Tedds contains a number of pre-defined variables, which you can use in all your calculations. The following table presents all pre-defined system variables in Tedds.
| Predefined system variables |
| Base system variables |
General |
π = 3.1415926536 |
| pi = 3.1415926536 |
| gacc = 9.80665 m/s² |
| ee = 2.7182818285 |
| Water |
Kinematic viscosity at 10°C |
νwater@10 = 0.00000131 m²/s |
| Density at 4°C |
ρwater@4 = 1000 kg/m³ |
| Concrete |
BS 8110 |
ΕS8110 = 200 kN/mm² |
| αC = 10x10-6°C-1 |
| νC = 0.2 |
| mc = 16 |
| ρC.norm = 2400 kg/m³ |
| ρC.norm_w = 2500 kg/m³ |
| ρC.light = 1800 kg/m³ |
| ρC.light_w = 1900 kg/m³ |
| AC |
ρC.norm = 2400 kg/m³ |
| ρC.light = 1800 kg/m³ |
| BS5400 |
ρC5400 = 2500 kg/m³ |
| αC5400 = 12x10-6°C-1 |
| Εy_5400 = 200 kN/mm² |
| Steel |
General |
νS = 0.3 |
| αS = 12x10-6°C-1 |
| BS5950 |
ρS5950 = 7860 kg/m³ |
| ΕS5950 = 205kN/mm² |
| GS5950 = 78.8 kN/mm² |
| KS5950 = 170.8 kN/mm² |
| EC3 |
ρSEC3 = 7850 kg/m³ |
| ΕSEC3 = 210kN/mm² |
| GSEC3 = 80.8 kN/mm² |
| KSEC3 = 175 kN/mm² |
| BS5400 |
ρS5400 = 7860 kg/m³ |
| ΕS5400 = 205kN/mm² |
| GS5400 = 80 kN/mm² |
| Steel |
AISC / LRFD |
ρSLRFD = 490 lb/ft³ |
| ΕSLRFD = 29000 ksi |
| GSLRFD = 11200 ksi |
| AISC / ASD |
rSASD = 490 lb/ft³ |
| ΕSASD = 29000 ksi |
| GSASD = 11200 ksi |
| ACI |
ΕACI = 29000 ksi |
| Aluminum
|
General |
ρAl = 2720 kg/m³ |
| ΕAl = 70 kN/mm² |
| GAl = 26 kN/mm² |
| KAl = 69 kN/mm² |
| νAl = 0.33 |
| αAl = 22x10-6°C-1 |
