The Dynamic Stability Study On The Piezoelectric Reticulated Shell

With the increase of people’ demands for large space buildings, reticulated shellstructure which has its application is widely used in practical engineering. Steel is akind of defect sensitivity materials, however, reticulated shell structure is composed ofsteel member bars, and the bar’s slenderness ratio is generally higher, the structuresoften occur firstly buckling failures under the dynamic incentives, such as wind loadand earthquake action. Therefore, studying the dynamic stability of long-spanreticulated shells are very necessary, in fact, this problem has become a hot researchingtopic in structure field.In engineering design, solving the reticulated shell buckling is to increase the bararea. This method can change the slenderness ratio of the bar, playing a control effect,but steel consumption quantity is large, so dose the weight, and not particularlyeconomical. This paper derived the formula for calculation the shell structures ofdynamic unstable region according to Bolotin’s Elastic dynamic stability theory andusing the stability criteria to judge the dynamic stability of the Piezoelectric ReticulatedShell.Taking the piezoelectric friction damper bar to replace some common link of thereticulated shell structure, through electricity output characteristics or dampingcharacteristics of the principal component bar, to adjust the dynamic characteristics ofstructure, to achieve the goal of control structure instability. Research work as follows:(1) Using finite element software ANSYS10.0and SAP2000, reticulated shell isanalyzed under different rise-span ratio and span of elastic and elastic-plastic vibrationresponse laws, and introduces the current reticulated shell structure under the action ofstatic and dynamic calculation methods and criteria. (2) Starting from the general situation of elastic system, the application theorydeduced the calculation method under the load of dynamic instability area in itsparameters.Combining with the knowledge of dynamics of the reticulated shell isobtained in the earthquake under the action of the main engine and influencing factorsof unstable area.(3) The optimization of piezoelectric friction damper bar are embedded intosingle-layer reticulated shell structures, introducing the stability criteria, to analyze withpiezoelectric friction damper bar net shell structure under dynamic load of dynamicinstability.Through the analysis we can konw that only using ANSYS software to take thefinite element time history analysis can’t determine structural instability or not, unlessneed to embed the instability criterion can more intuitive.Reticulated shell structureinstability region has something with the damping, node quality and load form, thepiezoelectric smart member can be used to change the nature of the average bar, in orderto adjust the structure of the dynamic instability region;take the Piezoelectric frictiondamper in to the net shell structure, combined with the energy criteria (stability criteria),can reflect the structural response significantly inhibitory effect, instructions will bepressing pole pieces into use in the network shell structure, can effectively control thevibration response of the structure, the realization of structure vibration active control.To solve the problem of the reticulated shell structure instability plays an importanttheoretical significance and practical value.