Study On Seismic Response Characteristics And Damping Application Of Large Space Grid Structure In High Intensity Area

Since the 21st century,Chinese economy and society are developing by leaps and bounds,and more buildings with long span and large space have appeared in the field of architecture in China.Compared with common structures,large-span space grid structures have complex mechanical characteristics due to the large number of bars and nodes,and the deformation is difficult to control.Moreover,the structure under the action of ground vibration in high-intensity area responds fiercely,causing more significant damage to the structure and greater economic loss.Based on the engineering background of Suqian Cultural Park Grand Theater,the finite element model of large-span space grid structure was established in this paper.Three natural seismic waves were input,and the amplitude was adjusted to the amplitude of frequent and rare earthquakes that met the requirements of high-intensity area.The seismic performance analysis and shock absorption control of the finite element model of the structure were carried out by using the time-history analysis method and the finite element software ABAQUS.This paper mainly carries out the following work:1.Based on the actual engineering background,the finite element model of long-span space grid structure is established,and its modal analysis is carried out,and the vibration frequency of the grid structure under the third-order mode is given.2.The displacement,shear and moment responses of the finite element model of the structure were calculated,and the dynamic analysis of the seismic response was carried out.The results showed that the grid structure was very sensitive to the x-direction and Y-direction inhomogeneity,and the epicenter distance had a great influence on the seismic response of the structure.3.In large-span space grid structure of pillars add viscous dampers,displacement,shear force and bending moment of suspension control analysis,at the same time,comparing with the results with the original structure of the seismic response analysis,the results show that for the large-span space grid structure,under severe earthquake shock absorption rate of the whole is better than many severe earthquake,use of viscous dampers to reduce isolation need targeted on shear response of the structure design,and the smaller the epicentral distance,its damping effect is better.