Building Construction: Principles, Materials & Systems Ch.4

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.

d. much lower.

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 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

In most materials, the safety margin for compressive stress and bending stress is the same. 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 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 a 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 shear and tensile strengths of a material.

b. weak in shear.

In a suspension bridge, which member(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.

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

c. zero.

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

d. 0.0025

A rectangular column measuring 12 in. * 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. 125 psi e. None of the above

d. 125 psi

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.

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 units of modulus of elasticity are a. psi. b. ksi. c. Pa. d. GPa. e. all of the above.

e. all of the above.

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

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