Application Research Of Buckling Restrained Brace In Double-tower-connected Structure

Double-tower-connected structure is a kind of complex structure system, which has advantages in engineering application, so it is more and more widely used in practical engineering. However, there is a strong spatial coupling effect between the two towers of the double-tower-connected structure system due to the connecting body, resulting in stress much more complex under seismic action than general single tower high-rise building structure, so explore how to improve the seismic performance of this kind of structure is very important, which has the necessary significance in theoretical and practical. Buckling restrained brace as a new type of energy dissipation brace, applied in the double-tower-connected structure, provides a new method for improving the seismic performance of double tower connected structure. Based on the summary of past scholars study of double-tower-connected structure and buckling restrained brace, this article from many aspects to research how to apply buckling restrained brace in double-tower-connected structure, The main research work as follows.Fisrt of all, a theoretical study on the buckling restrained brace is carried out, analysis the working principle of buckling restrained brace, and based on the relative theory, the preliminary design of the buckling restrained brace is derived by using the nominal lateral stiffness ratio.Secondly, a 20 storey double-tower-connected structure as the basic research object, three-dimensional space model of structure was established by using the finite element software and take the two sets of BRB in different layout scheme, they were compared and analyzed with the original structure.Thirdly, through the static analysis of the structure, buckling restrained brace can increase the double-tower-connected structure lateral stiffness, reduce the torsional effect of structure in higher modes, and can be a very good control in the interlayer displacement and interlayer shear force to structure, so as to improve the seismic performance of the double tower connected structure to ensure structure of the main body from being damaged.Finally, through the time interval analysis of the structure, The lateral stiffness of the double-tower-connected structure can be more uniform along the vertical distribution by using BRB, and the elastic-plastic interlayer displacement angle of the structure can be reduced, the weak layer of the structure can be prevented. And the buckling restrained braces can consume a large amount of seismic energy by its yield, so that it can play a role in energy dissipation.