Response Analysis Of PC Frame-shear Wall High-rise Seismic Isolation Structure Under Wind And Earthquake

Since the 21st century,the general environment of the construction industry has shown a trend of"stricter environmental protection requirements"and"increasing labor shortages".Under the new development background,prefabricated buildings have ushered in new development opportunities with the advantages of green environmental protection and labor cost saving.With the acceleration of urban modernization,seismic isolation technology has gradually been widely used in high-rise buildings with mature theoretical foundations and excellent shock absorption effects.Prefabricated buildings have problems such as weak connection of nodes and poor structural integrity.When they are subjected to earthquakes,the prefabricated structures may exhibit weaker seismic performance than cast-in-place structures;high-rise seismic isolation structures are wind-sensitive buildings.The question of whether the wind-induced response of structures in high wind pressure areas will exceed the limits remains to be explored;the probability of simultaneous wind and earthquakes during the service period of a building is relatively large.Once encountered,the damage degree is greater than that of the earthquake alone.At present,there are few Scholars have carried out research on the dynamic response of the prefabricated frame-shear wall high-rise seismic isolation structure under the coupling action of wind and earthquake.In view of the above,the main research content and main conclusions of this article are as follows:(1)To systematically understand the node connection mode of the existing fabricated frame-shear wall structure,analyze its force characteristics,and simulate fabricated nodes using a simplified way;The seismic isolation design of the frame-shear wall high-rise seismic isolation structure is carried out through the ETABS software,and the appropriate seismic isolation support layout scheme is determined.The PC frame-shear wall high-rise seismic isolation structure and the RC frame-shear wall high-rise building are established through the ANSYS software,two finite element models of the seismic isolation structure.(2)By selecting appropriate seismic waves,the RC structure and PC structure were subjected to structural response analysis under frequent and rare two-way ground motions,and the difference in seismic performance of the two structures under the action of frequent and rare earthquakes was compared and studied.(3)Through the harmonic superposition method,wind load time history curves with different return periods are generated.The dynamic time history analysis of the RC structure and the PC structure under the action of wind loads in different return periods is carried out.Compare the response of the two structures and discuss the difference in wind resistance performance of the two structures.(4)Considering the coupling effect of wind and earthquake,the dynamic time history analysis of PC frame-shear wall high-rise seismic isolation structure is carried out.Compare the difference of the structural response under wind alone,earthquake alone,wind and earthquake coupling.Discuss the impact of the coupling effect of wind and earthquake on the response of the PC frame-shear wall high-rise seismic isolation structure.According to the relevant research on the engineering case in this article,the research results show that:(1)PC structure and RC structure did not appear obvious damage under the action of frequent and rare earthquakes.Generally speaking,the seismic performance of the PC structure is slightly weaker than that of the RC structure.(2)When the PC structure and the RC structure are subjected to wind loads(basic wind pressure of 0.85k N/m~2)in 50 years,100 years,and 475 years respectively,as the wind load increases,the floor displacement,vertex acceleration,floor displacement of the upper structure and the response of the inter-torsion angle and the displacement,inclination angle of the seismic isolation layer has an obvious increasing trend.When PC structure and RC structure are under strong wind load,the vertex acceleration response of the structure tends to exceed the limit of human comfort.However,this value is significantly smaller than the acceleration response value under the action of 8degrees frequent earthquakes,and dampers can be added to the upper structure to improve the comfort level under the wind load.When the PC and RC structures are under the same wind load in the same return period,the wind resistance of the PC structure is slightly weaker than that of the RC structure.(3)When the PC structure is under the coupling action of wind and earthquake,the response of the structure is larger than that under the action of a separate earthquake,and as the coupled wind load increases,the structure response will increase,but with the increase in the intensity of the ground motion gradually increase,the influence of wind load on the structure’s maximum floor displacement,interlayer displacement angle,interlayer torsion angle,and seismic isolation layer inclination angle response will be reduced.