Research On Seismic Performance Of Core Beam Reinforced Prefabricated Concrete Frame Joints

With the continuous development of the national economy,whether from national policies or environmental protection,it is necessary to vigorously develop prefabricated buildings.In the assembled structure system,the concrete frame structure has a reasonable force transmission path and good seismic performance,so it has broad application prospects.However,the prefabricated concrete frame nodes usually have problems such as complex structure and difficult to build,integral prefabricated and difficult to transport,high cost and difficult to promote.Therefore,it is of great significance to develop a prefabricated concrete frame node that is safe and convenient,shortens the construction period,and can be widely applied.This article summarized the seismic performance of precast concrete frame joints at home and abroad.On the basis of existing research of steel strand anchored beam-column joints,an improved core beam reinforced prefabricated frame joint was proposed and an experimental study on seismic performance was carried out The main content of the paper included the following aspects:(1)ABAQUS software was used to establish a refined model of steel strand anchored nodes,the process of establishing a refined node model was introduced in detail,and then the hysteretic performance of the node was analyzed and compared with the test results.Based on this model parametric analysis of the nodes was used to provide theoretical bases for further improvement of the nodes.(2)Based on the research of steel strand anchored prefabricated joints,this article proposed an improved joint-core beam reinforced prefabricated joint and experimental design.The material properties of the test components were tested to provide basis for parameter values for subsequent finite element analysis.This paper introduced the manufacture process,loading device,loading system and measurement scheme of the test components.(3)Carried out a low-cycle repeated load test on a core beam reinforced prefabricated node and a cast-in-place contrast node to analyze the test process and failure morphology.In addition,the seismic performance of the new prefabricated joint was studied comprehensively by comparing and analyzing the hysteretic curve,skeleton curve,strength,stiffness,deformation capacity,energy consumption and other aspects.(4)ABAQUS software was used to model and analyze the core beam node,and the simulation results were basically consistent with the test results,which verified that the model established in this paper can simulate the seismic performance of the joint more accurately.Through the above content,the seismic performance of the steel strand anchored node and the core beam reinforced prefabricated assembled node was studied in depth,which provided a certain experimental and theoretical basis for the popularization and application of the node,and also summarized the node questions to be further explored.