Three-Dimensional Nonlinear Simulation Analysis On Seismic Performance Of A Certain Overrun Angle Tube Structure

With the rapid development of super high-rise buildings,structural forms are gradually becoming diversified.As a new type of tubular structure,the angular tube structure is rarely used in domestic and foreign engineering examples.Its structural form,seismic performance,and seismic resistance Research on the setting of lines of defense is also rarely involved.In order to provide a corresponding reference for this kind of structure,this paper takes a certain over-limit angle tube structure as an example to conduct research on it.The main research contents are as follows:Due to the particularity of the plane layout of the angular tube structure,it is more reasonable to use the frame tube structure or the tube-in-tube structure for design and calculation in the design,and there is no clear stipulation in the relevant regulations.After consulting the relevant structural system identification literature,the angular tube structure under the combined action of frequent earthquakes and wind loads,calculated the overturning moment percentage,shear percentage,period,maximum interstory displacement angle,shear hysteresis and other mechanical indicators.Referencing the relevant frame-tube and tube-in-tube structure system discrimination standards,it is finally determined that the corner tube structure is more reasonable according to the frame-tube structure design.Without changing the size of the corner tube and the distance between the corner tubes,adjust the column distance and beam height of the outer frame of the corner tube structure,and establish six groups of 48 models with different beam heights and column distances to further analyze the structure system and obtain the corner tube The cylinder structure conforms to the column spacing and beam height requirements that need to be met when the frame tube or tube-in-tube structure is subjected to the force characteristics.Since then,taking the engineering example of the over-limit-angle tubular structure as the research object,the performance-based seismic design method is used to conduct seismic analysis,and the corresponding models are established by PKPM,PMSAP,ETABS,Midas Building and other programs,and small earthquakes are performed respectively,Moderate earthquake and large earthquake analysis,according to the analysis results,it is concluded that the corner tube structure meets the set performance target requirements.In order to further study the rationality of the anti-seismic defense line of the over-limit angle tube structure,three models were designed by changing the shear force sharing ratio between the angle tube,the core tube and the outer frame.After calculation and analysis,it was found that After the shear force sharing ratio is changed,the seismic defense line of the structure has changed.According to the size of the above model and the calculated reinforcement information,a nonlinear finite element analysis method based on the theory of three-dimensional solid degraded virtual laminated element is used to analyze the seismic performance.In order to verify the rationality of the analysis method,this paper uses the VFEAP finite element program based on the analysis method to simulate a finite element simulation of a frame.The calculated results are in good agreement with the test results,thus explaining the practicality of the analysis method.Sex and accuracy.Establish corresponding finite element models for the above three models,and compare the three models with the calculated load-displacement curve,maximum inter-story displacement angle,structural failure,stiffness degradation and shear redistribution law,and the yield degree of steel bars in special parts.The comprehensive evaluation of the seismic defense line of this kind of structure provides a certain reference and reference for future research on the seismic design of such structures.