NCEES Civil PE Specification Means and Methods: Construction loads
Problem
A spreader beam is used to lift a precast concrete beam with an unfactored dead load of 70 kip. Based on the following wire breaking strengths, choose the minimum wire diameter required to safely lift the beam.
- Consider a factor of safety of 2.0
- Ignore self-weight of spreader beam and wires
|
Wire |
5/8" |
Breaking strength |
= |
33 |
kip |
|
Wire |
¾" |
Breaking strength |
= |
47 |
kip |
|
Wire |
1" |
Breaking strength |
= |
83 |
kip |
|
Wire |
1 ¼" |
Breaking strength |
= |
130 |
kip |
Select an Answer:
