Model Test And Theoretical Analysis On The Vibration Absorbing Performance Of TRMD/PTRMD For Cavity Floor Structure

Structural vibration control technology provides a new way for the structure to resist earthquake and wind.It is a research hotspot in civil engineering,aerospace,automobile,machinery,military engineering and other fields.Specifically,in the field of civil engineering,the vibration control system reduces the dynamic response of the structure under the action of external excitation through appropriate design and installation,so as to reduce the possibility of structural damage under the action of catastrophic load,and finally achieve the harmony of economy,security and reliability.In recent ten years,the research field of structural vibration control has developed rapidly,and a series of important research progress and achievements have been developed in theory and engineering application.This topic will use the hollow floor system which is gradually widely used in project,combined with the quality of the typical damper in structural vibration control technology,the basic principle of damping energy consumption to develop a new kind of shocking absorber to reduce the structure vibration under seismic excitation,and its dynamic characteristics and damping mechanism will be studied by theory and experiment.This paper will set a spherical bottom prefabrication cavity component in floor structure,on this basis,two kinds of vibration control device have been developed according to the structure characteristics of the cavity,respectively are Tuned Rotary Mass Damper(TRMD)and Pounding Tuned Rotary Mass Damper(PTRMD).The calculation method of two kinds of devices in theory,damping performance,parameter analysis and shaking table test and other aspects of the system of further research.According to the Lagrange equation,the motion differential equation of TRMD system is established,and the dynamic response of TRMD controlled structure under external excitation is obtained by numerical simulation,and the damping performance of TRMD is discussed.Based on the Jankowski impact force model,the collision process between the small ball and the limit baffle was simulated to obtain the vibration control effect of the PTRMD on the controlled structure under deterministic excitation.The key parameters such as collision spacing,mass ratio and damper frequency were selected according to the device characteristics,and the parameter optimization analysis of the PTRMD system was carried out.The differential equations of motion of TRMD system and PTRMD system are obtained by using the acceleration energy equation.By comparing with Lagrange method,the feasibility of calculating TRMD system and PTRMD system by Appell method is verified.On this basis,the motion equation of mass damper of rolling ball with no collision mechanism in 3d coordinate system is calculated.The shaking table test results of the two dampers are analysed to provide a basis for the practical engineering application of TRMD system and PTRMD system from both theoretical and technical aspects.Monte carlo method was used to analyse the random vibration of TRMD and PTRMD systems to study the damping effect and structural reliability of the two devices under random excitation.