摘要
为研究型钢再生混凝土柱的破坏形态和抗震性能,对10个不同剪跨比、再生粗骨料取代率、轴压比、体积配箍率的型钢再生混凝土柱进行低周反复荷载试验,观察其受力过程及破坏形态,分析不同设计参数对荷载-位移滞回曲线、骨架曲线、承载能力、延性、耗能能力及刚度退化等力学性能的影响。试验研究结果表明:型钢再生混凝土柱的主要破坏形态为剪切斜压破坏、弯剪破坏以及弯曲型破坏,破坏形态与剪跨比有关;滞回曲线大多呈梭形且较为饱满,说明型钢再生混凝土柱具有较好的延性及耗能能力;取代率对试件承载力影响不明显,延性及耗能能力随取代率的增加而有所降低;随着轴压比的增大,试件承载力有一定提高,但其衰减加快,且延性及耗能能力降低;增大体积配箍率时,试件承载力增大不明显,但延性及耗能能力显著提高。总体上看,型钢再生混凝土柱具有较好的抗震性能,可以通过合理的设计将其应用于抗震结构中。
In order to investigate the failure pattern and seismic performance of steel reinforced recycled concrete column, ten specimens with various replacement rate of recycled coarse aggregate, shear span ratios, axial compression ratios, volume stirrup ratios were tested under low cyclic reversed loading. The failure process and pattern were observed. The mechanical behaviors such as load-displacement hysteretic loops, skeleton curves, load carrying capacity, ductility, energy dissipation capacity and stiffness degradation of steel reinforced recycled concrete columns were analyzed. It is shown that the shear diagonal compression failure, shear-bending failure and bending failure are the main patterns of steel reinforced recycled concrete columns. The load-displacement hysteretic loops of most specimens are in plump spindle-shape, which reflects that the steel reinforced recycled concrete column has good ductility and energy- dissipation capacity. The load-carrying capacity of specimens increases little with the replacement rate of recycled coarse aggregate. However, the ductility or energy dissipation capacity decreases much. With the increment of axial compression ratio, the load carrying capacity of specimens increase, the ductility or energy-dissipation capacity decreases rapidly. The ductility and energy dissipation capacity increase with the increase of the volume stirrup ratio much than the load-carrying capacity. It is concluded that the steel reinforced recycled concrete column has good seismic performance and can be used in seismic structures by reasonable design.
出处
《土木工程学报》
EI
CSCD
北大核心
2014年第1期36-46,共11页
China Civil Engineering Journal
基金
国家自然科学基金(51178384)
陕西省留学人员科技活动择优资助项目(陕外专发[2010]26号)
住房和城乡建设部科学技术项目(2012-K2-12)
陕西省教育厅科研计划项目(12JK0902)
长江学者和创新团队发展计划项目
关键词
型钢混凝土
再生混凝土柱
粗骨料取代率
低周反复加载试验
抗震性能
steel reinforced concrete
recycled concrete column
coarse aggregate replacement rate
low-cyclic reversedloading
seismic performance
