Abstract
Concentrically braced frames have high stiffness, but show poor ductility in terms of the buckling of compressive member. Using the yielding dampers, of which the knee-joints are a part, can improve the seismic performance of steel frames. The bracing components in this system disperse energy by adhering to the knee joint and then yielding. The role of the bracing members is to provide rigidity, while the function of the knee member is to produce ductility similar to a yielding damper. These steel dampers are inactive and installed at the connection of brace to the frame. We obtained new results by combining Y-shaped braces with knee members. In this regard, three proposed bracing frame specimens were experimentally tested at the structural laboratory. Furthermore, all of the three laboratory specimens were modeled and validated in ABAQUS finite element software, and the results confirm the optimal performance of this seismic system along with energy absorption and appropriate behavior in the stability of this design. Moreover, it shows a good capacity for energy dissipation and the knee element starts the energy absorption process faster at lower frame displacements. It increases the durability of structure against lateral loads and less force is applied to the main elements of the structure. Using a knee bracing system can be a good alternative to the brace system in terms of its ease of replacement. Reasonable agreement with the experimental results is observed. The behavior of deformation-force hysteresis curves gives good results that, the experimental and parametric experiments showed that this system will have a lot of force adjustment.
Published Version
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