In this paper, the radial deformation of fiber reinforced self‐compacting concrete (SCC) pipes under cyclic fire conditions is studied. A series of experimental study on the temperature fields and radial deformation properties of steel mesh, polypropylene fiber (PP fiber), and macro steel fiber (SF) reinforced SCC pipes subjected to fire is carried out. A novel method for measuring the deformation of pipes under high temperature has been proposed. The results indicate that both micro PP fiber and macro SF are effective in decreasing the temperature difference and reducing the radial deformation in each thermal cycle. A significant positive synergistic effect on decreasing the residual radial deformation can be achieved by combined use of macro SF and micro PP fiber. The elastic theory is used to estimate the elastic portion in the total radial deformation, and the elastic radial deformation is about 22.3% of the maximum radial deformation in the first thermal cycle. Based on the elastic calculation and observed experimental results, a simplified method for estimating the maximum radial deformation in the first thermal cycle is proposed.

中文翻译：

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纤维对循环火灾条件下自密实混凝土管温度场和径向变形行为的影响

本文研究了循环火灾条件下纤维增强自密实混凝土（SCC）管的径向变形。对钢网，聚丙烯纤维（PP纤维）和大钢纤维（SF）增强的SCC火灾管的温度场和径向变形特性进行了一系列实验研究。提出了一种测量高温下管道变形的新方法。结果表明，在每个热循环中，微型PP纤维和大SF都可以有效地减小温度差并减小径向变形。宏SF和微PP纤维的组合使用可在减少残余径向变形方面产生显着的积极协同作用。弹性理论用于估计总径向变形中的弹性部分，并且弹性径向变形约为第一热循环中最大径向变形的22.3％。基于弹性计算和观察到的实验结果，提出了一种简化的估算第一热循环中最大径向变形的方法。