Study On The Seismic Behavior Of The Concrete Filled Tube Column To Beam With Penetration Bars

The concrete filled steel tube structure possesses advantages over either pure steel or concrete columns, and it is often used in high-rise and related seismic engineering practice.The superior performance of this structure,the concrete-filled steel tubular has been widely used.Now the performance of concrete filled steel tubular column and steel beam joints has been studied in depth, but the exploration and research of concrete filled tube column to beam with penetration bars is rare,its mechanical properties are need further analysis.Through comparison with experiments,we make use of ABAQUS to verify the accuracy of the finite element method and conduct the finite element analysis with full-scale simulation.We establish twenty F.E.models, for considering the behavior influence of cross-sectional area of reinforced(bar diameter),thickness of enforced loop plane, axial compression ratio and thickness of steel tubular.We analyse the hysteretic performance of structure, stress of steel and the node of penetration bars by finite element calculation results.The analytical result is: the hysteretic curve of Enforced inner Loop Joint is full and spindle in cyclic loading.Structure have not obviously stiffness degradation and Knead shrinkage phenomenon, structure have good seismic performance;The node parts of penetration bars should choose the appropriate reinforcement area,when the steel bar diameter16 mm to 20 mm,seismic performance can be effectively;The node parts of penetration bars must be set reinforcement and reinforced appropriate decorates the brackets on both sides of the upper and lower flange.In total,at least eight root, and it have good seismic performance;column end pressure of nodes bearing force and seismic performance of very small; with the increase of steel pipe wall thickness, variable on the stiffness of beam column joints, the bearing capacity of nodes increases, but the ductility of the structure to reduce,which is not conducive to anti-seismic structure;when the concrete strength reaches a certain value component failure,so it should reasonable configuration in actual engineering.This paper deeply analyzes the seismic performance of the connection joint between theconcrete filled tube column to beam with penetration bars cyclic loading, the conclusion of the node for the theoretical research and engineering application has a certain reference value,laid a good foundation for further study.