4.13.5.8. SAWS Material¶

uniaxialMaterial('SAWS', matTag, F0, FI, DU, S0, R1, R2, R3, R4, alpha, beta)

This file contains the class definition for SAWSMaterial. SAWSMaterial provides the implementation of a one-dimensional hysteretic model develeped as part of the CUREe Caltech wood frame project.

`matTag` (int)	integer tag identifying material
`F0` (float)	Intercept strength of the shear wall spring element for the asymtotic line to the envelope curve F0 > FI > 0
`FI` (float)	Intercept strength of the spring element for the pinching branch of the hysteretic curve. (FI > 0).
`DU` (float)	Spring element displacement at ultimate load. (DU > 0).
`S0` (float)	Initial stiffness of the shear wall spring element (S0 > 0).
`R1` (float)	Stiffness ratio of the asymptotic line to the spring element envelope curve. The slope of this line is R1 S0. (0 < R1 < 1.0).
`R2` (float)	Stiffness ratio of the descending branch of the spring element envelope curve. The slope of this line is R2 S0. ( R2 < 0).
`R3` (float)	Stiffness ratio of the unloading branch off the spring element envelope curve. The slope of this line is R3 S0. ( R3 1).
`R4` (float)	Stiffness ratio of the pinching branch for the spring element. The slope of this line is R4 S0. ( R4 > 0).
`alpha` (float)	Stiffness degradation parameter for the shear wall spring element. (ALPHA > 0).
`beta` (float)	Stiffness degradation parameter for the spring element. (BETA > 0).