| 1. |
As stated in the SK315 Hammerhead Tower Crane Operating Manual, the maximum permissible in-service wind speed that the SK315 cranes were designed to bear is ___________? |
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45 mph |
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55 mph |
| 2. |
According to Figure 18, the circulation in the wake region is described as?
 |
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Laminar |
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Turbulent |
| 3. |
The full form of CFD |
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Computational Failure Dynamics |
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Computational Fluid Dynamics |
| 4. |
From the summary of observations, which of the following is false?
- Prior to the storm, the cranes were not lowered by two tower sections
- Allsectionsofthejibs remainedconnectedafterthe collapses.
- The maximum height of the tower cranes above the uppermost tie-in was less than the maximum allowable free-standing height of the cranes.
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Only 1 |
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1 and 2 |
| 5. |
Under actual wind loads section, wind data obtained from the National Weather Service was recorded at five locations
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True |
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False |
| 6. |
The A-frame of the crane involved in the third failure was found deformed: the right hand post bent at about the mid-height. |
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True |
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False |
| 7. |
Based on mode analysis of jib, a mode with a large, effective mass is usually a significant contributor to the response of the system to _________________ excitation. |
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Dynamic |
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Static |
| 8. |
According Table 4, a Mode number of 22 is seen under which direction?
| |
TransversDirection |
VerticalDirection |
| |
Mode
No. |
Frequency
(Hz) |
Participation
Factor (%) |
Mode
No. |
Frequency
(Hz) |
Participation
Factor (%) |
| 1st failure |
9 |
3.819 |
53 |
4 |
1.354 |
81 |
| 1 |
0.466 |
14 |
10 |
4.349 |
6 |
| 22 |
12.083 |
10 |
7 |
3.033 |
2 |
| 2st failure |
8 |
3.906 |
52 |
4 |
1.423 |
82 |
| 1 |
0.67 |
13 |
10 |
4.516 |
6 |
| 22 |
14.329 |
10 |
15 |
8.956 |
2 |
| 3st failure |
6 |
4.051 |
52 |
4 |
1.462 |
82 |
| 1 |
0.759 |
11 |
8 |
4.39 |
6 |
| 22 |
14.341 |
11 |
17 |
10.466 |
3 |
|
|
|
Vertical |
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Transverse |
| 9. |
What does TVS stands for? |
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Tornadic Vortex Signature |
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Tornadic Velocity Signature |
| 10. |
According to figure 8, how many high rise buildings are existing?
 |
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3 |
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2 |
| 11. |
The equation of motion of the rotating part of the crane is given as?
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Iθ+μš¹šššš”šššθ=Tš¤ššš(x,y,z) |
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Iθ+μš¹šššš”šššθ=Tš¤ššš(t) |
| 12. |
It is concluded that the design of the crane, model SK-315 generally met the U.S. and ____________ standards. |
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Australian |
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European |
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