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 |
| g acc = 9.80665 m/s² |
| e e = 2.7182818285 |
| Water |
Kinematic viscosity at 10°C |
ν water@10 = 0.00000131 m²/s |
| Density at 4°C |
ρ water@4 = 1000 kg/m³ |
| Concrete |
BS 8110 |
Ε S8110 = 200 kN/mm² |
| α C = 10x10 -6 °C -1 |
| ν C = 0.2 |
| m c = 16 |
| ρ C.norm = 2400 kg/m³ |
| ρ C.norm_w = 2500 kg/m³ |
| ρ C.light = 1800 kg/m³ |
| ρ C.light_w = 1900 kg/m³ |
| AC |
ρ C.norm = 2400 kg/m³ |
| ρ C.light = 1800 kg/m³ |
| BS5400 |
ρ C5400 = 2500 kg/m³ |
| α C5400 = 12x10 -6 °C -1 |
| Ε y_5400 = 200 kN/mm² |
| Steel |
General |
ν S = 0.3 |
| α S = 12x10 -6 °C -1 |
| BS5950 |
ρ S5950 = 7860 kg/m³ |
| Ε S5950 = 205kN/mm² |
| G S5950 = 78.8 kN/mm² |
| K S5950 = 170.8 kN/mm² |
| EC3 |
ρ SEC3 = 7850 kg/m³ |
| Ε SEC3 = 210kN/mm² |
| G SEC3 = 80.8 kN/mm² |
| K SEC3 = 175 kN/mm² |
| BS5400 |
ρ S5400 = 7860 kg/m³ |
| Ε S5400 = 205kN/mm² |
| G S5400 = 80 kN/mm² |
| Steel |
AISC / LRFD |
ρ SLRFD = 490 lb/ft³ |
| Ε SLRFD = 29000 ksi |
| G SLRFD = 11200 ksi |
| AISC / ASD |
r SASD = 490 lb/ft³ |
| Ε SASD = 29000 ksi |
| G SASD = 11200 ksi |
| ACI |
Ε ACI = 29000 ksi |
Aluminum
|
General |
ρ Al = 2720 kg/m³ |
| Ε Al = 70 kN/mm² |
| G Al = 26 kN/mm² |
| K Al = 69 kN/mm² |
| ν Al = 0.33 |
| α Al = 22x10 -6 °C -1 |
