Study On The Seismic Performance Of New Assembled Joints

As an effective way to realize industrialization of construction mode ofproduction，assembled monolithic reinforced concrete structure has the advantages ofthe precast reinforced structure and cast-in-situ concrete structure. In addition, this kindof structure is popularized by designers by its merits of quicker construction, bettereconomic, energy saving and environmental protection. The key of the assembledmonolithic reinforced concrete structure technology is beam-column connection. Inorder to make the better application of this type of structure in practical engineering,In this paper, mechanical properties of a new type of concrete-filled tubecolumn-prefabricated reinforced concrete beam jonts were researched under cyclicloading. The main concents of this thesis include:(1)12full-scale new type of concrete filled steel tubular column-prefabricatedreinforced concrete beam nodes and a full-scale frame model are produced, and theaxial compression ratio, angle of beam-column connections as parameters.The seismicbehavior of the test components were studied.(2) The load-displacement hysteretic curves, skeleton curves, strength degradation,stiffness degradation, ductility and energy dissipation capacity of the concrete filledsteel tubular column-reinforced concrete beam assembled joints are analysised. Thetest results show that: the hysteretic curves are full, seismic energy dissipation ability isgood, the strength and stiffness of nodes of degradation are not obvious, the principle of“strong column, weak beam”can be satisfied.(3) On the basis of assembly type nodes, the load-displacement hysteretic curves,skeleton curves, strength degradation, stiffness degradation, ductility and energydissipation capacity of the frame is analysised, under level of cyclic loading at the top ofthe frame. The test results show that: the hysteretic curves are full, seismic energydissipation ability is good, the strength and stiffness of frame of degradation are notobvious.(4) Using the finite element software ANSYS,and the axial compression ratio andsleeve position as parameters,this paper established the new type of nodes and a frame’sthree-dimensional nonlinear finite element analysis results, which were different fromthe experimental results,but the general trend are in good agreement.(5) Based on the test results of the analysis and finite element numerical simulationanalysis, the design reasonable proposals of the new concrete column-prefabricated reinforced concrete beam were put forward.