Experimental Study On Seismic Behavior Of Concrete Filled Square Steel Fube Column-H-Shaped Steel Beam Joints Under Low-Cycle Reversed Horizontal Load

In recent years, with the development of large-span structures and high-rise and theneed for the construction split-level, the conversion layer, device layer and undergroundparking structures, steel concrete structure with its good seismic performance gradually hasbeen widely used. Pei Zhen Xu and Akihiko Kono who concerned about how to give fullplay to the seismic performance of CFT columns proposed hybrid yield mechanism basedon the yielding of part of the column hinge,but the Related research is less. The Seismicdesign which based on the concrete-filled steel tubular frame with hybrid yield mechanismmust be able to ensure the integrity of the yield to avoid the layer damage. The node offramework which connected beams and columns is a key component to form a framestructure.It plays an important role in ensuring the stability of the entire structure. Thestress pattern of the node is more complex. It must be able to maintain the integrity andsafety when the structure yield to avoid the damage of Structure node and the layer damageespecially after the structure got into the elastic-plastic stage under the action of strongearthquake.In allusion to this problem, The author has made low cyclic loading tests on the squaresteel tube concrete column-H steel beam node. The specific work have the followingrespects:(1)In this paper,we took the node form, the strength ratio of beam and column, theaxial compression ratio and the rate of steel as the control parameters including steel.Andwe designed five nodes of Outside reinforcing ring of the square steel tube concretecolumn-H steel beam to study the ductility of the node, the strength, the stiffnessdegradation, the capacity of energy dissipation, the failure mechanism and the failurecharacteristics.(2)We have drawn the P hysteresis curve of the top of column,the M hysteresis curve of the beam end, the skeleton curve,and the stiffness degradation curveaccording to the test, and study the effect of each factor to the specimen in hysteresis energy consumption and accumulation injury. It provide the design basis for Yield integrityof Frame structure which based on the yielding of part of the column hinge(3) We have researched and analysed the plastic deformation property of Steel tubeconcrete beams and columns node according to the method of energy seismic design. Wealso have analysed the effect to Energy dissipation capacity of the Concrete-filled steel tubecolumn by calculating displacement ductility coefficient and cumulative plasticdeformation rate.And we have considered the effect of structure bearing capacity,displacement and energy accumulation consumption to make it more reasonable to evaluatestructure seismic performance.(4) We have imitated the square steel tube concrete column-H steel beam nodethrough the numerical calculation and finite element software ABAQUS to analyse thehysteretic performance under the action of reciprocating load. And we have compared thecalculation results with the test results.We have computed the ductility coefficient of thesquare steel tube concrete column-H steel beam node and analysed the effect of the axialcompression ratio,the rate of steel and the beam-column line stiffness ratio to the ductilitycoefficient.So we know the framework node working mechanism, the framework nodefailure mode,the stress distribution during the mechanical process and so on.