Units Selector
Both SI as well as English units systems can be used in SeismoStruct, with different possible "combinations" being available for each of these two, since users are given the possibility of choosing between the use of two diverse units to define Length and Force quantities; as the units of these two base quantities are changed by the users, the program automatically adjusts the units of the remaining derived entities (Mass, Stress, Acceleration, etc.). Customisation of the Units system is carried out in the Units Selector dialog box, accessible from the main menu (Tools > Units Selector) or through the corresponding toolbar button. 
Below, please find a summary of the units systems that can be used in SeismoStruct.
SI Units
|
Length
|
Force
|
Mass
|
Stress
|
Acceleration
|
Specific Weight
|
|
millimetre (mm)
|
Newton (N)
|
tonne (tonne)
|
MegaPascal (MPa)
|
(9807) mm/sec2
|
N/mm3
|
|
millimetre (mm)
|
kiloNewton (kN)
|
kilotonne (ktonne)
|
GigaPascal (GPa)
|
(9807) mm/sec2
|
kN/mm3
|
|
metre (m)
|
Newton (N)
|
kilogram (kg)
|
Pascal (Pa)
|
(9.81) m/sec2
|
N/m3
|
|
metre (m)
|
kiloNewton (kN)
|
tonne (tonne)
|
kiloPascal (kPa)
|
(9.81) m/sec2
|
kN/m3
|
English Units
|
Length
|
Force
|
Mass
|
Stress
|
Acceleration
|
Specific Weight
|
|
inches (in)
|
pound (lb)
|
lb*sec2/in
|
pound per square inch (psi)
|
(386.1) in/sec2
|
lb/in3
|
|
inches (in)
|
kilopound (kip)
|
kip*sec2/in
|
kip per square inch (ksi)
|
(386.1) in/sec2
|
kip/in3
|
|
feet (ft)
|
pound (lb)
|
lb*sec2/ft (slug)
|
pound per square foot (psf)
|
(32.17) ft/sec2
|
lb/ft3
|
|
feet (ft)
|
kilopound (kip)
|
kip*sec2/ft (kslug)
|
kip per square foot (ksf)
|
(32.17) ft/sec2
|
kip/ft3
|
Further, two different rebar typologies may be employed, European and American. It is noted that any combination of units (SI or English) and rebar types (European or American) may be used, for example it is possible to use SI units with American rebars, as it is e.g. customary in Latin American countries.
Notes
- Rotations are always given in radians
- kilo=1E+3, Mega=1E+6, Giga=1E+9