Experimental Study On Seismic Behavior Of A Bottom Reinforcement Anchored Precast Beam-to-column Connection With Key Slot

In recent years,China is vigorously promoting the modernization of the construction industry,green building and green construction,in order to accelerate the adjustment of construction industry and the improvement of technical level.Precast structure receives more and more attentions from the industry because of the high efficiency,the short construction period,saving resources,saving labor and other advantages.Among kinds of precast structures,precast concrete frame structure which is easiest to modularize and standardize in order to maximize the efficiency of assembly has a broad market prospects and application space.And in the frame structure,the joint is the hub of the beam and column,which determines the seismic behavior of the frame structure.Therefore,it is of great significance to find an efficient and reliable joint form of precast concrete frame structure.In this paper,the development and classification of precast concrete frame structure was briefly introduced,and on the basis of the existing precast concrete frame structure,the design idea of "large diameter and less quantity" was presented in order to further improve the assembly efficiency.Full-scale models of the Bottom Reinforcement Anchored Precast Beam-to-Column Connection with Key Slot were made and the research on its seismic behavior was given.The followings were the main contents:(1)Full-scale models were used for the comparison test to investigate the seismic behavior of a cast in place beam-column joint and two bottom reinforcement anchored precast beam-to-column joints with key slot under low-cycle reversed loading.The seismic behavior of the precast joints was given systematically by comparing the damage patterns,hysteresis curves,skeleton curves,strength,ductility,intensity degradation,stiffness degradation and energy dissipation capacity.(2)By using the finite element software ABAQUS,reliable finite element models were obtained by reasonable modeling and analysis.The calculated results were used to verify the experimental results.The impacts of parameters such as the reinforcement diameter and the concrete strength were studied by parametric analysis.(3)The performance-based seismic design method was introduced into the precast concrete frame structure.Combined with the test results,the performance evaluations of the three test specimens were given.(4)Based on the analysis of this experiment,some suggestions were given for the design and construction of the bottom reinforcement anchored precast beam-to-column joints with key slot,and the expectation of further and more comprehensive research in the future was put forward.In this paper,the seismic behavior of the bottom reinforcement anchored precast beam-to-column joints with key slot was analyzed in depth,which provides experimental data and theoretical basis for the further development and application of the joint form.