Passive,Semi-active,Hybrid Control And Shaking Table Test For High Rise Industrial Building

With the increasing of the diversification of the building body and asymmetric structure in the seismic area.The study of lateral-torsional coupled vibration control of structures has become the focus of research.Previous earthquake disasters show that the eccentricity of irregular structures cause reverse damages.Seismic behavior of lateral-torsional coupling vibration structure degrade,making the eccentric structure more easily destroyed than the symmetric structures.In some cases,reverse response may become the main factor.Traditional design method is to increase the structure's torsional rigidity and improve the seismic performance of eccentric structures.In established cases of building function,there is little room for structural adjustment.The section of structural member will increase with the increase of torsional rigidity.Meanwhile the structure of the node is very complex,so the traditional way to resist vibration is limited.With the popularity of energy dissipation and the development of the structure vibration control theory,which open up a new way for the research and design of earthquake resistance of engineering structures.The research on reducing the vibration response of the eccentric structure by using the vibration control device has been launched in succession,but the research on the eccentric industrial plant is insufficient.According to the eccentric structure of high-rise plant with translational and torsional vibration characteristics under earthquake,the vibration control of eccentric structure system is studied in this paper.The research belongs to a part of the National Natural Science Foundation of China “Theoretical research on vibration control of high-rise industrial building”(project number:51278393)and the following innovative results are obtained:(1)For the single layer eccentric structure system,the non-proportional damped motion equation of the structure system is obtained by using the dynamic equilibrium.An approximate real space decoupling method is proposed to decouple the motion equations,which improves the accuracy of the dynamic response of the structure in the real number field.(2)The vibration control of the bidirectional eccentric isolated structure considering the ground rotation component is studied,and the influence of the ground rotation component on the torsional response of the structure is controlled by using the vibration isolation device.Rotational components will increase the torsion vibrations of the structure,some important and notable eccentric structures in the seismic design,the influence of ground rotation component should be considered,isolation device can reduce the influence of ground rotation component on the torsional response of the structure.(3)Using the suspension mass plate to control ground motion response of a bidirectional eccentric structure.Research results show that the suspension mass plate has control effect on the translational and torsional vibration of the structure,and suspension mass plate has large damping ratio of torsional vibration of structure.So it can be used as effective measures for the control of torsional vibration.(4)Taking Jiangsu SuoPu chemical plant of steel structures as a research object,this plant is eccentric with equipment,the finite element model of the powerhouse structure was established by using the finite element analysis software ANSYS,based on the model of free vibration and dynamic response analysis,the translational and torsional vibration floor with relative large response of steel frame structure is found out,and defined as the weak layer;meanwhile,the seismic response of the equipment in the workshop is analyzed;these provide the basis for the development of structure control strategy.(5)Continue to take Jiangsu SuoPu chemical plant of steel structures as research object,a hybrid control of eccentric structure is studied.For the vibration control problem of equipment and steel framework structure,three vibration control schemes are proposed: all using viscous dampers on equipment and steel framework for vibration control,all using MR elastomer dampers on equipment and steel framework for vibration control,and using viscous dampers and MR elastomer dampers for hybrid vibration control(viscous dampers control equipment vibration,MR elastomer damper control vibration of steel frame).Through the comparison of the damping effect,the control strategy and the economic factor of these three kinds of damping schemes the hybrid vibration control scheme for viscous dampers and MR elastomer dampers is preferred,which use 12 viscous dampers to control the vibration of the device and 12 MR elastomer dampers control the vibration of steel frame.Installed around the device with 12 viscous dampers make the shock absorption rate of displacement response reaches to 37.06%,but vibration control effect is small for steel frame structure.Installed in steel frame translational and torsional vibrations of the larger floors with 12 MR elastomer dampers,the average displacement in X direction of the 2th floor,6th floor and 8th floor of the steel frame structure were reduced by 37.86%,33.45% and 36.57% respectively,the torsional response of 5th floor is reduced by 37.37%(the relative torsion of 6th floor and 5th floor is greatly reduced).When the interaction of viscous damper and MR elastomer damper,the translational and torsional vibration control effect of steel frame structure is better than the effect of a single kind of damper.(6)Select the 1:8 scale designed vibration test scale model;the dynamic characteristics of structure system is tested through shaking table test,the test are carried out on three working conditions,which are without control,installation of viscous dampers on the device only,and installation of viscous dampers and MR elastomer damper.Test results show that the experimental results of the structural fundamental frequency and time-history response agree well with ANSYS calculated results.Shaking table test model can well reflect the original structural characteristics and vibration response;device installed with 12 fluid viscous dampers have a significant damping effect on the equipment,but the effect on steel frame is very small.While the steel frame structure equipped with viscous dampers and MR elastomer dampers have a significant control effect on vibration of structure.