Plastic Hinge Length of FRP-Confined Square RC Columns
Plastic Hinge Length of FRP-Confined Square RC Columns
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FRP 约束 RC 方柱的塑料铰长度
DOI：
10.1061/(asce)cc.1943-5614.0000463
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发表时间：
2014-08-01
影响因子：
4.6
通讯作者：
Wu, Gang
中科院分区：
文献类型：
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作者：
Jiang, Cheng;Wu, Yu-Fei;Wu, Gang
通过实验测试和分析研究，研究了纤维增强聚合物（FRP）外套对钢筋混凝土方柱塑性铰长度的约束作用。测试了七个具有不同约束比的半比例RC方柱。纵向钢筋的应变和屈服程度通过安装在钢筋内部的应变仪进行测量。测试过程中通过数字图像相关（DIC）连续记录外柱面应变场的变化。使用更合理的数据分析方法来从测量的应变场中识别塑性铰链长度。结果表明，与无侧限RC柱相比，FRP护套在低约束水平时增加了塑性铰长度，而在高约束水平时则减少了塑性铰长度。分析研究表明，所有现有的塑性铰链长度模型都存在这样或那样的不足，因为没有一个模型包含所有重要因素。所提出的模型可以正确捕捉趋势，但当有更多数据可用时，其准确性需要进一步改进。
The confinement effect of fiber-reinforced polymer (FRP) jacket on the plastic hinge length of square RC columns is studied through experimental testing and analytical study. Seven half-scale RC square columns with different confinement ratios were tested. The strain of longitudinal reinforcement bars and the extent of yielding were measured by strain gauges mounted inside the reinforcement bars. The variation of the strain field of the external column face was recorded continuously by digital image correlation (DIC) during a test. More rational approaches of data analysis are used for identification of plastic hinge length from measured strain fields. The obtained results show that compared with unconfined RC columns, FRP jacketing increases the plastic hinge length when the confinement level is low, but reduces it when the confinement level is high. The analytical study shows that all existing models of plastic hinge length are inadequate in one way or another because no model includes all important factors. The proposed model can correctly capture the trends but it needs to be further improved for accuracy when more data are available.