| The energy dissipation structure system of vibration damping floor is a passive vibration damping control system based on the principle of assembled stacked floor slabs and tuned mass dampers.The structure is equipped with high damping rubber(HDR)energy dissipation members between the upper and lower floors while keeping the original cross-sectional dimensions and reinforcement rate of the stacked floor slab unchanged.In this paper,the vibration control effect of the energy dissipation structural system of vibration damping floor slab is thoroughly studied by using theoretical analysis,experimental verification and finite element simulation,which mainly includes:(1)The dynamic response and energy transfer of the damped structure are analyzed based on the characteristics of the frequency response function with the single degree of freedom damping system as the research object.The influence of parameters such as mass ratio,frequency ratio and damping ratio on the damping effect of the structure is discussed,and the optimal parameter design method of the single degree of freedom damping system is proposed by using the fixed point theory.The differential equations of motion of the multi-degree-offreedom damping system were established,and the modal analysis method was used to decouple it into a single-degree-of-freedom system for solution,and the optimal design parameters of the multi-degree-of-freedom damping structure were obtained,and the design principles and process of this type of damping structure were summarized.(2)In order to study the mechanical performance of the energy dissipation device of the vibration damping floor slab,three different ratios of high damping rubber specimens were tested and analyzed by shear test method,and the influence law of loading frequency and strain amplitude on the mechanical performance parameters of high damping rubber was explored.The test results showed that the mechanical property parameters of the three high damping rubber materials were stable under different loading frequencies,while the mechanical property parameters showed large changes under different strain amplitudes.Therefore,this material was selected as the main material of the energy dissipation damping device.(3)In order to study the dynamic response of the energy dissipation structure of the damped floor under earthquake,a three-story demountable and assemblable single-bay,singlespan steel frame model was designed and fabricated,and the damped floor energy dissipation structure was set up in the model as a seismic damping measure.The modal control method is used to conduct real-time excitation tests on the steel frame model with different structural types,different excitation frequencies and different vibration control targets,and the acceleration and displacement are used as indicators to evaluate the damping effect.The test results show that:with the increase of loading frequency,the damping efficiency of the structure is first increased and then decreased;the closer the loading frequency is to the self-oscillation frequency of the structure,the better its damping effect;based on the vibration control target,the damping effect is better at the first-order vibration control,and the damping effect of the first floor is also better than the other floors.(4)To study the dynamic response characteristics of the damped floor slab energy dissipation structure under the earthquake,a numerical model was established by SAP2000 finite element software based on the experimental single-story steel frame model and the design parameters of the damped floor,and a nonlinear time-time analysis was performed under the excitation of seismic waves of three different intensities.The analysis results show that the damped floor dissipation structure can effectively reduce the seismic response of the structure and improve the seismic performance of the structure,and its damping effect is insensitive to the change of seismic intensities. |
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