The Seismic Behavior Analysis And Structure Optimization Of The Super-high-rise Frame-core Tube Structure With Buckling-restrained Braces

The frame core tube structure is common in high-rise buildings. Because, the buckling restrained braces have a good energy dissipation capacity under earthquake. The outrigger truss with buckling restrained braces is widely applied in the frame core tube structure. However, without the reasonable design of the outrigger truss, not only good energy dissipation capacity can not be reached, but also the stiffness of the structure is increased. As a result, the more serious disaster may occur under earthquake. So, studying the seismic performance of the structure with buckling restrained braces outrigger truss is meaningful.The paper compares the amounts of outriggers and strengthened storeys on the basis of a high-rise building. The performance goals are set on the optimal structure and the paper verifies whether the goals are met under earthquake. Also, the dissipation capacity and the effects to the structure with different buckling restrained braces are compared.The results show that three strengthened storeys structure with two outriggers each storey are regarded as the best form and the performance goals are met under earthquake. The buckling restrained braces have good hysteretic energy dissipation capacity. The paper also compares three different shapes of buckling restrained braces and all the shapes have good dissipation capacity. The plan of arranging the ’V’ shape brace in the middle strengthened storey and arranging the ’人’ shape brace in other strengthened storeys can alleviate the stress concentration. Through the research, some suggestions on the arrangement design of buckling restrained braces can be referred in actual projects.