Question 1

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.

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Question 2

Explain what load factor is in structural design.

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Question 3

What are the units of stress in the U.S. system of units and the SI system of units?

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Question 4

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.

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Question 5

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

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Question 6

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

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Question 7

Explain what resistance factor is in structural design.

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Question 8

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

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(a)elasticity and modulus of...

Question 9

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.

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Question 10

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.

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Question 11

Explain with the help of a sketch why a brittle material is weak in shear.

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Question 12

Using sketches and notes, explain how we increase the bending efficiency of building components.

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Question 13

Explain the modulus of elasticity. Which property of the material does it represent? Give the approximate values of the modulus of elasticity of steel, concrete, and wood.

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Question 14

Explain the concept of buckling. Explain whether buckling would occur if a member is subjected to bending. What measures do we adopt to prevent the buckling failure of building components?

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Quiz 4: Load Resistance the Structural Properties of Materials