Research On Seismic Performance And Design Method Of Ring Beam Joint With RC Beam And Circular Tubed Steel Reinforced Concrete Column

As a new type of combined structure,tubed steel reinforced concrete structure is evolved from the traditional tubed reinforced concrete structure,the configuration of the rebar and section steel in the concrete effectively improve the bending and shear capacity of the structure,so the application prospect of this structure is very broad.In recent years,domestic and foreign scholars’ research on this type of new structure mainly concentrate on the axial compression performance of typical members,while the theoretical research system has not been targeted at typical beam-column joints structures.The research team had designed and completed pseudostatic loading tests on ring beam joint with RC beam and circular tubed steel reinforced concrete column in the early stage.The work in this paper based on on the experiment that the previous research group had completed.Firstly,preliminary summarizng the result of tests,and then using ABAQUS software to establish analysis models,and the data obtained from the test and model analysis were combined to deeply analyze the joints.The contents are as follows:(1)Two finite element analysis model were established by using ABAQUS finite element analysis software for two RCTSRC joints,and nonlinear finite element analysis were performed.Comparing the test failure process,load-displacement hysteresis curve and other results between finite element analysis model and test conditions to verify the accuracy and applicability of the model.At the same time,in order to clarify the internal force mechanism of the joints proposed in this paper,the stress and strain of the section steel,rebar inside the joints were preliminary analyzed.(2)Conducting the analysis of joints parameter changes that cannot be performed due to the limit of experimental conditions,using ABAQUS software to perform parameter analysis on RCTSRC joints based on 6 parameters with significantly influence.After research and analysis,the recommended values for the parameters of the joints proposed in this paper were: RH-2 joints’ limit of axial pressure ratio was 0.24.The limit of round steel tube diameter-thickness ratio was 63.3.The concrete ring beam width was not less than 140 mm.The limit of beam-column stiffness ratio was 1.151.When considering the economic benefits,it is recommended to use C60 for the concrete strength,and the steel content steel should be controlled between 0.025 and 0.043.(3)The calculation method of the horizontal bearing capacity at the top of the column,the bending capacity of the joints and the shearing capacity of the core area were established by linear and non-linear mathematical calculations based on data from tests and parameter changing analysis.In order to make the formula have certain applicability,on the basis of the calculation method applicable to each single parameter,the six parameters affecting the RCTSRC joints are unified,and the calculation method applicable to the six parameters was established.After comparison,the maximum error of the formula calculation results does not exceed 10% of the experimental and finite element data.