建筑结构学报2017，Vol.38Issue(8)：25-34,10.DOI:10.14006/j.jzjgxb.2017.08.003
附加减震钢框架的加固混凝土框架结构抗震性能试验研究
Seismic behavior of concrete frames retrofitted with externally added seismic reductional steel frames
摘要
Abstract
For increasing the seismic capabilities of existing concrete frames,a steel frame with buckling-restrained braces (BRBs) is externally added without significant increment of inner forces within the existing frame.One pure concrete frame model and two concrete frame models retrofitted with externally added BRB steel frames were designed and manufactured,and statically cyclic loading tests were conducted.Seismic performance of the structures,including the status of cracks and failures,the hysteretic shear force-lateral displacement curves,the skeleton curves,the degradation of equivalent stiffness,the equivalent damping ratio,and the relation between strain and shear force in the external steel frames and the concrete beams,has been investigated through the tests.It is indicated that with the externally added steel frames,the hysteretic shear force-displacement curves have full shapes while the failure mechanism is improved reasonably,and BRBs can dissipate seismic energy stably.Shear bearing capacity of the retrofitted structures can increase by at least two times than that of the existing concrete frame.The existing structure,the added steel frames and the installed BRBs coordinate well.Within the seismic design target,the brittle compression-shear failure of concrete columns can thus be avoided.Finally,the design suggestions for improving the connection details of the externally added steel frames has been put forward.关键词
混凝土框架/减震钢框架/屈曲约束支撑/抗震加固与改造Key words
concrete frame/energy-dissipation steel frame/BRB/seismic retrofit and rehabilitation分类
建筑与水利引用本文复制引用
徐帅,高向宇,吴军,任洁..附加减震钢框架的加固混凝土框架结构抗震性能试验研究[J].建筑结构学报,2017,38(8):25-34,10.基金项目
国家自然科学基金面上项目(8141001),北京市住房和城乡建设委员会科技项目(BJJQ-2010-169-01). （8141001）
