AS 1597 Specification Support
- Lucas Beattie
User can now select AS 1597 as their specification in Project Settings. When AS1597 is selected:
Load and resistance factors are set to spec defaults.
Fatigue and service allowable bar stresses are set to AS5100.5 option.
Minimum reinforcement is set to 150mm^2/m.
Minimum percent of flexure is set to 15.
Minimum reinforcement ratio is set to 0.002.
User can now select "By Specification" as an option in the "Moving Loads" dialogue box to generate the DLA automatically per spec.
Minimum DLA is generated like so:
If the vehicle name begins or ends with "S1600" then the minimum DLA is set to 0.
Otherwise the minimum DLA is set to 0.1.
Maximum DLA is generated like so:
If the vehicle is "heavy" type, then the maximum DLA is set to 0.1.
Otherwise, if the vehicle name begins or ends with "S1600" then the maximum DLA is set to 0.
If the vehicle name begins or ends with "M1600" then the number of axles that are defined is checked.
If there are 3 axles, the maximum DLA is set to 0.35.
Otherwise, the maximum DLA is set to 0.3.
If these name conditions aren't met, and the vehicle is not "heavy" type, the the maximum DLA is set to 0.4.
User can now select "By Specification" as an option in the "Truck Properties" dialogue box to generate the tire contact area automatically per spec.
The tire contact length is generated like so:
For a service load combination, 200mm is used.
For an ultimate load combination where the vehicle name begins or ends with "W80" or "A160", 400mm is used.
For an ultimate load combination where the vehicle name begins or ends with "M1600", 300mm is used.
Otherwise, 200mm is used.
The tire contact width is set to 500mm.
If the default inputs remain after selecting AS1597 as the specification, the minimum reinforcement checks include checking that every steel layer provides 150mm^2/m of reinforcement, that the minimum reinforcement ratio is 0.002, and that 15% of the steel required for flexure is provided. 300mm maximum bar spacing is not currently checked.