Research On Seismic Behavior Of Precast Prestressed Concrete Frames With External Energy Dissipater

With the development of building industrialization,the prefabricated building gradually rises.The precast prestressed concrete structure,as a kind of prefabricated building structure,has been proved to have excellent seismic performance by a large number of studies,among which the connection of prefabricated components as a key technology affecting the structural performance has been studied by many scholars at home and abroad.In the domestic research on the prestressed hybrid connection,the energy dissipating member mostly adopts the form of the built-in energy dissipating low carbon steel bar,and the external energy dissipating device is seldom studied.The "Plug and Play" energy dissipator in the us PRESSS research project has been tested and proved to have good energy dissipation performance,which has the advantages of low damage and self-resetting in the prefabricated prestressed frame-shear wall hybrid system.There are few researches on this structure in China,so we have a limited understanding of the force and energy dissipation performance of external replaceable energy dissipators,so it is necessary to conduct a more comprehensive study.This paper introduces the system to study the precast prestressed concrete frame structure with external replaceable energy dissipator.In this paper,the seismic performance of two precast prestressed concrete frame structures under low cyclic repeated load tests is analyzed,and the influence of various indexes on the seismic performance of hybrid connected frame structures is compared.The experimental results show that the precast prestressed concrete frame with external energy dissipators has good energy dissipation capacity and ductility,strong selfreduction capacity and small residual deformation,and the structure with symmetric energy dissipators has stronger overall stiffness and deformation resistance than the structure with asymmetric energy dissipators.Compares the experiment and simulation hysteresis curve through numerical simulation,the installation position of energy dissipator and diameter of parameters are analyzed,the results show that the energy dissipator installation height and end diameter has more obvious influence on bearing capacity of structure,the external energy dissipation is more effective than internal energy dissipation,the structure,to the extent permitted by increasing energy dissipator installation height or diameter to improve the bearing capacity of structure.The mechanism of the frame joint is studied.According to the stress analysis,the recommended formula for checking the horizontal shear bearing capacity of the core area of the joint is given.The shear bearing capacity of the core area of the joint is checked,and the bending bearing capacity and shear bearing capacity of the beam section are checked.The results show that the shear capacity of the joint core area is greatly improved under the condition of vertical and horizontal compression,and the beam is mainly damaged by bending,which meets the design requirements of strong shear weak bending.