| Recently, the tall buildings have been extensively constructed with mixed structural elements consisting of the steel reinforced concrete column and steel beam. This structural system uses each material, structural steel and concrete, to its best advantage. The bearing capacity, ductility and the seismic behavior of this structural system are better than realized using either material alone. However, very little information is available on the seismic behavior of the steel reinforced concrete column-steel beam joints, especially on the cylinder column-beam joints.In this paper, based on the test results of four steel reinforced concrete interior beam-column joint specimens composed of steel beam and steel reinforced concrete columns of circular section, the main properties of SRC interior beam-column joint under cyclic loading ,including the failure pattern, bearing capacity, ductility , the transfer mechanism and the influence of the axial compression ratio on the steel reinforced concrete cylinder column-steel beam joints and so on , are discussed. According to failure feature, the mechanism of SRC interior beam-column joint is analyzed and a formula for the shear strength of SRC interior beam-column joint is proposed, satisfactory agreement between the formula results and the experimental ones is,obtained.The ductility of SRC interior beam-column joint under cyclic loading is analysed, therefor, the experimental bases for practical utility are provided.The test results show that the joints between the steel reinforced concrete columns of circular section and steel beam have higher capacity, greater ductility and larger energy consuming property than conventional joints. |
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