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SJI Verification

 SJI Joist Selection Verification Tests

In order to validate the SJI module developed verification tests were undertaken. K series, LH series and DLH series were all tested on both functionalities pick and check.

The pick functionality determines a valid joist designation and calculates the utility ratio based on specified load and dimensional conditions. The search algorithm selects a valid joist whilst minimising the mass per foot.

The check functionality calculates the utility of a proposed joist designation based on specified load and dimensional conditions.

Direct testing of the pick functionality was far more comprehensive than direct testing of the check functionality. This is justified as the check functionality is completed after a valid joist is selected to return the utility ratio. The check functionality is therefore implicitly tested during the pick function tests.

The term No Solution means a valid joist could not be found based on the design criteria given (load, depth, etc…)

K Series Tests

Test No. Functionality
Tested
Max
Depth (in)
Span
(ft)
Provision
Factored
Load
(lb/ft)
SJI Table Result SkyCiv Result SkyCiv
Utility Ratio
1 Pick 40 31.848 LRFD Factored 600 28K6 28K6 0.897
2 Pick 18 31.848 LRFD Factored 600 18K10 18K10 0.897
3 Pick 40 21.5 ASD Factored 550 20K4 20K4 1
4 Pick 40 21.5 LRFD Factored 550 18K3 18K3 0.96
5 Pick 30 31.5 ASD Unfactored 550 No Result No Solution No Solution
6 Check 18 31.848 LRFD Factored 600 0.897 18K10 0.897

LH Series Tests

Test No. Functionality
Tested
Max Depth
(in)
Span
(ft)
Provision Factor Load
(lb/ft)
SJI Table Result SkyCiv Result SkyCiv
Utility Ratio
1 Pick 40 23 ASD Unfactored 1000 20LH08 20LH08 0.97
2 Pick 19 23 ASD Unfactored 1000 18LH09 18LH09 0.946
3 Pick 40 23 LRFD Unfactored 2000 No Result No Solution No Solution
4 Pick 40 31.484 ASD Unfactored 600 24LH06 24LH06 0.906
5 Check 31.484 LRFD Unfactored 1650 0.998 28LH06 0.998
6 Pick 22 50 ASD Factored 1000 No Result No Solution No Solution
7 Pick 22 15.24 m ASD Unfactored 14.594 kN/m  24LH06 24LH06 0.906
8 Pick 40 31.484 ASD Unfactored 600 24LH06 24LH06 0.906

DLH Series Tests

Test No. Functionality
Tested
Max
Depth (in)
Span
(ft)
Provision
Factored
Load
(lb/ft)
SJI Table Result SkyCiv Result SkyCiv
Utility Ratio
1 Pick 160 120 LRFD Unfactored 1000 88DLH19 88DLH19 0.908
2 Pick 160 120 LRFD Factored 1000 96DLH19 96DLH19 0.876
3 Pick 160 120 ASD Factored 1000 96DLH21 96DLH21 0.93
4 Pick 160 23 ASD Unfactored 2000 No Result No Solution No Solution
5 Pick 160 23 LRFD Unfactored 2000 88DLH21 88DLH21 0.896
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