Research About3D Seismic Isolating Effect Of The System With RFPS Bearing And Plate Spring

In recent years, engineering structure seismic has been gradually developing frompassive seismic design to more effective modern isolation control technology which canstand against earthquake disasters, such as sliding friction bearings, laminated rubberbearings and so on. They have entered the stage of practical engineering and producedgood vibration isolation effect. However, because of the limitations of these isolationbearings and the multidimensional characteristics of earthquake itself, their spread andapplication are limited to a great extent. This paper puts forward the3D isolation systemwhich is a combination of Disc springs and RFPS bearings, and can not only solve three-dimensional base isolation problem effectively but also break up the limitations ofisolation bearings like laminated rubber bearings. This paper is based on multi-bodydynamics kinetic energy theorem and Lagrange equation and makes MATLAB softwareas a platform to analyze isolation performance of the3D isolation system which is acombination of Disc springs and RFPS bearings initially. The main research andconclusions are as follows:The3D isolation system is made from rolling friction pendulum and Disc springsthrough series connection. RFPS bearings is used to isolation in horizontal directionwhile Disc springs bearings is used to isolation in vertical direction. This3D isolationsystem not only has incredible capability of energy consumption and restoration but alsocan have appropriate stiffness and damping performance in three directions by changingthe friction coefficient and Disc springs’ numbers and keeping performance stable andstructure compact at the same time. Through the comparison between this system andsliding friction bearings, laminated rubber bearings and FPS bearings, this paperunderlines high research significance and wide application prospects of the3D isolationsystem.Put this isolation system into use on the frame structure for simulation analysis.According to the multi-body dynamics kinetic energy theorem and D’Alembert theorem,we can get a nonlinear equation which under the action of earthquake. Then solve theequation with program which by means of MATLAB computing platform. Thecalculation results show that: selecting arc radius and the rolling friction coefficient slidevalue properly; both the displacements between floors and floor acceleration of the upper floor structure’ dynamic response decrease greatly. Selecting the mounts of disc springsproperly and combined them optimally, we can make the maximum and minimumvertical compressible relative displacement closer to the static relative displacement, sothe internal force will be greatly reduced. Both the horizontal and vertical vibrationisolation effect are very obvious.Put the rolling friction pendulum system into use on the bridge structure forsimulation analysis. According to the Lagrange equation and D’Alembert theorem, wecan get a nonlinear equation which under the action of earthquake and program to obtainthe solution of the equation. The calculation results show that: Though the longitudinalhorizontal displacement and vertical displacement of bridge structure were increased, thebridge pier shear is reduced greatly. Selecting the rolling friction coefficient of thecontact surfaces and the slide radius properly, then make them combined optimally, wecan get the reasonable dynamic response solutions and ideal isolation effect at last.