| This paper uses large-scale finite element analysis software ANSYS to establish a mega-frame structure model,load respectively the three different peak acceleration of ELCENTRO wave,Taft wave and Nanjing wave,in support of the mega-frame structure is not set and setting up the working condition of four groups of different forms of support,modal analysis and dynamic response analysis,analyzing the change of the supporting system effect on the overall seismic performance of the mega frame structure.Summary of the full text,the main content of the completed work and the main conclusions are as follows:(1)Under the action of different seismic waves,the mega-frames all present a displacement curve dominated by shear deformation,which conforms to the deformation characteristics of the frame structure.(2)The maximum horizontal displacement of the structure was obtained after loading the seismic waves in the four working conditions,among which the Nanjing wave had the most obvious influence on the mega-frame,especially under the loading of the Nanjing wave with the peak acceleration of 400cm/s2,the maximum horizontal displacement of the structure was 1.05361 m.But under the setting of three supporting system,the lower rate reached 31.45%,19.32% and 57.07%,and because of the addition of support system,makes the condition of two,working condition of working condition of three and four in the peak acceleration of 400 cm/s2 squared Nanjing wave under the action of the decrease of the working condition of the maximum horizontal displacement than the amplitude of 31.44%,20.36% and 57.07% respectively.It can be seen that the addition of the support system can effectively increase the overall stiffness of the structure,so the horizontal displacement of the model with support is significantly reduced in the earthquake compared with that of the model without support.Among them,compared with the other three working conditions,the seismic response of the model under the action of the acceleration peak of 400cm/s is the least.(3)Based on the working condition of the same loading different acceleration peak of the same seismic wave,the acceleration curve of structure along the height change,beating of observation points in the curve can be studied four kinds of structure of the weak layer are location in 1-7,the acceleration peak is 400 cm/s2 squared Nanjing waveimpact on structures is most obvious,three models in the acceleration peak value is 400cm/s2 squared Nanjing wave under the load of the structure relative to the bottom of the top of the acceleration magnification are respectively 4.26 times,3.98 times,3.94 times and 3.88 times,can be found in the structure after joining support system,the amplification ratio of the acceleration at the top of the structure is lower than that at the bottom,so it can be seen that the addition of the support system has certain help to the dynamic performance of the whole structure.Meanwhile,it can be seen that the Nanjing wave with a peak acceleration of 400cm/s2 has the most severe impact on the structure,which shows the difference between natural wave and artificial wave in seismic wave properties.(4)By comparing the model of interlayer displacement angle under more severe earthquake curve shows that under the blessing of supporting system,interlayer displacement angle of the model obtained the very good decreases,and the main frame support model due to the main frame 1-2 layers horizontal set up giant X to support,interlayer displacement angle decreases the size of the largest,especially under the action of in Nanjing wave,the interlayer displacement angle is less than the rest of the two waves. |
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