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Crack-bridging degradation and evolution in SFRC structural beams under variable amplitude flexural cyclic loading

机译：可变幅度弯曲循环载荷下SFRC结构梁的裂纹桥接劣化和演化

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摘要

A few studies have demonstrated a degradation in the performance of the steel-fibers in bridging cracks over the lifetime of steel-fiber reinforced concrete (SFRC) structures but only considered for constant amplitude cyclic loading. However, SFRC structures in practice are subjected to variable amplitude loading, thus their crackbridging would be influenced by the preceding loading history. This concern has so far remained unexplored. This study presents experimental and analytical flexural cyclic responses of SFRC structural beams under constant and variable amplitudes. The crack-bridging stresses are evaluated using a proposed inverse method based on sectional analysis calculations. Besides, the maximum rebar strain level is correlated with the crack-bridging degradation law, aiming at reflecting the beam's macroscopic response. The results show that crack-bridging stress increases if the fatigue load level increases, indicating that new fibers play a role in bridging cracks along the crack length. Further, decreasing the fatigue load level leads to an instant decrease in crack-bridging, which is followed by a stabilization as the pullout stress applied to the bridging fibers is reduced. Finally, a diagram of crack-bridging degradation and evolution is proposed regarding the maximum rebar strain, which is supposed to be a valuable tool in the SFRC structural design.
机译：一些研究已经证明，在钢纤维增强混凝土（SFRC）结构的寿命上的桥接裂缝中的钢纤维的性能下降了降低，但仅考虑恒定幅度循环载荷。然而，实践中的SFRC结构受到可变幅度载荷，因此它们的裂缝将受到前一个装载历史的影响。到目前为止，这一问题仍然是未开发的。该研究介绍了恒定和可变幅度下SFRC结构梁的实验和分析弯曲环状响应。使用基于截面分析计算的提出的逆方法评估裂缝桥接应力。此外，最大钢筋应变水平与裂缝桥接劣化法相关，旨在反映光束的宏观反应。结果表明，如果疲劳负载水平增加，裂纹桥接应力会增加，表明新纤维在沿裂缝长度桥接裂缝中起作用。此外，减小疲劳载荷水平导致裂纹桥接的瞬时降低，然后随后施加到桥接纤维的拉伸应力而被稳定。最后，提出了关于最大钢筋菌株的裂缝桥接劣化和演化图，这应该是SFRC结构设计中的有价值的工具。

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