Research On Performance-based Deformation Index Limits And Damage Index Of Double Steel Plate Concrete Shear Wall

Performance-based seismic design requires that the designed structural members can maintain the original performance level under the action of earthquakes.The design principle of "three levels,two stages" in the current code is mainly based on the calculation of the bearing capacity to judge the performance level of the component,but the code does not clearly give the deformation limit of the component under each performance state.With the rapid development of super high-rise buildings,double steel plate concrete shear walls have been widely used due to their excellent seismic performance,higher load-bearing capacity and smaller cross-sectional dimensions.At present,relevant researches at home and abroad mainly focus on load-bearing capacity and seismic performance,but there are few studies on its seismic performance evaluation based on deformation and damage.Therefore,it is necessary to determine the performance-based deformation index limit and damage index of the double steel plate concrete shear wall.The main research contents of this article are:(1)Based on ABAQUS and Open Sees finite element software,select appropriate material constitutive models,element types,interactions between components,loading methods and constraints,respectively,and perform finite element modeling analysis on double steel plate concrete shear walls.And verify the rationality of the numerical model through experiments.(2)The test data of 31 double steel plate concrete shear walls were collected,and the shear span ratio,axial compression ratio,edge restraint component steel ratio,edge restraint component reinforcement ratio,wall steel ratio,bending-shear ratio,etc.were analyzed.The influence of factors on its destruction form.According to the current specifications,432 numerical models of double steel plate concrete shear walls have been designed.Comprehensive test and finite element results are used to classify the failure modes of double steel plate concrete shear walls using shear span ratio,axial compression ratio,and bending-shear ratio as parameters.The specific classification criteria are given.(3)Determine the performance points of the component based on the material strain,and combine the existing research results and the characteristics of the double steel plate concrete shear wall to obtain the performance state classification standard of the double steel plate concrete shear wall.By analyzing the change trend of the macroscopic displacement-load curve and the displacement angle limit value,the influence of each parameter on the deformation performance of the double steel plate concrete shear wall is studied.Through correlation analysis and linear regression analysis,the calculation formulas for the displacement angle limit value of each performance state under different failure modes are proposed,and the displacement angle limit value table of each performance state of the double steel plate concrete shear wall under the 95% guarantee rate is given.(4)Based on Open Sees,perform finite element analysis on the shear wall whose failure mode is bending control,analyze the influence of each parameter on the energy dissipation capacity of the shear wall,calculate the combination coefficient β in the modified Park-Ang damage model,and get It is suitable for the damage model of the double steel plate concrete shear wall based on the dual criteria of deformation and energy dissipation;the normal distribution is used as the distribution density function to fit the cumulative probability density of each damage state of the double steel plate concrete shear wall member,and each The probability density model parameters of the damage state give the recommended value of the damage index interval for the double steel plate concrete shear wall whose failure mode is controlled by bending under the 95% guarantee rate.