Open Source Helical Piers Design Guide: Difference between revisions
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*'''2-7/8"''': Steel shaft at 2-7/8" diameter and .217 wall has about 1.8 sq in of area according to [[Area Calculator]]. J55 alloy at 55ksi means that ultimate compressive load with 0 margin of safety (see [[Factor of Safety]]) is about 100k lb. | *'''2-7/8"''': Steel shaft at 2-7/8" diameter and .217 wall has about 1.8 sq in of area according to [[Area Calculator]]. J55 alloy at 55ksi means that ultimate compressive load with 0 margin of safety (see [[Factor of Safety]]) is about 100k lb. | ||
*'''2-3/8"''': Steel shaft at 2-3/8" diameter and .156 wall has about 1.1 sq in of area according to [[Area Calculator]]. J55 alloy at 55ksi means that ultimate compressive load is 60 klb. | *'''2-3/8"''': Steel shaft at 2-3/8" diameter and .156 wall has about 1.1 sq in of area according to [[Area Calculator]]. J55 alloy at 55ksi means that ultimate compressive load is 60 klb. | ||
*Safety factor of | *Safety factor of 4-6 [https://www.engineeringtoolbox.com/factors-safety-fos-d_1624.html] - 10-15 klb allowed load. | ||
=Links= | =Links= | ||
*[[Open Source Helical Piers]] | *[[Open Source Helical Piers]] | ||
Revision as of 17:06, 19 September 2020
Composition
- Connector Fitting and pin
- Flighting
- Shaft
Shaft First Principle Calculations
- 2-7/8": Steel shaft at 2-7/8" diameter and .217 wall has about 1.8 sq in of area according to Area Calculator. J55 alloy at 55ksi means that ultimate compressive load with 0 margin of safety (see Factor of Safety) is about 100k lb.
- 2-3/8": Steel shaft at 2-3/8" diameter and .156 wall has about 1.1 sq in of area according to Area Calculator. J55 alloy at 55ksi means that ultimate compressive load is 60 klb.
- Safety factor of 4-6 [1] - 10-15 klb allowed load.