Practice Importance In Earthquake Engineering (5.1.3) - Degrees of Freedom and SDOF

Practice: Importance in Earthquake Engineering

Lesson 5.1.3Degrees of Freedom and SDOF

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6 sample questions

Question 1.
What does DOF stand for?
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Think about how many independent movements a structure can have.
Question 2.
What does the natural frequency determine in a structure?
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Consider how vibrations can impact the structure.
3Question 3.
What do Degrees of Freedom (DOF) refer to?
- The number of possible structural movements
- The number of floors in a building
- The total mass of a structure
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Think about how a structure can move.
4Question 4.
True or False: Increasing the number of DOF simplifies the structural analysis.
- True
- False
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Consider how much more effort it takes with more movements.
Question 5.
A multi-story building has been modeled with 12 DOFs. If during a seismic analysis it was found that the first two modes account for 80% of the response, is it reasonable to consider it a single-degree-of-freedom system for certain analyses? Justify your answer.
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Consider the concept of mass participation in SDOF.
Question 6.
Explain the impact of ignoring rotational degrees of freedom in an asymmetric structure during seismic analysis.
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Think about how torsion complements translation in buildings.

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