Quantification of energy-dissipating capacity for self-centering shear walls considering variable loading sequences

This study investigates and quantifies the energy-dissipating capacity of self-centering shear walls (SCSW) based on the degradation observed under variable loading sequences. 14 SCSWs with diverse structural features are designed and subjected to numerical simulations under cyclic loads with varying amplitudes and loading sequences. An exponential model is employed to evaluate the deterioration of energy-dissipating capacity in SCSWs, accounting for variations in loading sequences and structural features. This model is then utilized to estimate the energy-dissipating capacity for SCSWs. Results show that nonlinear deformation histories have significant impacts on the hysteretic responses and the deterioration of energy-dissipating capacity in SCSWs. SCSWs with higher stirrup reinforcement ratios and concrete strength exhibit less deterioration in energy-dissipating capacity, especially under ultimate conditions. Conversely, a larger self-centering parameter reduces the energy-dissipating capacity under loading sequences with amplitudes smaller than ultimate deformations. The proposed approach can provide reliable estimation of energy-dissipating capacity for SCSWs considering both loading sequences and structural features.