摘要
为研究型钢超高强混凝土柱的抗震性能,开展了27根型钢超高强混凝土柱试件的低周反复加载试验。试件设计参数为剪跨比、轴压力水平、配箍、型钢和栓钉配置情况。针对不同设计参数的试件的破坏特征、滞回曲线、水平承载力、耗能能力及变形能力、承载力及刚度退化等进行了分析,得到了各设计参数的影响规律。试验结果表明:型钢超高强混凝土柱的滞回曲线饱满且较稳定;剪跨比较大、轴压比较低、箍筋有效约束指标较大、配置H型或十字型钢的试件具有更好的抗震性能;型钢在箍筋约束效果较好时,能更充分地发挥提高柱抗震性能的作用;通过配置高强度八边形复合箍筋,能有效避免型钢超高强混凝土短柱发生脆性剪切破坏,使得其最终破坏形态为弯曲破坏,从而改善其抗震性能;配置栓钉能提高柱的抗震性能,且当柱的变形能力较强时效果更明显;试验轴压比为0.38或0.45的试件仍具有较强的耗能能力和变形能力,即型钢超高强混凝土柱具有较好的抗震性能。
A total of twenty-seven steel reinforced high strength concrete( SRHC) columns were tested under lateral cyclic force and constant axial load. The seismic behavior of the columns,including failure modes,hysteretic behavior, lateral load carrying capacity, energy dissipation and deformation capacity, stiffness and strength degradation,were investigated. The parameters considered were span-to-depth ratio,axial load level,stirrup details,structural steel arrangement and studs,and effects of the parameters on seismic behavior of columns were studied. It is found that the hysteretic loops of SRHC columns confined properly are plump and stable. Columns with larger span-todepth ratio,lower axial load level,larger effective confinement index of stirrups,H / +-shaped structural steel have better seismic behavior. Benefit of structural steel on seismic behavior of columns is more significant when effective confinement index is larger. SRHC short columns confined by high strength multiple stirrups fail as ductile flexural failure mode,instead of brittle shear failure mode. Columns with studs possess better seismic behavior than columns without studs. At the same time,improvement of seismic behavior due to studs is more obvious,if the columns have better deformation capacity. SRHC columns,even if subjected to large axial load with an axial load ratio of 0. 38 or0. 45,may have excellent seismic behavior with sufficient energy dissipation and deformation capacity.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2015年第4期57-67,共11页
Journal of Building Structures
基金
国家自然科学基金项目(51178078,51178051)
关键词
钢-混凝土组合结构
型钢超高强混凝土柱
拟静力试验
抗震性能
composite structure
steel reinforced high strength concrete column
quasi-static test
seismic behavior
