Question 1

Explain the difference between:
(a)elasticity and modulus of elasticity of a material.
(b)brittleness and ductility of materials.

Accepted Answer

(a) Elasticity refers to the ability of

Question 2

The bending stresses along the neutral axis of a beam are

Accepted Answer

A) zero. 
B) maximum. 
C) minimum. 
D) none of the above. 
A) zero. 
B) maximum. 
C) minimum. 
D) none of the above.

Question 3

Explain the difference between an elastic material and a plastic material.

Accepted Answer

An elastic material returns to

Question 4

What is the modulus of elasticity of a material whose stress- strain relationship is a vertical straight line? Name the material with such a stress- strain relationship.

Accepted Answer

The modulus of elasticity of s

Question 5

If the ultimate strength of a material is 6,000 psi and the factor of safety is 2.5, determine the allowable stress of the material.

Accepted Answer

The allowable stress of a material is th

Question 6

Why is an I- section beam structurally more efficient than a beam of rectangular cross section whose cross- sectional area is the same as that of an I- section beam?

Accepted Answer

An I- section beam is structurally more

Question 7

Does the slope of the stress- strain diagram relate to any property of the material? Explain.

Accepted Answer

The slope of the stress- strai

Question 8

In most materials, the safety margin for compressive stress and bending stress is the same.

Accepted Answer

A) True 
 B)False

Question 9

What is the unit of measure for modulus of elasticity in U.S. System of units? In SI System of units?

Accepted Answer

Pounds per sq in. (psi)or kips

Question 10

What is the yield stress of grade 60 reinforcing steel?

Accepted Answer

A) 60 psi 
B) 60 lb 
C) 6,000 lb 
D) 6,000 psi 
E) None of the above 
A) 60 psi 
B) 60 lb 
C) 6,000 lb 
D) 6,000 psi 
E) None of the above

Question 11

Low- carbon (mild)steel is

Accepted Answer

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

Question 12

Explain with the help of a three- dimensional sketch the reason for bending inefficiency, that is, why the strength of a material in a component is not fully utilized when the component is subjected to bending.

Accepted Answer

When a material is subjected to bending,

Question 13

When we determine the strength of concrete using the test specimens, we determine the concrete's

Accepted Answer

A) ultimate compressive stress. 
B) modulus of elasticity. 
C) ultimate tensile stress. 
D) ultimate shear stress. 
E) all of the above. 
A) ultimate compressive stress. 
B) modulus of elasticity. 
C) ultimate tensile stress. 
D) ultimate shear stress. 
E) all of the above.

Question 14

The bearing strength of a material is closely related to its

Accepted Answer

A) bending strength. 
B) compressive strength. 
C) tensile strength. 
D) modulus of elasticity. 
E) none of the above. 
A) bending strength. 
B) compressive strength. 
C) tensile strength. 
D) modulus of elasticity. 
E) none of the above.

Question 15

The allowable stress in a material is generally

Accepted Answer

A) less than its ultimate stress. 
B) equal to its ultimate stress. 
C) greater than its ultimate stress. 
D) none of the above. 
A) less than its ultimate stress. 
B) equal to its ultimate stress. 
C) greater than its ultimate stress. 
D) none of the above.

Question 16

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

Accepted Answer

A) True 
 B)False

Question 17

Explain what resistance factor is in structural design.

Accepted Answer

Resistance factor is the second safety f

Question 18

List the following materials (aluminum, concrete, steel, and wood)in terms of their ductility beginning with the most ductile and ending with the least ductile.

Accepted Answer

Steel
Alum

Question 19

Explain what is bearing strength of a material and how it differs from the material's compressive strength.

Accepted Answer

Bearing strength of a material refers to

Question 20

If the bar in Problem 2 is 10 ft long, determine the elongation in the bar. The modulus of elasticity of steel is 29 ×106 psi.

Accepted Answer

To determine the elongation of a bar, we

Exam 4: Load Resistance the Structural Properties of Materials

Explain the difference between: (a)elasticity and modulus of elasticity of a material. (b)brittleness and ductility of materials.

The bending stresses along the neutral axis of a beam are

Explain the difference between an elastic material and a plastic material.

What is the modulus of elasticity of a material whose stress- strain relationship is a vertical straight line? Name the material with such a stress- strain relationship.

If the ultimate strength of a material is 6,000 psi and the factor of safety is 2.5, determine the allowable stress of the material.

Why is an I- section beam structurally more efficient than a beam of rectangular cross section whose cross- sectional area is the same as that of an I- section beam?

Does the slope of the stress- strain diagram relate to any property of the material? Explain.

In most materials, the safety margin for compressive stress and bending stress is the same.

What is the unit of measure for modulus of elasticity in U.S. System of units? In SI System of units?

What is the yield stress of grade 60 reinforcing steel?

Low- carbon (mild)steel is

Explain with the help of a three- dimensional sketch the reason for bending inefficiency, that is, why the strength of a material in a component is not fully utilized when the component is subjected to bending.

When we determine the strength of concrete using the test specimens, we determine the concrete's

The bearing strength of a material is closely related to its

The allowable stress in a material is generally

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

Explain what resistance factor is in structural design.

List the following materials (aluminum, concrete, steel, and wood)in terms of their ductility beginning with the most ductile and ending with the least ductile.

Explain what is bearing strength of a material and how it differs from the material's compressive strength.

If the bar in Problem 2 is 10 ft long, determine the elongation in the bar. The modulus of elasticity of steel is 29 ×106 psi.

An Overview of the Building Delivery Process How Buildings Come Into Being

Design and Constructions Regulations

Loads on Buildings

Properties of the Envelope-I Thermal Properties

Properties of the Envelope-II Air and Water Vapor Control

Fire and Smoke-Related Properties

Acoustical Properties of Materials

Principles of Joints and Sealants Expansion and Contraction Control

Principles of Sustainable Construction

Soils and Excavations

Below-Grade Construction Foundation Systems and Basements

Materials for Wood Construction-I Lumber

Materials for Wood Construction-Ii Engineered Wood Products, Fasteners, and Connectors

Wood Light-Frame Construction-I

Wood Light-Frame Construction-II

Structural Insulated Panel Construction

Material Steel and Steel Components

Structural Steel Construction

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Concrete Construction-I Formwork, Reinforcement, and Slabs-On-Ground

Concrete Construction-II Site-Cast and Precast Concrete Framing Systems

Masonry Materials-I Mortar and Brick

Masonry Materials-II Concrete Masonry Units, Natural Stone, and Glass Masonry Units

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Exterior Wall Cladding-I Principles of Rainwater Infiltration Control

Exterior Wall Cladding-II Masonry, Precast Concrete, and Gfrc

Exterior Wall Cladding-III Stucco, Adhered Veneer, Eifs, Natural Stone, and Insulated Metal Panels

Glass, Glazing, and Light-Transmitting Plastics

Windows and Doors

Exterior Wall Cladding-Iv Wall System in Glass

Roofing-I Low-Slope Roofs

Roofing-I Steep Roofs

Stairs

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If the bar in Problem 2 is 10 ft long, determine the elongation in the bar. The modulus of elasticity of steel is 29 ×10⁶ psi.