Penna Rosa, Feo Luciano, Martinelli Enzo, Pepe Marco
Department of Civil Engineering, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, Italy.
TESIS s.r.l., Via Giovanni Paolo II, 132, 84084 Fisciano, Italy.
Materials (Basel). 2022 Sep 3;15(17):6122. doi: 10.3390/ma15176122.
High-performance fibre-reinforced concrete (HPFRC) is a composite material in which the advantages of fibre-reinforced concrete (FRC) are combined with those of a high-performance concrete (HPC), which mitigates the weaknesses of conventional concrete and improves its overall performance. With the aim to reduce the long-term maintenance costs of structures, such as heavily loaded bridges, HPFRC is highly recommended due to its major durability performance. Specifically, its good antifreezing property makes it suitable for application in cold regions where cyclic freeze-thaw conditions cause the concrete to degrade. In this paper, a numerical simulation of the degradation processes induced by freeze-thaw cycles on bond-slip laws in HPFRC beam specimens has been developed so as to assess their effect on the flexural response of specimens as the fibres' volume percentage changes. Their cracking strength, postcracking strength, and toughness were predicted, with the present model being able to predict the cracking strength, postcracking strength and toughness of the HPFRC beam element under bending load conditions. Its accuracy was confirmed by comparing the model predictions with experimental results.
高性能纤维增强混凝土（HPFRC）是一种复合材料，它将纤维增强混凝土（FRC）的优点与高性能混凝土（HPC）的优点结合在一起，减轻了传统混凝土的弱点，提高了其整体性能。为了降低诸如重载桥梁等结构的长期维护成本，由于其主要的耐久性性能，HPFRC被高度推荐。具体而言，其良好的抗冻性能使其适用于寒冷地区，在这些地区，循环冻融条件会导致混凝土劣化。在本文中，针对HPFRC梁试件中冻融循环引起的粘结滑移规律的退化过程进行了数值模拟，以便评估随着纤维体积百分比的变化，它们对试件弯曲响应的影响。预测了它们的开裂强度、开裂后强度和韧性，本模型能够预测弯曲荷载条件下HPFRC梁单元的开裂强度、开裂后强度和韧性。通过将模型预测结果与实验结果进行比较，证实了其准确性。
