Abstract:The influence of buckling-restrained braces on building structure is not considered in the current methods of structural reinforcement with outriggers. The connection between the outrigger and the building structure is unstable, thus leading to poor seismic strengthening performance of the structure. Therefore, herein, the influence of buckling-restrained braces on the seismic strengthening performance of a building structure is analyzed in detail, and the seismic reinforcement scheme of the structure is designed. The buckling-restrained brace and the structure are fixed by the high-strength bolted joints through connecting steel plates. The influence of buckling-restrained braces on the seismic strengthening performance of a structure was studied. The study was based on the relationships among bracing deformation and story drift, bearing capacity, displacement-checking calculations of the buckling-restrained braced frame under frequent earthquakes, and the elasto-plastic displacement-checking calculation of the buckling-restrained brace under the influence of rare earthquakes. The experimental results showed that after adding a buckling-restraint brace to the structure, the ratio of the first period of torsion to the first period of translation was decreased by 0.14; the stiffness ratio of the masonry wall to the building structure in the X and Y direction was decreased by 6.9 and 8.0, respectively, and the maximum vertex displacement was reduced by 15.4 mm and 29.3 mm, respectively. This indicated that the seismic reinforcement performance of the structure was greatly improved.
