Seismic Performance Analysis Of Concrete Filled Steel Tubular Column-steel Beam-concrete Shear Wall Hybrid Structure

With the rapid development of the steel-concrete hybrid structure,the concrete filled steel tubular column-steel beam-shear wall structure is more and more used in high-rise buildings.According to relevant codes and suggestions of researchers,there are three kinds of forms between steel beam and shear wall,which are hinged,semi rigid and rigid,the seismic performance of the hybrid structure using three kinds of connections still ramain to be studied.This paper analyses the nonlinear dynamic response of concrete-filled steel tubular column-steel beam-shear wall structure with different connection stiffness under earthquakes in PERFORM-3D.The force and deformation laws of the hybrid structure under elastic and elastoplastic state when different connecting stiffness between steel beam and shear wall are studied.The main contents of this paper are as follows:(1)A concrete filled steel tubular column-steel beam-shear wall structure is designed according to an actual reinforced concrete frame-shear wall structure,and some seismic design suggestions by comparing total targets and inner forces of two structures are proposed.(2)Simulating the concrete filled steel tubular column in PERFORM-3D and comparing the simulated results with the test results to verify the accuracy of the simulation.(3)Establishing three models using hinged,semi-rigid,rigid connections in PERFORM-3D,and analysing the force and deformation laws of the hybrid structure under the action of multiple,rare and extremely rare earthquakes.The main conclusions of this paper are as follows:(1)Simulating the concrete filled steel tubular column in PERFORM-3D,it is key to use reasonable stress-strain relationship curve of concrete,so is to high strength concrete.(2)According to the definition of beam-column joint rotational stiffness in Euro code 3:Design of Steel Structures,connection types are divide.When the difference between actual moment and theoretical moment is less of 4.57%,the node is rigidly.When the difference is more than 77.37%,the node is hinged,in other cases,the node is semi-rigidly.(3)Considering the different connections between steel beam and shear wall by amplifying the bending linear stiffness of imbedded beam in the PERFORM-3D,the bending linear stiffness of the imbedded beam is related to the thickness of the shear wall and the angle between shear wall and steel beam.(4)Under the action of multiple earthquakes,the influence of the connection types between steel beam and shear wall on the shear force is great.Under the action of rare earthquakes,the connection types have the influence on plastic energy,but nothing to do with story shear force.Under the action of extremely rare earthquakes,there is no clear laws of composite shear force,shear force of wall and shear force of frame.(5)Under the action of earthquake,comparing with other connection types,when steel beam and shear wall is hinged,the story drift and inter-story drift ratio of the hybrid structure are maximum,the same with the share ratio of frame force.The main innovation points of this paper are as follows:(1)Analysing the effect of materials to the hysteretic curves of concrete-filled steel tubular column,the most suitable models of material simulating concrete-filled steel tubular column in PERFORM-3D is selected.(2)Consulting the division method of rigidity degree of beam-column joint in Euro code 3:Design of Steel Structures,the specific value of the bending linear stiffness of the imbedded beam is analyzed by amplifying the bending linear stiffness of imbedded beam to simulate the different connecting stiffness between steel beam and shear wall in PERFORM-3D.(3)The force and deformation laws of the hybrid structure under the action of earthquakes when the steel beam and shear wall adopted different connecting types is studied.