Research On Hysteretic Characteristics Of Articulated Prestressed Fabricated Frame Element And Seismic Dynamic Performance Of Structure

Building industrialization technology has experienced a century of development,during which a variety of prestressed fabricated structure systems with continuously improved technical levels have emerged.Among them,the prestressed fabricated frame system is an efficient prestressed fabricated structure system developed in recent years.Compared with other fabricated structures,people considered the prestressed fabricated frame structure system to be of better seismic resistance,but the energy dissipation performance of this system is slightly insufficient.To this end,our research group proposes a new type of articulated prestressed fabricated beam-column connection,which uses the friction and slip mechanism to resist the shear force through the frictional force of the arc-shaped contact surface of the beam-column and provide energy dissipation under the action of rare earthquakes.The prestress given by the prestressed tendons can not only increase the normal stress of the beam-column contact surface and increase the interface friction,but also improve the unreasonable situation of the previous prestressed fabricated beam-column connection arrangement.Based on the research of the predecessors of the research group,this paper further fully considers the difference in hysteresis characteristics of the side and middle connections,and comprehensively studies the seismic response characteristics of the two types of prestressed fabricated frame elements including the side and middle elements,as well as the entire prestressed fabricated frame.The seismic performance of the system is as follows:（1）The finite element software ABAQUS was used to simulate the quasi-static reciprocating loading of 9 articulated prestressed frame elements and 9 articulated prestressed frame elements,and analyze the characteristics for these frame elements of the hysteresis curves as well as the skeleton curves,the energy dissipation performance and failure form provide a basis for the analysis of its seismic performance are also considered.The results show that the 9 articulated prestressed fabricated frame elements’ hysteresis curves are full and the energy dissipation capacity are pretty well.（2）Comprehensively consider the influence of the beam-column connection interface corbel curvature radius,interface prestress and beam-column member deflection deformation on the energy dissipation characteristics of the middle frame elements and the side frame elements,analyze the energy dissipation of the middle frame elements and the side frame elements similarities and differences in characteristics.The research results show that the energy dissipation capacity of these9 frame elements increase with the increase of the radius of curvature of the corbel and the interface prestress;the deflection of beam-column members have a certain influence on the energy dissipation characteristics of these 9 frame elements,but the effect is small;the energy dissipation value of the middle frame elements obviously larger than the side frame elements.（3）Using the finite element software SAP2000 to analyze the non-linear dynamic time history of 9 articulated prestressed fabricated frame structures and 1 cast-in-place frame structure under 7-degree frequent earthquakes and 7-degree rare earthquakes.The seismic response under the influence of the radius of curvature of the leg and the size of the interface prestress.The simulation results show that under the action of rare earthquakes and frequent earthquakes,the articulated prestressed fabricated frame structure produces slippage at the beam-column connections,and the plastic hinge only appears at the frame beam end.The hinged structure of the structure has a direct impact;the cast-in-place frame structure is seriously damaged under rare earthquakes,and a complete time history analysis cannot be performed.