The Study On Seismic Behavior Of Prefabricated Frame Column Joints Under Bolted Joints

Compared with traditional cast-in-place buildings,prefabricated buildings have high-efficiency,high-precision,high-quality construction advantages,and can greatly reduce on-site wet work workload and improve on-site construction conditions,thus achieving good economic and social benefits.However,there are some mechanical defects in the prefabricated building,such as the weakest joint connection area which is the key to affect the seismic performance of the whole structure.Improper handling will affect the normal use of the entire structure.The assembled monolithic concrete column joints studied in this paper adopt the steel plate hoop bolt connection method and are equipped with high-strength spiral hoop steel bars,which can satisfy the reliability of the joint connection to a certain extent,and further improve the overall bearing capacity and seismic performance of the structure.In this paper,the finite element analysis software ABAQUS is used to numerically simulate the joints of the steel plate hoop bolt connection flat joints,and the analysis results are compared with the test results to verify the correctness and feasibility of the modeling method.Secondly,based on the integration of many connection methods,the cogging connection and the bolt connection are combined to establish the force model of the steel plate hoop bolt connection single tooth assembly column and the steel plate hoop bolt connection double tooth assembly column,and the finite element is carried out.analysis.The results show that compared with the flat-end assembly column,the hysteresis curve of the single-tooth assembly co(?)more,the stiffness degradation is slower,and both have better energy dissipation capacity and seismic performance;The hysteresis curve,skeleton curve,energy dissipation capacity and stiffness of the single-tooth assembly column and the double-tooth assembly column show that the hysteresis curve of the double-tooth assembly column is fuller,the energy consumption is stronger,and the stiffness is degraded compared to the single-tooth assembly column.Slower and better seismic performance.Finally,based on the finite element analysis of the relevant parameters(axial pressure ratio,steel hoop thickness,and steel plate hoop length)of the single-tooth assembly column joint,the steel plate hoop bolt connection of the double-tooth assembly column is changed to the steel plate bolt connection method.The seismic performance of the double-tooth assembly column under steel plate connection is studied.Concluded as follow:(1)When the axial compression ratio increases within a certain range,the development of the oblique crack in the core zone can be suppressed to a certain extent,from the increase of the bearing capacity of the single-tooth assembly column,the cumulative energy consumption increases,the stiffness degradation is slow,and the assembly column is made.Increased energy consumption;(2)As the thickness of the steel hoop increases,the energy consumption capacity of the single-tooth assembly column increases,but the rate of stiffness degradation increases slightly;(3)As the length of the steel hoop increases,the stiffness of the single-tooth assembly column increases,but the stiffness deteriorates faster during the loading stage.Moderate steel hoop lengths have better energy dissipation and slower stiffness degradation.(4)Compared with the double-tooth assembly column connected with the steel plate hoop,the bearing capacity and energy consumption capacity of the steel plate connecting double-tooth assembly column are slightly lower,the stiffness degradation is faster,and the seismic performance is relatively poor.(5)Compared with the X-direction loading,when the horizontal displacement of the steel plate-connected double-tooth assembly column is loaded in the Y direction,the failure mode changes significantly and the seismic performance is improved.