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Seismic Design Essentials
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1
Question
How many levels of intensity are associated with the Modified Mercalli Intensity scale?
Page 2
Answer
12
2
Question
What is the definition of the term attenuation in seismology?
Page 2
Answer
A decrease in seismic energy
3
Question
Which factor does not influence attenuation of seismic waves?
Page 2
Answer
Earthquake magnitude
4
Question
Which site is most likely to amplify ground motion?
Page 3
Answer
Soft clay site
5
Question
What is the approximate peak ground acceleration in the vicinity of epicenters of major California earthquakes?
Page 3
Answer
0.25 g
6
Question
Spectral velocity is best described as?
Page 3
Answer
The velocity of a secondary wave
7
Question
For a single-degree-of-freedom system, the natural period T is?
Page 3
Answer
The inverse of the natural frequency
8
Question
What is spectral acceleration of a single-degree-of-freedom system?
Page 3
Answer
The maximum acceleration experienced by the system in response to a perturbation
9
Question
How is stiffness best described for a harmonic oscillator?
Page 3
Answer
The force acting on the ideal linear spring per unit deflection
10
Question
When does the natural building period coincide with the earthquake period?
Page 3
Answer
When the acceleration is at its maximum
11
Question
The period of a structure is correlated with which?
Page 3
Answer
Mass and stiffness of the structure
12
Question
What is the maximum considered (capable) earthquake motion at a site?
Page 3
Answer
The motion at the site with a 10% probability of being exceeded in a 100-year time period
13
Question
In the relationship between stiffness K, natural period T, and deflection Δ for a SDOF system, which best describes?
Page 3
Answer
K ∝ 1/T²
14
Question
For two ideal springs K1 and K2 in parallel supporting a mass, what is the total spring constant?
Page 3
Answer
K1 + K2
15
Question
When installing permanent heavy air-conditioning equipment on top of a building, how does it affect the building period?
Page 2
Answer
It will increase the period
16
Question
With which of the following is an increase in earthquake magnitude correlated?
Page 2
Answer
An increase in acceleration
17
Question
Which earthquake characteristics influence the structural damage?
Page 2
Answer
All of the above (frequency, ground acceleration, duration)
18
Question
Liquefaction is best described as?
Page 2
Answer
A sudden drop in the shear strength of a soil
19
Question
When liquefaction occurs, which soil conditions are likely?
Page 2
Answer
The soils are made of saturated, cohesionless particles
20
Question
Which of the following structural damage characteristics are influenced by an earthquake?
Page 2
Answer
Peak ground acceleration and duration of motion
21
Question
Which periods share the same definition?
Page 2
Answer
The period of an earthquake and the period of a site
22
Question
Which of the following influence the amount of structural damage caused by an earthquake?
Page 2
Answer
All of the above (soil condition at site, period of site, peak acceleration, duration, epicenter distance, natural period and damping of structure)
23
Question
Resonance occurs when?
Page 2
Answer
The natural period of the structure matches the period of the exciting force
24
Question
The total seismic dead load should include?
Page 6
Answer
All of the above (anything suspended from roof, permanent equipment on upper half walls, permanent equipment on roof)
25
Question
When designing a storage warehouse, what percent of live load must be included in total seismic weight?
Page 6
Answer
25%
26
Question
For a proposed building in seismic zone 4 with all hard rock-like material and elastic fundamental period of vibration 0.6 sec, what is the corresponding value of spectral acceleration?
Page 6
Answer
0.32
27
Question
The NSCP formula for determining the fundamental period T of a building represents?
Page 6
Answer
The dynamic period
28
Question
For moment-resisting structural system, resistance to lateral load is provided by?
Page 6
Answer
Moment-resisting frames
29
Question
The value of hn for structures with penthouse is?
Page 6
Answer
Larger for the structure with penthouse
30
Question
In determining base shear for a building with natural period T1=0.6 sec, what additional force Ft to the roof?
Page 6
Answer
Ft = 0.07 TV