Theoretical And Experimental Research Of RC Beam-circular Tubed Steel Reinforced Concrete (SRC) Subject To Centric Axial Loads

With the country urbanization advancement speeds up unceasingly,more and more farmlands have been alienated as a result of rapid urbanization in China.Therefore,it is challenging for us to increase the utilization of lands.The implying of the steel and concrete composite structure in buildings is an effective way to ease the problems of shortage of land resources.Beam-column joints are important part of the structure.The present researches on pre-stressed concrete-steel pole are mainly focused on the mechanical performance of pillars,while studies on node are very few,and it has not been deeply and systematically studied by now.The thesis focuses on the compression stress performance testing and finite element analysis of two new types of round pre-stressed steel-concrete column-RC beam node,Specific working content is as follows:(1)Taking the radius-thickness ratio of steel pipe,the steel ratio of core steel,the size of the steel pipe in the joint area as the control parameters,the author designed five new type of round pre-stressed steel-concrete column-RC beam node specimens and one round pre-stressed steel-concrete short column specimen,and then tested the axial compression stress performance tests of them,and the test preparation,test procedure,test phenomena and results were described and analyzed in detail.(2)With the aid of the finite element analysis software ABAQUS,the author modeled three-dimensional finite element models of six specimen of the experiment and made a nonlinear analysis on them.By comparing and analyzing the results from the ABAQUS and the actual experiment,this paper verifies the correctness and reliability of the finite element modeling method and parameter selection process.(3)Taking the radius-thickness ratio of steel pipe,the steel ratio of core steel,the thickness of ring beam,the steel ratio of ring beam,and the size of the steel pipe in the joint as the control parameters,the author modeled 23 finite element models which based on the tests and finite element analysis of the 6 specimen.And detailed analyzed the influencing rules of axial compression force performance on the round steel tube steel reinforced concrete column-RC beam node.