屈曲约束支撑在混凝土框架结构中的工程应用

The Application of Buckling Restrained Braces(BRB) in Concrete Frame Structure Design

某艺术中心工程拟建的音乐厅为混凝土框架结构,中部为楼板缺失的大跨度空间,此大跨度空间采用钢网架结构。由于建筑功能以及美观要求,最终确定采取屈曲约束支撑-混凝土框架结构体系。在多遇地震下,采用SATWE软件进行计算,发现无屈曲约束支撑时,结构的抗侧刚度较弱,层间位移角不能满足规范要求;加入屈曲约束支撑后,结构抗侧力得到显著改善,各项指标均满足规范要求。在罕遇地震下,采用MIDAS软件进行计算,屈曲约束支撑可视为金属阻尼器,率先屈服耗能,成为结构的第1道防线,符合抗震性能化设计多道设防的设计理念。

The application of Buckling Restrained Braces （BRB） in the structural design of concrete frame structures was presented in this paper. Calculating software SATWE was adopted in frequent earthquake stage, and MIDAS GEN was adopted in rare earthquake stage. As a part of the art centre, the concert hall is a reinforced concrete frame structure, in the centre of which is the long span room constructed in steel space truss structure. In consideration of architectural function and appearance, BRB-concrete frame structure is adopted. Obliged to frequent earthquake the concrete frame without BRB appears weakness in lateral rigidity and drift angle is dissatisfied with the allowable value of the design code. However, with the cooperation of BRB the structure behaves enough strong to resist seismic action and the indictors obey to the provision of the code. Under the rare earthquake BRB plays the role of metallic dampers and yields firstly to dissipating energy, thus BRB provides the first line of defense to the whole structure which caters to seismic performance-based design.