| With the development of the city and the improvement of people's aesthetic ideas, a large number of plan-asymmetric and complicated irregular buildings are built recently. Although the city's architectural form is enriched and the urban landscape is beautified, these irregular structures are detrimental to the seismic. China is an earthquake active country, seismic zoning is broad and scattered, and earthquakes are frequent and strong. Because the traditional design method of torsional has inevitable limitations, with the development of the seismic energy dissipative technique, it can provide a new path to control the tosional effect of the asymmetric-plan structure.An eccentric steel frame was compared with three kinds of control plans with buckling-restrained braces. ETABS, a FEA software, is used to conduct the finite element analysis of the structure, including modal analysis, response spectrum analysis and time history analysis, comparing period ratios, displacement ratios, the maximal story displacement and inter-story displacement, the displacement time-history curves, the torsional displacement time-history curves and the hysteresis curve. The results show that the torsional deformation of the structure can be controlled effectively. Besides, seismic action is reduced. In other words, buckling-restrained brace is an effective way to reverse the effects of torsion and can proves an new idea to torsion control. In addition, the arrangement rules in irregular structures are generalized in the paper. |
