Study On Seismic Performance Of Fabricated Frame-shear Wall Structure With Dry-type Energy Dissipatied Connectors

With the rapid development of China construction industrialization and the vigorous promotion of green buildings,prefabricated concrete structures are widely used in practical projects.Prefabricated concrete structures mainly include prefabricated frame structures,prefabricated shear wall structures,and prefabricated frame-shear wall structures.The quality and performance of prefabricated concrete structures are mainly affected by the joint connection construction process.The joint connections of fabricated concrete structure are mainly divided into two types: dry connection and wet connection.Dry connection mainly includes bolt connection,welding,unbonded post-tensioning and so on.Wet connection mainly includes grouting sleeve connection,grout anchor connection,and cast-in-place concrete with reserved steel bars.At present,there are few studies on the connection method and seismic performance of prefabricated frame-shear wall structures,mainly because there are many different types of members,and the joint processing at the joints is relatively complicated.The vertical joints of prefabricated components in prefabricated frame-shear wall structures mainly include wall-wall and wall-column connections.Wet connection is usually adopted,the construction method of reserving the post-pouring belt and rebar reinforcement,and then rebar binding and post-concreting.This method tends to cause densely arranged steel bars at vertical joints,increases the possibility of steel bar collision,and brings certain difficulties to the vibration of post-cast concrete,which in turn affects the construction quality and mechanical performance of the structure.Based on this,this paper proposes to use mild steel dampers as dry energy-consuming connectors to apply to the joints of prefabricated concrete frame-shear wall structure wall-wall,wall-column vertical joints instead of rebar reinforcement and post-cast concrete The wet connection method not only simplifies the construction method of the structure,improves the construction efficiency,but also improves the energy consumption capacity of the structure.The proposed assembly structure is studied.The main contents of this paper are as follows:(1)It is proposed to use mild steel dampers as dry energy-dissipating connectors for vertical joints of fabricated frame-shear structures,that is,wall-wall and wall-column joint connections;Based on the ABAQUS finite element software platform,a new finite element model of the proposed prefabricated frame-shear wall energy dissipation structure was established and compared with the cast-in-place model to verify the use of damper connectors for wall-wall and feasibility of wall-column vertical joints.(2)The effects of the number of dampers,the width of the reserved vertical seam and the location of the reserved vertical seam on the mechanical performance and damage characteristics of the fabricated structure were studied.The results show that the number of dampers,the width of the reserved vertical joints,and the position of the reserved vertical joints have certain effects on the stiffness,bearing capacity and ductility of the structure.(3)In order to adapt to the analysis of complex structural model,a simplified simulation method of the damper connector is proposed.The connection unit is used to simulate the damper connector,and a simplified analysis model of the overall structure of the energy dissipating structure of fabricated frame-shear wall is established.The modal analysis and nonlinear seismic response analysis verify the accuracy and effectiveness of the proposed simplified analysis model.(4)Based on the proposed simplified model of the overall structure of the fabricated frame-shear energy-consuming structure,the energy-absorbing and energy-absorbing characteristics of the structure were studied and compared with the cast-in-situ structure.The research results show that the mild steel damper connector can improve the energy dissipation capacity of the structure,the structural displacement response is significantly reduced,and structural damage is reduced.The energy dissipation effect of the wall-column connection model is more effective than the wall-wall connection model.Significantly.