Research On Seismic Performance Of Cam Response Amplification Device Of Metal Damper And Energy Dissipation Structure

The traditional seismic structure consumes seismic energy by strengthening the structural members of the structure,increasing the stiffness of the structure,and allowing the structure to enter nonlinearity under large earthquakes.Therefore,the traditional seismic design relies only on the structure itself to resist earthquakes,while considering economics.It is difficult to ensure the safety of the structure in the event of a large earthquake.The energy-dissipation damping technology dissipates the seismic energy by arranging the energy-dissipating device(damper)in the structure,and relies on the deformation movement of the energy-dissipating device to increase the damping ratio of the structure,thereby reducing the transmission.The seismic energy to the structural body member increases the safety and durability of the structure.Although there are many types of dampers and different performances,the traditional dampers are difficult to fully utilize the energy-consuming ability on the one hand,and on the other hand,they often fail beyond their design specifications when encountering a rare earthquake,resulting in a structure.Collapse and destruction.Therefore,how to ensure that the damper can fully exert the energy-consuming ability and the performance does not fail under the seismic action of all levels is an important scientific problem in the field of energy-absorbing and shock-absorbing technology.In recent years,domestic and foreign research scholars have developed a variety of damper response amplification devices based on the lever mechanism,rack and pinion mechanism and rotating mechanism in the mechanical field.When the structure is at a small deformation and small speed,the damper can fully exert the hysteresis.Back to energy consumption.However,in the rare or even rare earthquake,the damper faces the problem that the displacement or speed amplified by various types of amplification devices exceeds its limit capacity and prematurely fails,so that the damper can not only play the role of damping energy.It also poses a greater security risk to the security of the structure.In summary,this paper designs and develops a new type of metal damper cam response amplifier(CRAD-MD,Cam Response Amplification Device of Metallic Dampers),on the basis of improving the utilization efficiency of the damper and amplifying the damping effect,avoiding The problem of damper failure due to displacement overrun.In this paper,the theoretical calculation formula derivation,pseudo-static test research and numerical simulation analysis of the proposed CRAD-MD are carried out,and the seismic design method of the corresponding damping system is given.The main research contents are as follows:1.CRAD-MD device development and theoretical formula derivation: The system summarizes the research status of metal dampers and response amplification devices at home and abroad,and improves the existing seismic fortification requirements of the energy dissipation system under the rare earthquake.CRAD-MD was designed and developed to solve the problems of the amplifying device and the energy-consuming device.The working mechanism of the device was deduced,the formula for calculating the restoring force of the device was deduced,and the displacement,speed and horizontal force of the screw were given.Magnification calculation formula.2.CRAD-MD pseudo-static test: According to the laboratory test conditions,the main body of the device and the metal damper were designed and processed.Using two kinds of test schemes,the CRAD-MD was subjected to pseudo-static test of multiple working conditions.Different loading methods were adopted,and the hysteresis curve of CRAD-MD was obtained by changing the loading amplitude,loading frequency and loading speed.The analytical test results reveal the variation of the mechanical properties of the device.3.CRAD-MD single degree of freedom system seismic response analysis: single degree of freedom uncontrolled system(referred to as SDOF),single degree of freedom structure installation CRAD-MD system(referred to as CRAD-MD single degree of freedom system)and single degree of freedom structure installation The traditional metal damper system(referred to as MD single degree of freedom system)carried out comparative analysis of seismic responses under multiple far-field and near-field earthquakes,including control effect analysis,hysteresis curve comparison,dissipative energy comparison,and response spectrum analysis.And the control effect analysis based on the same displacement verifies the effectiveness of CRAD-MD and lays a foundation for the engineering design and seismic design method of the device.4.Seismic design method of CRAD-MD energy dissipation system: theoretically deduced the theoretical calculation formula of CRAD-MD hysteretic energy consumption.Using the theorem of energy conservation,the method of determining CRAD-MD design parameters is given and analyzed.The seismic design method of the shock absorption system is proposed,which provides a scientific basis for the engineering application of CRAD-MD and the preparation of corresponding specifications.