Recently, the multiscale hybrid fiber reinforced cementitious composites (MSHyFRCC) with steel fibers, polyvinyl alcohol (PVA) fibers, and calcium carbonate whiskers had developed with improved mechanical properties under static load. Although, there is still a research gap to study its behavior and properties under the action of earthquake load. In this work, the properties of steel fibers, PVA fibers, and calcium carbonate whisker hybrid FRCC are evaluated by using single degree of freedom hydraulic shaking table. A total of 10 mixes having different mix proportions, fiber lengths, and contents of steel fibers, PVA fibers, and calcium carbonate whiskers are considered. The stress–strain curves, failure mode of cubes, compressive strength, peak micro‐strain, strain energy density, failure mode of column specimen, displacement‐time curves, strain‐time curves, and top acceleration‐time curves are studied. The multiscale hybrid fibers offer resistances against crack growth under dynamic load which results in longer time period with improved displacement, strain, and acceleration. The 1.5% steel fibers of 13 mm, 0.75% PVA fibers of 6 mm with 1% calcium carbonate whiskers and 1.25% steel fibers of 35 mm, 0.55% PVA fibers of 12 mm with 2% calcium carbonate whiskers are proposed to be the optimized mixes for short‐ and long‐length hybrid fibers, respectively.

中文翻译：

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单自由度水力振动台下多尺度混杂纤维增强水泥基复合材料的有效性

最近，已开发出具有钢纤维，聚乙烯醇（PVA）纤维和碳酸钙晶须的多尺度混杂纤维增强水泥基复合材料（MSHyFRCC），该复合材料在静态载荷下具有改善的机械性能。尽管，在地震荷载作用下研究其行为和性质仍存在研究空白。在这项工作中，使用单自由度液压振动台评估了钢纤维，PVA纤维和碳酸钙晶须混合FRCC的性能。总共考虑了10种混合料，这些混合料具有不同的混合比例，纤维长度以及钢纤维，PVA纤维和碳酸钙晶须的含量。应力-应变曲线，立方体的破坏模式，抗压强度，峰值微应变，应变能密度，柱试样的破坏模式，位移-时间曲线，研究了应变时间曲线和最高加速时间曲线。多尺度杂化纤维可抵抗动态载荷下的裂纹扩展，从而延长使用寿命，并改善位移，应变和加速度。建议对13毫米的1.5％钢纤维，6毫米的0.75％PVA纤维和1％的碳酸钙晶须以及35毫米的1.25％的钢纤维，12毫米的0.55％PVA纤维和2％的碳酸钙晶须进行优化分别混合用于短和长混合纤维。