Design Of SMA-Composite Friction Energy Dissipation Device And Study On Its Seismic Absorption Performance

Traditional seismic structures usually use the plastic deformation of the structure to consume seismic energy.However,after the structure undergoes a strong earthquake,there will be large inelastic deformation and large residual displacement,which makes it difficult to repair the structure after the earthquake.Or the structure cannot continue to be used normally after the earthquake.Although the application of energy-consuming and shock-absorbing devices in building structures can reduce earthquake damage to a certain extent and protect the main structure,the residual displacement of the device after the earthquake is too large,and the problem that it is not convenient to repair and replace the device still exists.The newly proposed " earthquake resilient structure " provides new ideas for the research and development of seismic methods of building structures,and self-centering energy-consuming devices are also part of this system.As a new type of smart material with both energy consumption and self-centering capability,shape memory alloy has a good prospect in the field of self-centering energy consumption devices.At present,a large number of SMA self-centering energy dissipation devices have been developed by scholars at home and abroad,but devices that only use SMA as energy-consuming materials have the problems of insufficient energy consumption and limited seismic performance;while SMA composite energy dissipation devices have the problems of complex construction and inconvenient installation and replacement.In this context,this paper combines the advantages of SMA materials and friction dampers to propose a new type of SMA self-centering composite friction energy dissipation device and uses numerical simulation methods to analyze the mechanical properties and damping effects of the device.The main research work of this paper is as follows:(1)The basic properties and constitutive model of SMA are introduced in detail,and the constitutive model of shape memory alloy embedded in ABAQUS is used to simulate the stress-strain curve and SMA under different loading amplitudes,loading rates,and cross-sectional dimensions.The stress-strain curve of the wire after axial stretching is compared with the experimental results in the literature.The results show that the constitutive model of the shape memory alloy embedded in ABAQUS can more accurately simulate the superelastic constitutive relationship of the SMA material,and the numerical simulation results are basically consistent with the experimental results in the literature.(2)Taking advantage of the superelastic properties of SMA and the characteristics of stable energy consumption of the friction device,a new type of self-centering composite friction energy consumption device of SMA is designed,and its design idea,basic structure,working principle,and functional characteristics are explained.(3)Numerical simulation research on SMA self-centering composite friction energy dissipation device.A physical model of the device was established in the ABAQUS finite element software,and the hysteretic performance of the energy dissipation device under different bolt preloads,different displacement amplitudes,and different numbers of SMAs is simulated and analyzed.The results show that the hysteresis curve of the device is full and the energy consumption capacity is stable;with the increase of the bolt pre-tightening force,displacement amplitude and the number of SMA tows,the energy consumption capacity gradually increases.(4)The simplified connection element modeling of the SMA composite friction energy dissipation device is carried out,and the two numerical simulation methods of the solid model and the simplified model are compared and analyzed in terms of calculation accuracy and calculation efficiency.The results show that the simplified model has advantages in calculation efficiency and calculation cost compared with the solid model.At the same time,the error between the calculation results and the solid model is relatively small,indicating that the simplified model has a better fitting effect and can be used for structural seismic analysis.(5)The pure steel frame model,the pure friction device steel frame model,and the SMA self-centering composite friction energy dissipation device steel frame model are established in ABAQUS respectively,and the elastoplastic time history analysis of the three models under earthquake action is carried out to compare The influence of SMA self-centering composite friction energy dissipation device on the seismic performance of steel frame is analyzed.The results show that the device can effectively reduce the seismic response of the structure and improve the post-earthquake recovery capacity of structural and non-structural components.