Study On Seismic Behavior Of Prefabricated Concrete Frame With Damped Infill Wall

The prefabricated concrete frame with damped infill wall structure is a new structural system proposed in recent years.In order to study the seismic performance and mechanism of prefabricated frame with damped infill wall structure,this dissertation carries out experimental research and finite element simulation of the structure.The main research contents and conclusions are as follows:(1)Low-cycle reciprocating tests were conducted on five-segment fabricated with damped infill wall frames,fabricated airframes,and fabricated ordinary wallboard frames,and the effects of different wallboards on the seismic performance of prefabricated frames were compared.The results show that the hysteresis curve of each specimen of the assembled damped infill wall is full,and the damping mechanism of each damped infill wall sample during load loading is obvious and feasible,and the overall stiffness of the structure is relieved,reducing the With regard to the constraining effect of the structure,the damped infill wall panel works according to a predetermined expectation and mechanism during the loading process,and participates in energy consumption during the loading of the load.The wall protection of the damped infill wall is better during the whole loading process.The destruction of ordinary wallboards is very serious,especially the vertical wallboards have fallen over a large area;the corners of ordinary wallboards are severely damaged by extrusion,so the superiority of damped infill wall is very obvious.(2)The finite element analysis software ABAQUS was used to simulate and analyze the stress characteristics and failure modes of the airframe and the two damped infill wall panels.The results show that the stress characteristics and failure modes of the air frame and the damped infill wall during the loading process are compared and analyzed by establishing a finite element model of the physical test piece.The simulation is in good agreement with the test and the damage is similar.Finite element analysis DWF1 fixed end of the wall joints at the plastic accumulation of large,serious damage to the wallboard;DWF2 due to strength is not enough individual wallboard unit corners have small wall plate peeling,The damped infill wall plate slips obviously during the loading process,and the energy dissipation mechanism is in line with expectations..(3)By designing 16 sets of different parameters to analyze the model of the damped infill wall,the influences and laws of different shock-absorbing layer friction coefficient,wallboard thickness,axial pressure ratio and number of different wall plates on the seismic performance of the damped infill walls were studied and compared.The results showed that: The friction coefficient of the damping layer increases,which increases the bearing capacity and initial stiffness of the damped infill wall structure of an assembled concrete frame under extreme displacement.In practical applications,the damping layer is recommended to use a damping layer material with a large friction coefficient.The increase in the thickness of the damped infill wall will increase the peak load of the prefabricated concrete frame damped infill wall structure to a certain extent,and has little effect on the initial stiffness and yield displacement.In practical applications,it can be based on actual conditions and various aspects of construction.The requirements determine the thickness of the damped infill wall.The axial compression ratio has a greater influence on the yield load,initial stiffness and ultimate displacement load of a fabricated concrete frame damped infill wall structure.The yield load,initial stiffness,and peak load tend to increase as the strength of the wallboard increases.The number of different wall plates has significantly improved the bearing capacity of damped infill wall plates of fabricated concrete frames.When the number of wallboards was two,the bearing capacity of three,four,and five wallboards increased by 5%,8.98%,and 13.11%,respectively.The increase in the number of wall blocks reduces the lateral stiffness of the structure.When the number of blocks is small,the wallboard has strong structural constraints.However,when the number of wallboards is too large,the integrity of the wallboard is poor,which is not conducive to the seismic performance of the structure.Therefore,it is appropriate to select three blocks in the frame.