Research On The Seismic Properties Of Fabricated Self-Reset Artificial Plastic Hinge

With the arrival of the "dual-carbon" era,prefabricated construction has ushered in new opportunities and development.Prefabricated construction is an environmentally-friendly,energy-saving,and sustainable form of structure,but the existing prefabricated node connectivity performance is poor,and seismic performance needs improvement.To promote the development of prefabricated nodes and improve the seismic performance of prefabricated buildings,this paper proposes a self-restoring,artificially controllable plastic hinge node design method based on the superelastic effect and shape memory effect of nickel-titanium memory alloy materials.ABAQUS finite element software is used to analyze the seismic performance of prefabricated self-restoring,artificially controllable plastic hinge beam-column joints under low-cycle displacement.The main research content of this paper is as follows:(1)Using the ABAQUS finite element software,finite element simulations are conducted on the existing prefabricated artificial plastic hinge beam-column joint and Nickel-Titanium Shape Memory Alloy superelastic constitutive model.By comparing and analyzing the gap between the finite element results and the experimental results,the reliability of this type of finite element research problem is verified.(2)An optimization proposal is put forward for the traditional artificial controllable plastic hinge.By combining the superelastic effect and shape memory effect of SMA(Shape Memory Alloy)bars,the traditional energy dissipation thin plate is replaced by SMA bars.ABAQUS finite element software is used to analyze the hysteresis performance of prefabricated self-restoring artificial controllable plastic hinge beam-column joints and traditional prefabricated artificial controllable plastic hinge beam-column joints under cyclic displacement.The results show that compared with the traditional artificial controllable plastic hinge,the self-restoring artificial controllable plastic hinge(SACPH)has a maximum increase in bearing capacity of 25.34%,double the structural ductility,sustainable energy dissipation,and significantly improves the seismic performance of the structure.(3)The ABAQUS finite element software is used to analyze and establish a detailed model of SACPH,and explores the effects of parameters such as energy dissipation bar diameter,energy dissipation bar length,and energy dissipation bar material properties on the seismic performance of the prefabricated self-restoring artificial controllable plastic hinge under cyclic displacement.Suggested ranges of each parameter are provided based on comprehensive consideration,with an energy dissipation bar diameter of 18mm～22mm,an energy dissipation bar length of 200mm～250mm,and SMA material recommended as the energy dissipation bar material.(4)Using the component method,a deformation calculation model and formula of the node are provided,taking into account that the connection system and energy dissipation system of the SACPH node are a bend-shear decoupled node device.The formulas for calculating the bending capacity of the energy dissipation bar and the shear capacity of the connection system are given.Based on relevant specifications,the node is constructed and designed,providing theoretical basis for node design.