Compressive Behavior of Steel-Fiber-Reinforced Concrete with a High Reinforcing Index
Compressive Behavior of Steel-Fiber-Reinforced Concrete with a High Reinforcing Index
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DOI：
10.1061/(asce)mt.1943-5533.0000372
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发表时间：
2012-02-01
影响因子：
3.2
通讯作者：
Chang, Kuo-Chun
中科院分区：
文献类型：
--
作者：
Ou, Yu-Chen;Tsai, Mu-Sen;Chang, Kuo-Chun
通过圆柱体压缩试验，研究了高配筋指数钢纤维混凝土(SFRC)的压应力-应变特性。所考察的钢纤维的增强指数高达1.7，其定义为纤维的体积分数和长径比的乘积。考虑了不同长度和长径比的钩端纤维。试验结果表明，增强指数越高，钢纤维混凝土的峰值应力应变越大，韧性越高，其增强指数与纤维体积分数为2%时的增强指数大致相当。钢纤维的掺入对钢纤维混凝土的弹性模量和抗压强度影响不大。较长的钢纤维和长径比较小的钢纤维对钢纤维混凝土的韧性有较大的提高。在试验结果的基础上，建立了加固指数高达1.7的钢纤维混凝土受压和韧性应力-应变曲线的分析模型。DOI：10.1061/(ASCE)MT.1943-5533.0000372。(C)2012年美国土木工程师学会。
Compression tests on cylinders were performed to characterize the compressive stress-strain behavior of steel fiber-reinforced concrete (SFRC) with a high reinforcing index. The reinforcing index, defined as the product of the volume fraction and the aspect ratio of the fibers, of steel fibers examined was as high as 1.7. Hooked-end fibers of various lengths and aspect ratios were considered. The test results indicated that a higher reinforcing index was associated with a higher strain at the peak stress and a higher toughness of SFRC, up to a reinforcing index approximately equal to that corresponding to a 2% fiber volume fraction. Adding steel fibers had little effect on the modulus of elasticity and compressive strength of SFRC. Long steel fibers and fibers with a lower aspect ratio resulted in a larger increase of the toughness of SFRC. On the basis of the test results, analytical models of the stress-strain curve in compression and toughness of SFRC with a reinforcing index up to 1.7 are developed. DOI: 10.1061/(ASCE)MT.1943-5533.0000372. (C) 2012 American Society of Civil Engineers.