The Stiffness Of Steel-concrete Composite Truss Node

As a new connection in the field of architecture, steel-concrete composite truss node has good mechanical properties, low economic cost and a more harmonious beauty. However, because of the influence of the behavior of joints and various complicated geometric shape, less effort about joint’s deformation mechanism and translational stiffness have been spent in studying in this field. It has great theoretical significance and obvious value for finite element analysis of external joint and ear-plate joint.On the basis of the exsiting scale model test, this dissertation has done research about the joint’s deformation mechanism and translational stiffness with FEA software ABAQUS.Through research, the author makes conclusions as following:(1)General software ABAQUS is employed to do numerical simulation on the two types of nodes. Then the failure mode of nodes has been researched based on the original model.(2)The deformation mechanism of nodes have been Investigated deeply. It includes that the combinational deformation of concrete and gusset plates, the compressive and tensile deformation of Built-in reinforced, the Shear deformation deformation of the Shear reinforcement, the compressive and tensile and bending deformation of the ventral pole.(3)The stiffness of chord in compression, gusset plates in shear, ventral pole in compression and tnesion are given. A method has been developed for predicting the initial translational stiffness of two types of nodes by the component method.(4) Parameter analysis is carried out to research joints’translational stiffness with different intensity of concrete, reinforcement ratio, shear connectors’diameter, thickness of gusset plates and ventral pole.