Question 1

In the stress- strain diagrams of materials, which axis (X- axis or Y- axis)is typically used for stress and which for strain?

Accepted Answer

X- axis fo

Question 2

Explain two methods by which the buckling of a member may be prevented.

Accepted Answer

Because buckling is related to the slend

Question 3

What is the neutral axis of a structural member and in which situation do we refer to it-when the member is in axial compression, axial tension or bending?

Accepted Answer

The neutral axis is a plane in

Question 4

Among the commonly used structural materials (steel, concrete, masonry and wood), which has the highest modulus of elasticity and which has the lowest modulus elasticity?

Accepted Answer

Steel has the highes

Question 5

Explain why shear strength of brittle materials is low.

Accepted Answer

Shear stress creates tension along one d

Question 6

Which gives greater warning before failure?

Accepted Answer

A) A brittle material 
B) A ductile material 
A) A brittle material 
B) A ductile material

Question 7

What is the difference between bearing strength and compressive strength?

Accepted Answer

Both, bearing strength and compressive s

Question 8

Sketch the stress- strain diagram of low- carbon (mild)steel, showing all of its important parts, and explain why steel should not be stressed beyond its yield stress.

Accepted Answer

The stress-strain diagram of low-carbon

Question 9

Which of the following beam cross sections is structurally more efficient in bending?

Accepted Answer

A) I- section 
B) Rectangular (solid)section 
A) I- section 
B) Rectangular (solid)section

Question 10

What is meant by a "structurally efficient" cross- sectional shape in bending? Note: "in bending" means that the member is used as beam or slab.

Accepted Answer

A member with a structurally e

Question 11

A l- in.- diameter steel bar is subjected to a tensile force of 30 kips. Determine the stress in the bar.

Accepted Answer

To determine the stress in the bar, we c

Question 12

The material in an arch is primarily in

Accepted Answer

A) tension. 
B) compression. 
C) both tension and compression. 
D) shear. 
E) none of the above. 
A) tension. 
B) compression. 
C) both tension and compression. 
D) shear. 
E) none of the above.

Question 13

Explain what yielding of a material means.

Accepted Answer

Yielding is a state of deformation in a

Question 14

The primary purpose of ties in a reinforced concrete column is to

Accepted Answer

A) prevent the buckling of vertical reinforcement in the column. 
B) increase the shear resistance of the column. 
C) prevent the crushing of concrete. 
D) none of the above. 
A) prevent the buckling of vertical reinforcement in the column. 
B) increase the shear resistance of the column. 
C) prevent the crushing of concrete. 
D) none of the above.

Question 15

When a member buckles, it bends. Explain the difference between buckling and bending.

Accepted Answer

Bending deformation occurs when the load

Question 16

A rectangular column measuring 12 in. × 12 in. in cross section carries a load of 18 kips. What is the stress in the column?

Accepted Answer

A) 125 psi 
B) 18 kips 
C) 18 ksi 
D) 2.25 ksi 
E) None of the above 
A) 125 psi 
B) 18 kips 
C) 18 ksi 
D) 2.25 ksi 
E) None of the above

Question 17

A concrete column 20 ft high shortens to 19 ft 11- 1/2 in. under a load. Determine the strain in the column.

Accepted Answer

Strain, s = [(change in length

Question 18

A concrete cylinder specimen is tested by loading it in compression from its top. The cylinder is restrained from expanding laterally (not allowed to bulge horizontally under the load). A second identical cylinder is tested in compression similarly but without any lateral restraint, i.e., this cylinder is allowed to bulge laterally. Will both cylinders fail at the same or a different value of load? Explain your answer.

Accepted Answer

The first cylinder, restrained from late

Question 19

Modulus of elasticity refers to how

Accepted Answer

A) elastic a material is. 
B) stiff a material is. 
C) strong a material is. 
D) serviceable a material is. 
E) none of the above. 
A) elastic a material is. 
B) stiff a material is. 
C) strong a material is. 
D) serviceable a material is. 
E) none of the above.

Question 20

Concrete is

Accepted Answer

A) an elastic- plastic material. 
B) an elastic material. 
C) a plastic material. 
D) none of the above. 
A) an elastic- plastic material. 
B) an elastic material. 
C) a plastic material. 
D) none of the above.

Exam 4: Load Resistance the Structural Properties of Materials

In the stress- strain diagrams of materials, which axis (X- axis or Y- axis)is typically used for stress and which for strain?

Explain two methods by which the buckling of a member may be prevented.

What is the neutral axis of a structural member and in which situation do we refer to it-when the member is in axial compression, axial tension or bending?

Among the commonly used structural materials (steel, concrete, masonry and wood), which has the highest modulus of elasticity and which has the lowest modulus elasticity?

Explain why shear strength of brittle materials is low.

Which gives greater warning before failure?

What is the difference between bearing strength and compressive strength?

Sketch the stress- strain diagram of low- carbon (mild)steel, showing all of its important parts, and explain why steel should not be stressed beyond its yield stress.

Which of the following beam cross sections is structurally more efficient in bending?

What is meant by a "structurally efficient" cross- sectional shape in bending? Note: "in bending" means that the member is used as beam or slab.

A l- in.- diameter steel bar is subjected to a tensile force of 30 kips. Determine the stress in the bar.

The material in an arch is primarily in

Explain what yielding of a material means.

The primary purpose of ties in a reinforced concrete column is to

When a member buckles, it bends. Explain the difference between buckling and bending.

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 concrete column 20 ft high shortens to 19 ft 11- 1/2 in. under a load. Determine the strain in the column.

Modulus of elasticity refers to how

Concrete is

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