Analysis And Experimental Study Of The Effect Of Suspension Mass On Seismic Reduction Of Building Structure

It is an effective way to reduce the earthquake disaster by applying the reasonable seismic reduction measures to the structure. In this paper, the basic principle of applying the suspension mass damping system is discussed, the mechanical model and vibration differential equation of the multi frame structure are established, the inherent frequency of the six storey frame structure with the suspension mass is calculated, experimental modal analysis and seismic response of building structure test model before and after suspended mass are carried out. The finite element numerical simulation method is used to analyze the inherent characteristics and dynamic time history of the six storey frame and eighteen story shear wall structure before and after suspended mass. The effects of various parameters on the seismic performance of the structure are analyzed and discussed. Based on theoretical analysis, some conclusions are drawn that the engineering practical problems have reference value.Experimental study and numerical simulation results show that: On the structure of suspension mass vibration system basically does not change the natural frequency and natural mode of structure, but the first order modal damping ratio of the structure can be increased, and can effectively enhance the seismic capacity of the structure. It is effective to reduce the seismic response of the structure by applying the suspension mass damping system at the top of the structure. And selecting of appropriate suspension mass ratio and the natural frequency of the single pendulum is close to the natural frequency of the structure, the seismic damping effect of the structure is better. At this time, it is necessary to apply effective measures to the suspension quality node to avoid the excessive stress concentration.The theoretical calculation results, experimental results and finite element simulation results are also analyzed and compared, and the causes of error are discussed. In practical engineering, if only the low order natural frequency of the structure can be directly used to calculate the vibration differential equation, the method can be used to solve the problem in the process of finite element modeling.Research work in this paper can provide theoretical basis and reference for the application of suspension mass vibration reduction system in practical engineering.