Research on CFRP confined circular concrete-filled steel tubular columns subjected to cyclic lateral forces
Research on CFRP confined circular concrete-filled steel tubular columns subjected to cyclic lateral forces
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发表时间：
2013
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通讯作者：
Qin Pen
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作者：
Qin Pen
对2根普通钢管混凝土柱和4根碳纤维布（CFRP）约束钢管混凝土柱进行了等轴压反复荷载试验，分析了其破坏模式，试验结果表明，碳纤维布的水平约束能有效地改善钢框架的滞回性能，纤维改变了钢管混凝土的破坏模式，根据试件的循环能耗，建立了基于疲劳耗能的累积损伤模型，模拟了柱的损伤程度，分析了能量耗散与损伤的关系结果表明，不同加载顺序对试件损伤有影响，损伤指数随循环幅值的增加而增加，但在相同加载顺序下，总能耗与最终损伤指数基本一致，试件能耗与损伤指数具有良好的相关性，表明该模型可用于累积损伤评估。
Reversed cyclic loading under constant axial load experiment was conducted on 2 conventional concrete filled steel tubular(CFT) columns and 4 carbon-fiber-reinforced polymer(CFRP) confined concrete filled steel tubular(CFT) columns.Failure mode,hysteretic behavior and energy dissipation were investigated.The experimental results show the horizontal restraining by carbon-fiber changes the failure mode of the CFT.Based on the cyclic energy consumption of the specimens,a cumulative damage model based on fatigue energy consumption was established to simulate the damage extent of the column.The relationship between energy dissipation and damage index was analyzed,and we found that the different loading sequence has influence on the specimen damage.The damage index was increased with the cyclic amplitude,however the total energy consumption and the final damage index achieve the same level when the parameters are the same.The energy consumption of the specimens has good correlation with the damage index.This indicates the proposed model could be used for accumulative damage evaluation.