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Compressive stress-strain behavior of CFRP-confined lightweight aggregate concrete reinforced with hybrid fibers

机译：用杂交纤维加固CFRP限制轻质骨料混凝土的压缩应力 - 应变行为

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摘要

The axial compressive stress-strain behavior of CFRP-confined lightweight aggregate concrete (LWAC) with short carbon fiber and/or polypropylene fiber was investigated. Thirty cylinders with different concrete types (normal weight concrete and LWAC), fiber types (carbon fiber, polypropylene fiber, and mixture of these two fibers), volume faction of fibers (from 0% to 0.4% for each fiber type in single and hybrid form), and spacing between CFPR straps (0 mm, 30 mm, and 50 mm) were experimentally studied. The compressive strengths of CFRP-confined LWAC were improved to 1.01-1.51 times the unconfined strength, and LWAC showed less enhancement in compressive strength provided by confining pressure compared with normal weight concrete. The increase in spacing between CFRP straps declined the confining effect. Addition of carbon fiber in both single and hybrid form positively affected the toughness of CFRP-confined LWAC, while the polypropylene fiber showed few influences on properties of LWAC. Models for the peak stress and corresponding strain were established by collected and present test data. Then theoretical stress-strain model was developed by combining iterative calculation of ascending portion and close-form formula of descending branch. The proposed model showed good match to the test results.
机译：研究了CFRP限制轻质聚集体混凝土（LWAC）具有短碳纤维和/或聚丙烯纤维的轴向压缩应力应变行为。三十个气缸，具有不同的混凝土类型（正常体积混凝土和LWAC），纤维类型（碳纤维，聚丙烯纤维和这两种纤维的混合物），纤维的体积占派（每种纤维类型为单一和杂种的0％至0.4％）实验研究了形式的），并在实验研究CFPR带（0mm，30mm和50 mm）之间的间隔。 CFRP限制LWAC的抗压强度得到了不包含束强度的1.01-1.51倍，与正常重量混凝土相比，通过限制压力提供的压缩强度的增强表现出较低的增强。 CFRP带子之间间距的增加均下降了限制效果。在单一和杂交形式中添加碳纤维积极影响CFRP限制LWAC的韧性，而聚丙烯纤维显示出LWAC性质的影响很少。通过收集和目前的测试数据建立峰值应力和相应菌株的模型。然后通过组合下降分支的升级和闭合形式公式的迭代计算来开发理论应力 - 应变模型。所提出的模型与测试结果显示出良好的匹配。

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