Research On Seismic Performance Of Steel Frame-Core Tube Structure With Strengthening Layer

With the continuous development of science and technology,the continuous improvement of high-rise building structure design theory and finite element theory,the selection of structural systems and building materials for high-rise buildings has gradually become diversified.Wide range of applications.In order to reduce the side shift of the structure and improve the overall lateral stiffness of the structure,a reinforcement layer is provided in the steel frame-core tube structure.Different structural forms of reinforcement layers will have different effects on the lateral displacement of the structure,and the stiffness and internal force of the floors where the reinforcement layers are located will vary to different degrees due to the different structural forms of the reinforcement layers,and the seismic performance of the structure will also be affected accordingly.change.Therefore,it is very important to study the influence of different structural forms on the seismic performance of the structure.This paper takes the main structure of the Gangcheng Plaza as the research object,and studies the influence of different structural forms on the seismic performance of the structure.(1)Five calculation models were established using SAP2000 finite element analysis software,namely model M1 without reinforcement layer,model M2 with oblique web truss reinforcement layer,model M3 with open web truss reinforcement layer,and solid web Model M4 with beam reinforcement layer and model M5 with opening beam reinforcement layer.(2)Perform modal analysis on the five established models,extract the mode shape,natural vibration period,and mode shape mass participation coefficient of each model,and study its changing law.(3)Analyze the response spectrum of the five established models,and analyze the influence of different structural forms of reinforced floors on structural floor displacement,interstory displacement angle,floor shear and bottom shear.(4)Using linear time history analysis method to perform supplementary calculations on the five established models under the action of frequent earthquakes,and compare the calculation results with the results of response spectrum analysis.(5)Comparing the analysis results,find out the model with better seismic performance,that is,the structural form of the reinforced layer.Use YJK software to perform static elasto-plastic analysis of the optimal model,analyze the mechanical performance of the structure under rare earthquakes,focus on the study of the lateral resistance curve of the structure,the displacement of the structural control point at theperformance point,the shear force at the bottom and The appearance order and distribution of plastic hinges.