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四种FRP管约束UHPC轴压特性的试验研究

Keywords: 纤维增强聚合物,超高性能混凝土,约束,轴压性能

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Abstract:

为研究纤维增强聚合物(fiberreinforcedpolymer,FRP)管约束超高性能混凝土(ultra-highperformanceconcrete,UHPC)的轴压特性,分别对4个未约束和36个约束圆柱体试件进行了轴压试验,测定了应力-应变全曲线,获得了强度和极限应变值.试验结果发现:FRP约束UHPC可明显提高其强度和变形能力,纤维布层数愈多、强度越高,改善效果愈明显;轴压应力-应变曲线为双线性;在相近的约束比下,FRP管约束刚度越小,约束试件的极限应变值越大;已有的强度和极限应变的模型预测值均高于实测值,极限应变预测值偏离试验值更大.本文回归得到了FRP管UHPC的强度和极限应变预测公式预测精度较高.

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