| Steel Reinforced Concrete (SRC) structure is mostly used in multi-stories and high buildings. It exploits to the fully steel structure's and reinforced concrete structure's favorable conditions and makes good use of materials. As it is especially significant to deal with joint's connection in multi-stories and high buildings, so in order to ensure bearing capacity, ductility and seismic behavior of joints, which strengthen the core by calculation and constructional measure generally.Joint with dog-bone type weakening, which flange on the beam near the core area is weakened like a dog-bone to cut down its bending strength, is a modern type used in steel structure. Under earthquake this kind of joint can make certain that the plastic hinge not appear on the interior area, but on the weakening beam with good ductility, so as to protect the core.In this paper, the seismic behavior of interior joints with dog-stone type weakening at the ends of beam of the steel reinforced concrete (SRC) frame is studied. The tests of them under cyclic loading are carried out, which are analyzed by the ANSYS software. As well as the paper discusses calculation formulary of dog-bone connection parameters and design steps of dog-bone SRC connection. Dog-bone type joints'failure pattern, bearing capacity, hysteretic property, ductility, stiffness degradation, energy dissipation capacity, rotation of plastic hinge regions and shear deformation of joint core is investigated. The mechanics behavior of core and the stress transfer mechanism are also researched.The results of this paper indicate:(1) The seismic performance, including the ductility and energy dissipation capacity of the SRC joint with dog-bone type weakening is clearly superior to that of the ordinary SRC joint.(2) the results of nonlinear finite element method program are comparatively closed to the value of experiments, which shows the modals are reasonable.
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