Optimum Strength Ratio of Buckling-Restrained Braces as Hysteretic Energy Dissipation Devices Installed in R/C Frames

Abstract eng:
This paper focuses on the application of buckling-restrained braces (BRB) to reinforced concrete (R/C) framed structures in order to reduce the seismic damage in the main frame components. An attempt for a new direction in defining the mechanical properties of hysteretic dampers is evaluated in which the deformation of dampers is directly controlled. The range of strength levels required to be given to the dampers to minimize the damage in the main frame is investigated. A parametric study was carried out on 10-story R/C building structure with damper strength ratio β and yield drift ratio ν as main parameters. Equivalent single-degree-of-freedom (ESDOF) model is also discussed. Based on the numerical results it has been concluded that there is not a unique value that minimizes the damage in the main frame; on the contrary, there is an applicable range. The range is found to be dependent on the seismic input level and time-dependent characteristics of ground motions. Earthquake response shows the significant improvement of the structural performance and the implication of the yield drift ratio on the reduction of maximum floor displacements and damage in the main frame. ESDOF model demonstrated to provide sufficiently accurate estimations of floor displacements.

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