# Bidirectional Section

This command allows the user to construct a Bidirectional section, which is a stress-resultant plasticity model of two coupled forces. The yield surface is circular and there is combined isotropic and kinematic hardening.

```tcl section Bidirectional $secTag $E $Fy $Hiso $Hkin <$code1 $code2> ```

secTag

unique section tag

E

elastic modulus

Fy

yield force

Hiso

isotropic hardening modulus

Hkin

kinematic hardening modulus

code1

section force code for direction 1 (default = Vy)

code2

section force code for direction 2 (default = P)

NOTES:


Code Developed by: Michael H. Scott