摘要
防屈曲支撑(buckling-restrained braces,BRB)不仅为结构提供抗侧刚度,且在地震中可通过芯材的屈服吸收能量,从而减少输入主体结构的能量,有效地改善了结构的抗震性能。防屈曲支撑在结构体系中的合理配置是影响结构抗震性能的重要因素。对于防屈曲支撑-钢筋混凝土(Reinforced Concrete,RC)框架结构,主体结构刚度主要由梁柱构件截面尺寸决定,而主体结构强度由截面尺寸和配筋共同决定。基于此,以BRB-RC框架结构为例,分别采用基于剪力比和刚度比的设计方法进行BRB参数设计,对2种方法设计后的结构进行反应谱及弹塑性时程分析,从周期、层间位移角最大值、滞回耗能比及滞回曲线等方面对结构抗震性能进行评估和对比分析。分析获得了基于刚度比和剪力比设计方法的优缺点,为BRB-RC框架结构的减震设计提供了参考。
In addition to providing lateral stiffness for the structure, Buckling Restrained Braces （BRB） can also absorb energy in earthquake through the yielding of core material and thus the energy input of the main structure will be reduced so that the seismic performance of the structure will be improved effectively. The reasonable config- uration of the Buckling Restrained Brace is an important factor affecting the seismic performance of the structure. For one buckling restrained braced concrete frame structure, the main structural stiffness is mainly determined by the sections of beams and columns while the strength of the main structure is jointly determined by the sections and reinforcement. Based on this, taking a BRB - RC frame structure as an example, the paper chose the BRB parame- ters based on the shear ratio and stiffness ratio methods. Then, the response spectrum and time history analysis by these two methods were analyzed. Finally, a comparison study and evaluation of the seismic performance of the structure partly from four aspects including period, the maximum interstory drift ratio, hysteretic energy ratio and hysteresis curve were conducted in this paper. The advantages and disadvantages of the design methods based on the stiffness ratio and shear ratio was discussed in this paper, which providles a reference for the design of BRB-RCframe structure.
出处
《世界地震工程》
CSCD
北大核心
2017年第4期59-67,共9页
World Earthquake Engineering
基金
国家重点研发计划(2016YFC0802205)
国家自然科学基金项目(51608073)
四川省科技支撑计划项目(2014SZ0110)
关键词
防屈曲支撑
剪力比
刚度比
混凝土框架
抗震设计
buckling-restrained braces
shear ratio
stiffness ratio
reinforced concrete frame structures
seismic design
