Abstract
In order to improve the energy dissipation capacity and ductility of steel frame structures, and simultaneously to achieve damage control of the system and quick resilience of structural function after seismic events, a dissipative bolted joint for steel frame with replaceable low yield point steel (LYP) connected components was proposed, based on the concept of combining high-performance material and high-performance structure system. The detailed nonlinear numerical model of full-bolted joints was established, which was validated against the existing cyclic tests. Then, the modeling framework was employed to explore the seismic behavior and working mechanism of this joint. Together, the parametric analyses were implemented to evaluate the influence of key factors on performances of the joint, and the relationship between the impact factors and the fuse effect of LYP connected components was quantified. Finally, the design method and design procedure of this joint were suggested. These analyses demonstrated that: the well-designed replaceable LYP connected components were able to concentrate plasticity and damage, to dissipate large amounts of energy, and to give full play to the role of fuse, which effectively controlled the position of plastic hinge, protected the main structural elements from undesirable damage and realized repairable function after earthquakes. The actual bearing capacity coefficient determined the effectiveness of the ductile fuse. With the increase of this coefficient, in case of its value above 1.0, the damage and plasticity concentration positions would be undesirably shifted from the connected components to the main frame, revealing the fuse effect would be gradually lessened to failure. Consequently, the design resistance capacity coefficient was required to be less than the critical value, which ensured that the joint was capable of developing sufficient fuse effect until achieving the rotation of the minimum ductility requirement.
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