One of the main areas where it is generally accepted that fibers play a significant contribution in construction practice is in the control of cracking. The primary objective of the fibers is to traverse cracks after they nucleate. The fibers provide some post-cracking resistance to the otherwise brittle concrete. Much of the research contained in the literature on the cracking behavior of fiber reinforced concrete (FRC) members has focused on instantaneous load scenarios, without much consideration for the long-term behavior (i.e., for members which are subjected to a sustained service moment). This is mirrored in design standards where limited guidance is provided to engineers to predict and assess the long-term serviceability performance of FRC members. This paper presents a simplified model, which may be suitable for design, that can reliably predict the cracking behavior, over time, of FRC members subjected to a sustained in-service flexural load. Predictions of the proposed model are compared to both instantaneous and long-term data available in the literature. Satisfactory correlation is observed.

中文翻译：

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纤维增强混凝土受弯构件随时间变化的简化裂缝宽度预测

人们普遍认为纤维在施工实践中发挥重要作用的主要领域之一是控制开裂。纤维的主要目的是在它们成核后穿过裂纹。纤维为脆性混凝土提供了一定的后开裂抵抗力。文献中关于纤维增强混凝土 (FRC) 构件开裂行为的大部分研究都集中在瞬时载荷情况下，而没有过多考虑长期行为（即，对于承受持续服务力矩的构件） . 这反映在设计标准中，其中向工程师提供有限的指导以预测和评估 FRC 成员的长期适用性性能。本文提出了一个简化的模型，它可能适用于设计，可以可靠地预测 FRC 构件承受持续使用中的弯曲载荷随时间的开裂行为。将所提出模型的预测与文献中可用的瞬时和长期数据进行比较。观察到令人满意的相关性。