Seismic Response And Energy Dissipation And Seismic Reduction Analysis Of Planar Irregular Concrete Frame Structures

Earthquakes are the products of internal structural changes caused by collisions of various plates in the world.They are natural phenomena.Because of the high population base,high density and rapid urbanization in China,the losses caused by earthquakes are even more immeasurable.With the continuous development of life and science and technology,irregular frame structures are becoming more and more common.However,because of the complexity of the force and force modes of irregular structures,the centroid and rigidity of structures are generally not coincident under strong earthquakes,and the asymmetric arrangement of components in frame structures will also cause torsional vibration effect of buildings,so they are more vulnerable to damage.The development of irregular structures has further sublimated the seismic theory,so the seismic performance analysis of irregular structures is very important.In this paper,the response of irregular frame structure under earthquake and energy dissipation and seismic analysis of the structure are mainly analyzed.The finite element software SAP2000 is used to carry out modal analysis,response spectrum analysis,time history analysis and Pushover analysis of the structure under different seismic waves.The weak links of the structure are identified,and seismic strengthening measures are taken for the corresponding weak parts.The main contents of the study are as follows:1.The structural model is established by using finite element software SAP2000,and the first 15 natural vibration periods,frequencies and mass participation coefficients are selected through modal analysis,and the dynamic characteristics of the structure are further studied.For the first three modes,the vibration direction of the first two modes is mainly translational,while the vibration direction of the third mode is mainly torsional,and the building joints are also studied.The modal correlation index of the model satisfies the limit requirements of the relevant codes.2.Two different types of support are set up for the pure frame structure model,i.e.inverted V-brace and single inclined bar brace.Response spectrum analysis is carried out under different seismic waves.The results are compared.It can be seen that in terms of the effect of seismic reduction,the effect of setting brace is better than that of not having brace,and the effect of setting inverted V-brace is better than that of setting single inclined bar brace.3.After the time-history analysis of the structural model,as far as the effect of shock absorption is concerned,the effect of setting braces is better than that of without braces,and the effect of setting inverted V-braces is better than that of setting single inclined bar braces.The results obtained are consistent with the results of response spectrum analysis.4.Pushover analysis of unsupported structural model can visually observe the curve relationship between capacity spectrum and demand spectrum of structural model during the whole process of change under earthquake and the process of plastic hinge generation,and then determine the weak position of the structure.5.By installing viscoelastic dampers on the unsupported model to analyze the seismic action,the optimal layout of viscoelastic dampers on the same floor in the structural model is bidirectional along both sides,while the optimal layout of different floors is staggered cross layout,which can more reasonably and effectively reduce the impact of seismic action on buildings.The research content of this paper can provide theoretical reference value for more scholars to study the model system of this building structure.