Study On Seismic Behavior Of T-shaped Prefabricated Shear Walls With Energy-dissipating Joint

In order to study the seismic performance of the prefabricated shear walls structure with energy-dissipating vertical joint,the design concept of "strong horizontal joint and weak vertical joint" is proposed.The horizontal joint is rigidly connected by cast-in-place or grouting sleeve.The wing wall and web wall are directly connected by dampers to form weak energy-dissipating vertical joint.Dampers dissipate energy under strong earthquakes and provide initial stiffness for the structure under tiny earthquakes.At present,there are few attempts to apply dampers to vertical joints of T-shaped shear walls,the existing theory and results can not be fully used for reference.Therefore,it is necessary to carry out relevant test and theoretical research.Through the experimental study,the seismic performance of T-shaped prefabricated shear wall specimens and reinforced specimens are analyzed,which provide experimental and theoretical basis for the research on prefabricated shear wall.The main work and results are as follows:1)Three T-shaped prefabricated shear wall specimens with energy-dissipating vertical joint were designed.Firstly,Low-cycle reciprocating load test were carried on the original specimen until the specimen was destroyed;secondly,the damaged specimen was reinforced with carbon fiber cloth,and then the reinforced specimen was subjected to low-cycle reciprocating load test.The variation parameters of the shear wall specimens were the axial compression ratio,the concrete strength and the reinforcement ratio of the steel bars.The hysteresis curve,skeleton curve,stiffness degradation curve,ductility and energy-dissipating capacity of the specimen are analyzed.2)Under the condition of constant axial compression ratio,with the increase of concrete strength and reinforcement ratio,the ultimate bearing capacity of the original vertical slit shear wall doubled,the initial equivalent stiffness was basically the same,and the residual stiffness after unloading was about 70%;with the increase of axial compression ratio,the shear walls with high axial compression ratio had cracking earlier.When the loading displacement reached 60 mm,the bearing capacity of the two specimens was basically the same,the maximum increase of initial stiffness is more than doubled,and the residual stiffness increased by about 20% after unloading.3)Compared with the original specimens,the bearing capacity and stiffness of each loading stage of the reinforced specimens were reduced.Due to the asymmetry of T-shaped shear wall,the negative bearing capacity was higher than the positive bearing capacity;when the peak displacement angle reaches or exceeded 1.5 times of the maximum elastic-plastic displacement angle,the ultimate bearing capacity and residual stiffness of the specimens are basically the same.4)The displacement ductility coefficient of T-shaped prefabricated shear walls with energy-dissipating vertical joint was close to or more than 3,which reflected the good deformation ability of the specimens.The dampers have good energy dissipation and connection performance;The results show that the equivalent viscous damping coefficient increases with the increase of loading displacement,and the specimen shows good energydissipating capacity.Figure 30;Table 10;Reference 70...