Constitutive behavior of low yield point steel LYP160

order to investigate the constitutive behaviors of low yield point steel LYP160 and propose the accurate cyclic constitutive model, cyclic tests on this steel were carried out. The mechanical performances were studied, including monotonic behavior, hysteretic behavior, failure mode and energy dissipation capacity. Ramberg Osgood model was used to obtain the parameters of hysteretic skeleton curves. Chaboche model was adopted to calibrate the key parameters of cyclic constitutive model, which were used to predict the hysteretic behaviors of low yield point steel plate shear wall structures. The results show that though low yield point steel LYP160 has lower yield strength, its seismic behaviors are better, the ductility of LYP160 is 2.3-2.8 times of normal strength steel and high strength steel. The energy dissipation coefficients are around 3.6, which are larger nearly 30% than normal strength steel and high strength steel. The LYP160 has obvious monotonic and cyclic hardening behaviors, indicating higher load-carrying capacity. The hysteretic behavior is composed of isotropic and kinematic characteristics, and the isotropic characteristic is in control, which is different from normal strength steel and high strength steel.