. geological segments e. segmental plates

c. tectonic plates

The bending stresses along the neutral axis of a beam are a. minimum b. maximum c. zero d. none of the above

c. zero

In a building whose structural system consists of columns, beams, and floor and roof slabs, the columns are spaced at 40ft on center in one direction and 25ft on center in the other direction. What is the tributary area for a corner column? a. 1,000 ft² b. 1,000 ft c. 500 ft² d. 250 ft² e. None of the above

d. 250 ft²

The design wind speed for a location is the peak a. 60-s gust speed b. 10-s gust speed c. 5-s gust speed d. 3-s gust speed e. 1-s gust speed

d. 3-s gust speed

A rectangular column measuring 12 in. x 12 in. in cross section carries a load of 18 kips. What is the stress in the column? a. 18 kips b. 18 ksi c. 2.25 ksi d. None of the above e. 125 psi

d. None of the above

The horizontal blocking in wood studs helps prevent a. compressive failure of studs b. shear failure of studs c. tensile failure of studs d. buckling of studs

d. buckling of studs

The stirrups in a reinforced concrete beam are used to a. increase the strength of the beam in bending b. reduce the deflection of the beam c. increase the durability of the beam d. increase the strength of the beam in shear e. none of the above

d. increase the strength of the beam in shear

In relation to its compressive strength the tensile strength of concrete is a. much higher b. slightly higher c. nearly the same d. much lower e. slightly lower. nearly the same

d. much lower

The region of the United States that is relatively more earthquake prone is the a. northern United States b. southern United States c. eastern United States d. western United States e. none of the above

d. western United States

With respect to wind pressure, a building site is classified in terms of a. Exposures A, B, C, and D b. Exposures A, B, and C c. Exposures X, Y, and Z d. Exposures P, Q, R, and S e. Exposures B, C, and D

e. Exposures B, C, and D

What is the yield stress of grade 60 reinforcing steel? a. 60 lb b. 6,000 lb c. 6,000 psi d. 60 psi e. None of the above

e. None of the above

The unit of modulus of elasticity is a. psi b. ksi c. Pa. d. GPa e. all the above

e. all the above

The design wind speed is also referred to as the a. standard wind speed b. official wind speed c. uniform wind speed d. straight-line wind speed e. basic wind speed

e. basic wind speed

The test specimen used for determining the compressive strength of concrete in the United States is a a. cube measuring 12 in. x 12 in. x 12 in. b. cube measuring 6 in. x 6 in. x 6 in. c. prism measuring 6 in. x 6 in. x 12 in. d. cylinder measuring 12 in. in diameter x 6 in. high e. cylinder measuring 6 in. in diameter x 12 in. high

e. cylinder measuring 6 in. in diameter x 12 in. high

An earthquake measuring 7.0 on the Richter scale is a. twice as strong as a 6.0 earthquake b. 10 times stronger than a 6.0 earthquake c. 100 times stronger than a 6.0 earthquake d. 500 times stronger than a 6.0 earthquake e. none of the above

e. none of the above

The design wind speed for an average-risk building at a location has a probability of occurrence of a. once in 300 years b. once in 200 years c. once in 100 years d. once in 50 years e. none of the above

e. none of the above

The number of mild (minor to very minor) earthquakes occurring on the earth is almost a. 1 or 2 per year b. 10 to 20 per year c. 100 per year d. 1,000 per year e. several thousand per year

e. several thousand per year

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. a. True b. False

a. True