FSI Technical Manual - page 326

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p 326
APPENDIX 4D
SMARTJACK® SYSTEMS
Chapter 4
Miscellaneous Structural Support Products
Corrosion Protection
The tube steel used for the SmartJack is manufactured with a triple-layer, in-line galvanized coating.
This coating process consists of: (1) a uniform hot-dip zinc galvanizing layer; (2) an intermediate
conversion coating to inhibit the formation of white rust and enhance corrosion resistance; and (3) a
clear organic top coating to further enhance appearance and durability. The inside of the pier tube
also has a zinc-rich coating.
The remaining steel components of the SmartJack; i.e., SJ288TP, SJ100ATR, SJ288TI, and SJ288BP
come standard as electrozinc plated per ASTM B633.
Design Example
Step 1
- Determine the load which will be supported by the girder in pounds per linear foot:
Girder Load (plf) = (Span 1 (ft) + Span 2 (ft)) x Floor Load (psf) ÷ 2
Note 1:
Typical residential wood-framed construction may have an approximate floor load (dead
load + live load) = 55 psf
Note 2:
This equation assumes a floor system which does not support any load bearing walls or
columns.
Step 2
- Determine the load on the SmartJacks by multiplying the calculated Girder Load (plf) by the
spacing of the SmartJacks:
SmartJack Load (lbs) = Girder Load (plf) x SmartJack Spacing (ft)
Step 3
- Verify that the calculated SmartJack load is less than the allowable capacity provided by the
well-compacted crushed stone base and the bearing soils.
Note 3:
Without a detailed soil investigation, typical installations should assume no more than
1,500 psf allowable soil bearing pressure. This would equate to an allowable soil capacity of
6,000 lbs for a 2’x2’ poured concrete footing or a 2’ cube of well-compacted crushed stone.
Extremely soft soils may prohibit the use of a crushed stone base or require that a larger poured
concrete footing be utilized.
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