Analysis Of Seismic Isolation Performance Of Double Towers With Large Chassis And Unequal Height

In recent years,China's large chassis construction has sprung up such as commercial services,office buildings,dwelling house,hospital and other USES,because of its wide application and high utilization rate,this kind of building is favored.But at present,the large chassis construction for the earthquake and resistant structure.When the earthquake comes,the "lifeline" building such as hospital,their stability is particularly important,so the large chassis isolation structure and its shock absorption performance is necessary to do in-depth research,aiming to arrive at the conclusion that "big earthquake can be repaired".In this paper,the equivalent mechanical model and motion control equation of the large chassis double tower structure are proposed,and the finite element software ABAQUS is used to study the seismic response of the large chassis double tower structure with unequal height.The specific research contents are as follows:1.Firstly,based on the existing high-rise seismic structure and the simplified mechanical model of the isolated structure,the equivalent mechanical model and motion control equation of the large chassis structure are proposed.The finite element software ABAQUS is used to establish the seismic isolation structure and isolation of the large chassis with different heights.The numerical simulation model of the structure is loaded with different ground motions.The mean value difference between the finite element values and theoretical values is determined by comparing the double-column seismic structure of the large-span unequal tower and the base bending moment and base shear force of the isolated structure.Based on the result that the mean value different rate is within 20%,the relevant conclusions are obtained.2.Using ABAQUS software 1:1,the finite element model of the large-story single tower seismic structure and the base isolation structure are established in the same way as the existing experiment.The same seismic wave is loaded and tested,and the numerical simulation and experimental results are compared.The difference rate is within 10%,which proves the feasibility and rationality of using the finite element software ABAQUS to analyze the seismic isolation performance of the large chassis.3.The PKPM software is used to complete the design and reinforcement of the double-tower structure with large chassis.The finite element model of the unequal-high double tower seismic structure and the base isolation structure are established by finite element software ABAQUS,and time-history analysis is carried out.Draw the relevant conclusions through the comparative analysis of the seismic structure and the base isolationstructure under the action of 8 degree multiple earthquakes,the damping effect of different ground motions,isolation layer damping ratio and isolation layer isolation period.It can be concluded that the shock absorption effect of the base isolation structure under different ground motions is obvious.The isolation period and damping ratio of the isolation layer are closely related to the isolation performance of the double-tower structure with large chassis.The specific parameters and configuration scheme of the isolation device are recommended based on the actual engineering conditions.