A model for hysteretic behavior of rhombic low yield strength steel added damping and stiffness

The Low Yield Strength Steel (LYS) has the superiority over long period of low cycle fatigue, high strain hardening rate and impressive ductility to overcome the local fracture problem existing in regular A36 steel plate. With elastoplastic characteristics and experimental verification, it becomes a good material considered for added damping and stiffness (ADAS) since the stress–strain relationship of LYS performs yielding much earlier than that of A36 steel. Thus, Wen’s Model and the bi-linear model, simulated for A36 energy absorber cannot properly analyze energy dissipation while A36 are replaced by LYS. Therefore, the modified Wen’s Model is proposed to reproduce the complicated nonlinear strain hardening in seismic resistance of rhombic LYS under reciprocating loading test. The numerical simulation and experimental data can match each other to reveal that the proposed model has capability in predicting the hysteresis energy dissipation behavior of rhombic low yield strength steel plate. This model also can be easily integrated with a dynamic analysis program.