| Passive energy dissipation technology uses supports,dampers and other energy dissipation devices in the structure,and uses bending,friction,elastoplastic deformation,etc.of the supports and dampers to dissipate seismic energy,thereby reducing the seismic response of the structure and protecting the main structure.As an important part of building seismic technology,dampers have been widely used in industrial and civil buildings around the world,and have achieved fruitful research results.Friction dampers,as a subtype of displacement dampers and metallic dampers,have the advantages of low cost,simple structure,easy installation and replacement,stable performance,and resistance to environmental temperature.Rotational friction damper is a kind of friction damper.Unlike traditional sliding friction damper,it is not limited by the range.It will not fail due to the range problem during rare earthquakes.It can effectively dissipate seismic energy and has broad application prospects.However,due to friction torque calculation methods,the relationship between the mechanical properties of friction plates that provide frictional resistance and damper torque,high-performance friction plate materials,and the optimal layout of dampers in building structures,there are still some issues that need to be resolved.The problem has affected the market promotion and application of this type of damper.In order to promote the market transformation of this type of damper,this research intends to use the combination of experiments and finite element analysis to carry out the following aspects of research work:Main research contents: 1st,the torque calculation formula of the rotational friction damper is obtained through theoretical derivation,and the torque calculation formula is further verified by using ABAQUS finite element software;2nd,the experimental research on the mechanical properties of the rotational friction damper is performed.During the test,the influence of the type of friction materials and the loading pattern of the friction plates on the mechanical properties of the rotational friction damper was mainly investigated,and the type of friction material most suitable for the friction damper was suggested.3rd,A novel rotational friction damper for steel frame structure is proposed.4th.Establish a steel frame model based on Open SEES analysis software,and perform dynamic time history analysis and optimize on a steel frame structure equipped with rotational friction dampers,and examine the mechanical properties of the rotational friction dampers and the shock absorption performance in the steel frame structure,to obtain the most reasonable design and connection of the dampers.The research results show that the frictional mechanical properties of the damper made of friction plates made of Q235 and Q345 B steel during the test are unstable,which is not conducive to the design of the friction damper.Therefore,this material is not considered an ideal friction plate material.But if the material can be pre-treated before used,such as prefriction,it can obtain relatively stable mechanical properties,and the bearing capacity of this damper has not decreased.,which can achieve the purpose of stabilizing frictional energy dissipation,which can be used as high-quality friction materials.The steel frame equipped with the rotational friction dampers has a structure drift angle drop of approximately 31% during frequent earthquakes and a structure drift angle drop of approximately 30% during rare earthquakes.Within limits.The damperhysteresis curve is full,which shows that the energy dissipation performance of the rotational friction damper is fully exerted during earthquakes,and the friction damper has a positive effect on reducing the seismic response of the structure... |
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