摘要
结合某高地震烈度区工程,对混凝土框架-屈曲约束支撑结构的抗震设计方法以及相关问题进行了研究。分析了混凝土框架-屈曲约束支撑结构的最大适用高度、合理的附加刚度、适宜的层间位移角限值,并通过罕遇地震下的弹塑性时程分析考察结构的抗震性能。结果表明:混凝土框架-屈曲约束支撑结构的抗震性能优于纯混凝土结构,主体混凝土框架更容易成为"损伤可控结构",实现震后可恢复性;建议混凝土框架-屈曲约束支撑结构的最大适用高度按混凝土框架结构和框架-抗震墙结构二者最大适用高度的平均值采用;为控制主体混凝土框架的损伤,屈曲约束支撑按刚度分配的地震倾覆力矩宜大于结构总地震倾覆力矩的50%,在各层承担的楼层地震剪力不宜小于30%;建议屈曲约束支撑的附加刚度比控制在1左右,延性系数不小于3;混凝土框架-屈曲约束支撑结构相对于混凝土框架结构的层间位移角限值,在多遇地震下应根据支撑不屈服的要求做适当调整。
Combined with a project in high seismic intensity area, the seismic design method and related problems of concrete frame-buckling restrained braced structure were studied. The maximum applicable height, reasonable additional stiffness and appropriate limit value of interlayer displacement angle of the concrete frame-buckling restrained braced structure were analyzed, and the seismic performance of the structure was investigated by elastic-plastic time-history analysis under the rare earthquake. The results show that the seismic performance of the concrete frame-buckling restrained braced structure is better than that of the pure concrete frame structure, and the main concrete frame is more likely to become a "damage controlled structure" to achieve post-earthquake recoverability. It is suggested that the maximum applicable height of the concrete frame-buckling restrained braced structure should be the average of the maximum applicable height of the concrete frame structure and the frame-wall structure. In order to control the damage of the main concrete frame, the seismic overturning moment distributed in the buckling restrained brace according to the rigidity shall be greater than 50% of the total seismic overturning moment of the structure, and the seismic shear force on each floor shall not be less than 30%. It is recommended that the additional rigidity ratio of the buckling restrained brace shall be controlled at about 1, and the ductility coefficient shall not be less than 3. The limit value of the interlayer displacement angle of the concrete frame buckling restrained braced structure relative to the concrete frame structure should be adjusted properly according to the non-yielding requirement of the brace under the frequent earthquake.
作者
黄锐
姚佩歆
Huang Rui;Yao Peixin(Gansu Provincial Architectural Design&Research Institute Co.,Ltd.,Lanzhou 730030,China)
出处
《建筑结构》
CSCD
北大核心
2020年第3期59-65,共7页
Building Structure
关键词
混凝土框架-屈曲约束支撑结构
损伤可控结构
附加刚度比
concrete frame-buckling restrained braced structure
damage controllable structure
additional stiffness ratio
