# 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).