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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。
The seismic behavior of 16 SRHSC frame columns under low cyclic loading was studied. The design parameters of the specimen are shear span ratio, axial compression ratio, concrete strength, steel content and stirrup ratio. The main seismic performance indexes such as force characteristics, failure mode, hysteretic behavior, skeleton curve, energy dissipation capacity and displacement ductility of specimens with different design parameters were analyzed. The energy dissipation index, displacement ductility and design parameters The relationship between the curve. The test results show that the load-displacement hysteresis curve of the specimen is full, the descending section is relatively flat, the other seismic performance indexes are excellent, and the overall seismic performance is good. The bearing capacity advantage of SRHSC columns with concrete strength exceeding C100 However, due to the brittleness of high-strength concrete, its energy dissipation capacity and ductility are slightly worse than ordinary steel reinforced concrete frame columns. The shear span ratio, steel content and stirrup ratio can enhance the seismic performance of concrete, while the strength of concrete, Increasing the pressure ratio will reduce its seismic performance.