型钢高强混凝土框架柱抗震性能试验研究

基于16个型钢高强混凝土(SRHSC)框架柱试件的低周反复加载试验，对其抗震性能进行了研究。试件设计参数为剪跨比、轴压比、混凝土强度、含钢率和配箍率。对不同设计参数试件的受力特点、破坏形态、滞回性能、骨架曲线、耗能能力、位移延性等主要抗震性能指标进行了分析，得到了试件耗能指标、位移延性与诸设计参数之间的关系曲线。试验结果表明：试件荷载-位移滞回曲线饱满，下降段较为平缓，其他各项抗震性能指标较为优异，总体上表现出良好的抗震性能；混凝土强度等级超过C100的SRHSC框架柱的承载力优势明显，但由于高强混凝土的脆性导致其耗能能力及延性较普通型钢混凝土框架柱稍差；试件剪跨比、含钢率以及配箍率的提高能够增强其抗震性能，而混凝土强度、轴压比的提高将降低其抗震性能。

Experimental research on seismic behavior of steel reinforced high strength concrete frame columns

The seismic behavior of steel reinforced high strength concrete(SRHSC) frame columns was investigated by the experiments of 16 frame column specimens subjected to a constant axial load and cyclic lateral loads.The design parameters of specimens included shear span ratio,axial compression ratio,concrete strength,steel ratio and stirrup ratio.The study focused on main seismic performance indexes of specimens which had different design parameters,such as mechanical characteristics,failure mode,hysteretic behavior,energy dissipation and ductility.The influences of design parameters on energy dissipating capacity and ductility were analyzed.The results show that the hysteretic curves of specimens are plump with relatively slow descending branches.Some other seismic performance indexes are good,indicating excellent seismic behavior.The bearing capacity of SRHSC frame columns is excellent,but the ductility and energy dissipation ability are inferior to those of ordinary steel reinforced concrete structures.With the increase of shear span ratio,steel ratio and stirrup ratio,the seismic behavior of specimens improves.However,with the increase of concrete strength and axial compression ratio,the seismic behavior of specimens decreases.