Abstract:
In order to improve the ductility and energy dissipation capacity of traditional steel frame-tube structures, proposed is an earthquake-resilient steel frame-tube structure with bolted splice-plate shear links (FTS-SRSL). FTS-SRSL combines the advantages of replaceable shear links and steel frame tube structure, which has a good seismic performance. A cycle loading test was performed on a 2/3-scale single-storey single-span FTS-SRSL sub-structure. Test results demonstrated that the sub-structure of FTS-SRSL possesses a great seismic performance, and structural damage is concentrated in shear links which can be replaced. On the basic of the test, the length ratio of shear links, the spacing of web stiffeners of shear links, the diameter of bolt, the thickness of flange splice-plate and web splice-plate were concerned as parameters to investigate the hysteretic behaviors of FTS-SRSL. The finite element analysis software ABAQUS was used to establish finite element models (FEMs) of 15 full-scale FTS-SRSL sub-structure with single-storey and single-span. The global seismic response, bearing capacity, stiffness, energy dissipation, and plastic deformation ability of each FEM were evaluated. The finite analysis results demonstrated that changing the length ratio of the shear links can significantly affect the bearing capacity and, stiffness and energy consumption of the FEMs. Based on the analysis of this paper, it is suggested that the length ratio of the shear links should be ranged within 0.73 to 1.09. The bearing capacity and energy consumption of the structure could be reduced without stiffeners. The spacing of the link web stiffeners had little effect on the bearing capacity, on the stiffness, and on the energy consumption of the structure. And it is suggested that: the spacing of link web stiffeners of FTS-SRSL should be ranged within
e/4 to
e/3(
e is the length of the shear links), and the spacing should follow the requirements in Code for Seismic Design of Buildings. The thickness of flange splice-plate and web splice-plate had no effect on the bearing capacity, on the stiffness and energy consumption of the structure. The diameter of bolt had little effect on the bearing capacity, on the stiffness and, on the energy consumption of the structure.