Research On Energy Consumption Capacity Model Of RC Components With Variable Amplitude Hysteresis

China is located at the intersection of the two major seismic zones in the world,with frequent earthquake disasters.The occurrence of earthquakes has caused huge casualties and immeasurable property losses in China,so the theoretical study of seismic design is particularly important.Among them,the concept of energy-based seismic design is clear,which can better reflect the comprehensive impact of earthquake intensity,spectrum characteristics and strong earthquake duration on the structure.At present,energy-based seismic design is at the forefront of seismic research because of its superior theoretical advantages.After nearly a century of efforts by researchers around the world,it has gradually matured.Compared with other researchers,the existing calculation model is a simple,more accurate and more promising model for calculating the energy dissipation capacity of variable-amplitude hysteretic RC components,but its application scope is limited at present.Based on the existing calculation models,the energy dissipation capacity of 129 RC members with bending failure,axial force and rectangular cross-section selected from PEER database is estimated,and the influence of design parameters(reinforcement ratio,stirrup ratio,axial compression ratio,concrete strength and shear span ratio)on the estimation results is analyzed.Based on the above analysis results,the regression analysis based on displacement and stirrup ratio is carried out,and the revised new estimation models are proposed respectively.The analysis results show that the deviation rate of cumulative energy consumption estimation obtained by using the calculation model for the above-mentioned components is large and discrete;the correlation between the deviation rate of cumulative energy consumption estimation and the reinforcement ratio,axial compression ratio,concrete strength and shear span ratio of the specimens is not clear,but with the change of stirrup ratio,there is a more obvious linear relationship.Through regression analysis of yield displacement of specimens,the revised formula for yield displacement can also greatly improve the estimation ability of the calculation model.Through regression analysis of stirrup ratio,the revised formula of characteristic parameters in the calculation model is put forward,which greatly improves the accuracy of energy dissipation capacity estimation of RC members.Compared with the original calculation model,the two revised new calculation models can greatly improve the estimation ability,but the latter has clear concept and more theoretical basis,which is a more valuable research direction in the future.