Analysis Of Seismic Performance And Vulnerability Of Steel Frame-RC Shear Wall Structures

Using finite element software SAP2000,a steel frame structure,a steel frame-RC shear wall structure,a steel frame-RC core tube structure model were established,and the structure was subjected to modal analysis,response spectrum analysis and time history analysis.The results showed that:(1)After adding the shear wall and the core tube members,the lateral stiffness of the structural system increases obviously.Under the same material usage,the steel frame-RC shear wall structure has better stiffness improvement effect.(2)Steel frame-RC shear wall structure and steel frame-RC core tube structure,lateral stiffness distribution along the floor is uniform,no obvious weak layer,deformation curve for the curved shear type.(3)The simultaneous response spectrum method is more secure than the time history analysis method.The static elasto-plastic analysis(Pushover)of the steel frame-RC shear wall structure was compared with the steel frame structure from the aspects of interlayer displacement angle,base shear force,plastic hinge development,and the results showed that:(1)steel frame Compared with the steel frame structure,the RC shear wall structure has improved the lateral stiffness by 49.9%,the ultimate bearing capacity by 47.2%,and the floor shear has increased while the floor shear has increased.(2)The steel frame-RC shear wall structure has two anti-seismic lines of defense under the action of earthquakes.The plastic hinges are developed sufficiently and the seismic performance is better.Two frequency bands were selected from the response spectrum for the seismic waves downloaded from the Peer Strong database.Midas Building software was used to select 10 sites that met the site conditions.The steel frame-RC shear wall structure was used as an example and variable step length modulation was used.Incremental dynamic analysis(IDA),followed by vulnerability analysis,to obtain the failure probability of steel frame-RC shear wall structure corresponding to different earthquake intensity;the results show that:(1)discrete dynamic analysis results of different seismic wave discrete Larger sex,you can use the quantile statistics method for IDA curve,define the limit state point on the quantile curve,and get the probability of the steel frame-RC shear wall structure surpassing different limit states under the action of ground motion..(2)Under the effect of small earthquakes,the steel frame-RC shear wall structure is relatively easy to reach normal use.Under the action of large earthquakes and giant earthquakes,the probability of surpassing the safe use limit state is very low,and the coefficient of collapse resistance reserve(CMR)It is 5.462,which shows that the probability of collapse of the structure is very low,and the ductile energy-consuming capacity is strong.