Fatigue behavior and calculation methods of high strength steel fiber reinforced concrete beam

Sustainable Structures Pub Date : 2023-02-01 DOI:10.54113/j.sust.2023.000028

Zhiqiang Gu, H. Feng, Danying Gao, Jun Zhao, Congjie Wei, Chenglin Wu

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引用次数: 4

Abstract

Adding steel fibers into concrete was considered as one of the most effective ways to restrain the crack development and improve the stiffness for reinforced concrete (RC) structures. To explore the reinforcement mechanism of steel fibers on the fatigue behavior of high-strength RC beam, eight high-strength steel fiber reinforced concrete (HSSFRC) beams subjected to fatigue loading were tested in this study. The main design parameters considered in this work were stress level and steel fiber content. The failure mode, crack patterns, fatigue life, crack width, and stiffness degradation of HSSFRC beams under fatigue loading were discussed. The results showed that steel fibers could significantly increase the fatigue life, restrain crack development, and improve crack patterns of HSSFRC beams under fatigue loading compared to ordinary RC beams. Both the crack width and stiffness degradation rate of beams decrease with increasing steel fiber content. Besides, the empirical formulas for calculating the maximum crack width and midspan deflection of HSSFRC beam under fatigue loading were proposed and validated using experimental results.

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高强钢纤维混凝土梁的疲劳性能及计算方法

在混凝土中加入钢纤维被认为是抑制钢筋混凝土结构裂缝发展和提高结构刚度的最有效方法之一。为探讨钢纤维对高强钢筋混凝土梁疲劳性能的增强机理，本研究对8根高强度钢纤维混凝土梁进行了疲劳加载试验。在这项工作中考虑的主要设计参数是应力水平和钢纤维含量。讨论了疲劳荷载作用下HSSFRC梁的破坏模式、裂缝形态、疲劳寿命、裂缝宽度和刚度退化。结果表明:与普通RC梁相比，钢纤维能显著提高HSSFRC梁在疲劳荷载作用下的疲劳寿命，抑制裂缝发展，改善裂缝形态;随着钢纤维掺量的增加，梁的裂缝宽度和刚度退化率均减小。提出了计算疲劳荷载作用下HSSFRC梁最大裂缝宽度和跨中挠度的经验公式，并用试验结果进行了验证。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Sustainable Structures

CiteScore

14.20

自引率

0.00%

发文量