Tensile fracture properties of an Ultra High Performance Fiber Reinforced Concrete (UHPFRC) with steel fiber
Tensile fracture properties of an Ultra High Performance Fiber Reinforced Concrete (UHPFRC) with steel fiber
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DOI：
10.1016/j.compstruct.2009.06.012
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发表时间：
2010-01-01
影响因子：
6.3
通讯作者：
Kim, Jin-Keun
中科院分区：
文献类型：
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作者：
Kang, Su-Tae;Lee, Yun;Kim, Jin-Keun
研究了纤维掺量对超高性能纤维混凝土(UHPFRC)拉伸断裂性能的影响。为了考察纤维含量的影响，进行了纤维体积比从0%到5%的缺口三点弯曲试验。通过弯曲试验发现，超高性能混凝土的抗弯强度随纤维体积比的增加呈线性增加，混合规律适用于超高性能混凝土。在此基础上，通过反分析确定了超高性能钢纤维混凝土的拉伸断裂模型，提出了超高性能混凝土的三线性拉伸软化模型。该模型较好地反映了随着纤维含量的增加，恒应力桥联区的增大和抗应力区的减小。该模型适用于不同纤维掺量水平的超高性能混凝土结构设计和数值分析，具有较强的通用性。(C)2009爱思唯尔有限公司。保留所有权利。
This paper presents a study of the tensile fracture properties of Ultra High Performance Fiber Reinforced Concrete (UHPFRC) considering the effects of the fiber content. To investigate the impact of fiber content, notched 3-point bending tests were executed, where the fiber volume ratio was varied from 0% to 5%. From the bending tests, it was found that the flexural tensile strength of UHPFRC linearly increases with increasing fiber volume ratio and the rule of mixture can be applied to UHPFRC. Furthermore, an inverse analysis was performed to determine the tensile fracture model of UHPFRC and a tri-linear tensile softening model is suggested. The suggested model successfully represents the increase of the stress-constant bridging zone and the decrease of the stress-resisting zone with increasing fiber content. The proposed model for various fiber content levels is simple and versatile and can be readily applied to structural design or numerical analysis of UHPFRC. (C) 2009 Elsevier Ltd. All rights reserved.