The Seismic Performance Of Frame-shear Wall Structure With Buckling-restrained Brace

With light weight, low cost, easy installation flexible layout and so on, buckling-restrained brace is a kind of energy dissipation brace. When it is used in building structure, it can not only improve the lateral stiffness of the structure, but also dissipate most of the seismic energy. As a result, it can reduce the influence effectively under the seismic action. Frame-shear wall structure’s vertical lateral force component is going to be a great failure due to the plastic deformation under the influence of earthquakes. If the passive control of the buckling-restrained brace is designed, the influence of the structure could be improved to a large extent. In this paper, we made a finite element simulation for a new type of buckling-restrained brace, studied the energy dissipation capacity and analyzed the effect of structural seismic performance of frame shear wall. All this will produce a strong theoretical and practical value in actual tall frame- shear wall structure’s design and installation of new buckling-restrained brace. The main contents and conclusions are as follows:Firstly, we explored a modeling method that is suitable for a new buckling-restrained in ABAQUS, established the solid finite element model, and analyzed the hysteretic behavior. After that, the seismic behavior indexes of the new buckling-restrained brace, such as the adjustment coefficient of the compressive strength, the equivalent viscous damping coefficient, the energy dissipation ratio, and the ductility factor were calculated. We proved that the support has a good seismic behavior.Secondly,this paper established a high-rise frame shear structure of three-dimensional finite element model, made analyses of frequently and rarely occurred earthquake action under the dynamic time-history analysis, and calculated the structure under various working conditions of inter-story displacement angle, found out the weak layer of the structure. According to the position of the weak layer, the initial buckling-restrained brace is designed. In order to apply the new buckling-restrained brace to the frame shear structure for an overall analysis, a simplified modeling method for buckling-restrained braces was developed.Thirdly, we made 6 to 7 degree earthquake dynamic time-history analyses respectively with the no control frame- shear wall structure and the controlled buckling-restrained brace structure, and discussed the effect of buckling-restrained brace on the seismic behavior of controlled structures. The results showed that the buckling-constraint support in the frequently occurred earthquake damping effect was not obvious, however, in the rare earthquake it worked well, and in the case of 7 degree was most remarkable. At this time, the new buckling-restrained brace consumed the most energy; in addition, the analysis showed that controlled structure can also weaken the effect of the bilateral seismic on the structure significantly.Finally, this paper puts forward an optimized design which was suitable for buckling-restrained brace design in frame-shear wall structure——it was based on the target displacement of buckling-constraint support design method, and it would make a comparison and analysis according to the time-history analysis’ result that was designed on weak layer and based on the target displacement. The study showed that: the optimization design method has a good applicability and superiority.