Theoretical And Experimental Research Of Multiple Pounding Tuned Rotary Mass Damper

In this thesis,based on the pounding tuned rotary mass damper(PTRMD)based on hollow floor is proposed by the research group(TRMD,PTRMD),using a large number of cavities distributed in the hollow floor system,combining the rolling ball type with the currently widely used hollow floor structure system.When prefabricated in the factory,the tuned rotary mass damper is placed in the cavity,which can form a distributed multiple tuned rotary mass damper device(MTRMD,MPTRMD)that does not affect the function of the structure and is harmonious and unified with the building form.This type of device has the advantages of simple structure of TRMD,no need of springs and damping elements,low maintenance costs,and the advantages of strong collision damper robustness and control frequency bandwidth.In order to solve the problem of structural shock absorption control,a set of integrated and feasible solutions is provided.Firstly,the device model of MTRMD is introduced,the differential equation of motion of MTRMD in multi-degree-of-freedom system is deduced in detail,and it is applied to high-rise buildings.According to the vibration mode control,single-mode and multi-mode control structure schemes are proposed to optimize each scheme Based on the optimal friction coefficient,the vibration damping performance of each scheme and its robustness in structural frequency imbalance are studied.The results of the study show that the STRMD and MTRMD control schemes have equivalent damping effects on the displacement and root mean square of the high-rise buildings,and are superior to DMTRMD.However,the DMTRMD control scheme has a better damping effect on the interlayer displacement,acceleration,root mean square displacement,and root mean square acceleration of the structure.In the case of structural frequency offset,the robustness of DMTRMD is better than the other two control schemes,and the control frequency band is wider.Then add viscoelastic limit device on the basis of MTRMD,use Hertz collision model to simulate,and study its damping performance.PTRMD and TRMD have the same shock absorption law.Compared with the three control schemes of TRMD,the three control schemes that introduce a collision mechanism have better suppression effects on the maximum displacement and acceleration response.Poor,but not much different.The stiffness of the structure is reduced,and the damping effect of the two is not much different.The stiffness of the structure becomes larger,the three control effects introduced by the collision mechanism are better,and the robustness is better.Finally,a four-story frame model was designed with viscoelastic PTRMD added to the top two layers to study its vibration damping performance under free vibration and seismic excitation,and to compare the vibration damping performance of PTMRD with viscoelastic collision and rigid collision.The results show that PTRMD achieves good damping effect under both free vibration conditions and seismic wave excitation conditions,of which the displacement root mean square damping effect of response energy damping is the most obvious.Compared with the PTMRD of rigid collision,the viscoelastic collision can reduce the collision force and reduce the noise generated by the collision.The use of softer and high recovery coefficient viscoelastic materials can improve the shock absorption performance of viscoelastic collision PTRMD...