| Earthquake and wind are both load effects that cannot be ignored in structural design.Many studies have shown that although the probability of earthquake and wind coupling is small,its disaster impact is enormous.Research related to multi disaster coupling has also received increasing attention from scholars.The frame-tube structure has good mechanical performance,high applicability and wide application.Therefore,it is necessary to study the dynamic performance of frame-tube structures.Currently,there is a slight lack of research on the dynamic response of frame-tube structures with strengthened and damping layers under the coupling effect of earthquake and wind.Based on an example of a frame tube structure,this article analyzes the structural response of frame tube structures with different strengthened and damping layers under earthquake,wind vibration,and coupling of earthquake and wind using ETABS finite element software.The main contents and conclusions are as follows:(1)Seventeen scenario models were established by performing response spectrum analysis on the original structure.The results of seismic analysis show that the stiffness enhancement of the middle part of the structure by the strengthened layer can effectively limit the displacement deformation of the substructure,and has a strong control effect on the peak value of the interstory displacement angle curve of the upper floors in the building.The setting of damping layer can achieve 11% damping rate in both X(length direction)and Y(width direction)directions of the structure,while the structure with hybrid arrangement of strengthened layer and damping layer has disadvantage in Y direction with only 5.8% damping rate,and 15.1% damping rate in X direction.(2)Using MATLAB software to generate pulsating wind speed time history based on harmonic superposition method,the wind vibration analysis results show that the structural wind vibration response is small,and the maximum energy dissipation ratio of the damper of the damping layer is only 1.5%,which cannot effectively exert the energy dissipation effect and has no significant control effect on the structural wind vibration response.Placing a strengthened layer at the higher position of the structure can achieve better control of wind vibration displacement response.The reduction rate of wind vibration response of the structure with strengthened layers is 9.6% while the combination of the strengthened layer and the damping layer can increase the reduction rate of structural response to 12.3%.The structural response increases significantly when strong winds and earthquakes are coupled.The analysis results show that: the scheme of setting a strengthened layer in the middle of the damping layer has better control ability for the displacement at the top of the structure,and the damping rate of the top layer can reach 15.5% under rare earthquakes,but it also increases the shear force at the bottom of the structure;the control effect of the damping layer scheme is weaker than that of the strengthened layer scheme,and the highest damping rate is only 7.1%,but the control effect of the structural response is more uniform,and the structural displacement and displacement angle response can be attenuated at the full height.(4)According to the comparison of the results of various schemes,it is recommended to use the design scheme of combination damping layer with higher placement of strengthened layer when considering the wind resistance design of the structure as the main consideration;When considering the seismic effect and the coupling effect of seismic and wind loads,setting damping layers at 2/5 and 4/5 times the building height,and setting the strengthened layer at3/5 times the building height(Model 11)have the best effect on structural deformation control.If there is a high demand for shear force at the bottom of the structure,setting damping layers at 1/3,1/2,and 2/3 times the building height(Model 7)has better structural response control. |
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