混杂纤维增强混凝土的动态力学性能

IF 2.1 Q2 ENGINEERING, CIVIL International Journal of Protective Structures Pub Date : 2022-01-06 DOI:10.1177/20414196211065480
Yong Zhang, Li Chen, Dongbao Zhou
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引用次数: 5

摘要

在本研究中,利用SHPB试验装置分析了混杂纤维混凝土(HFRC)的动态力学性能,包括破坏模式、动态增长因子(DIF)和峰值应变。影响动态力学性能的因素包括纤维类型和纤维含量。结果表明,纤维的动态力学性能最好的是中、低应变速率下的CS-PHFRC和高应变速率时的AS-PHFRC。在一定范围内,纤维含量越高,相应HFRC的DIF越大,动态抗压强度的提高越明显。AS-CSHFRC提高了HFRC的动态压缩变形能力。聚丙烯纤维引起塑性,如混凝土的破坏模式所示。通过引入损伤因子对Ottosen非线性弹性模型进行修正,可以更好地描述HFRC的动态力学性能。
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Dynamic mechanical properties of hybrid fiber reinforced concrete
In this study, the dynamic mechanical properties of hybrid fiber reinforced concrete (HFRC) are analyzed with respect to failure mode, dynamic increase factor (DIF), and peak strain by means of a SHPB testing apparatus. The factors that influence the dynamic mechanical properties include fiber type and fiber content. It is concluded that the best dynamic mechanical properties of fibers are CS-PHFRC at medium and low strain rates and AS-PHFRC at a high strain rate. Within a certain range, the higher the fiber content is, the larger the DIF of the corresponding HFRC and the more obvious the increase in dynamic compressive strength. AS-CSHFRC improves the dynamic compressive deformability of the HFRC. The polypropylene fiber causes plasticity, as shown in the failure mode of concrete. The Ottosen nonlinear elastic model, modified by introducing the damage factor, can better describe the dynamic mechanical properties of HFRC.
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来源期刊
CiteScore
4.30
自引率
25.00%
发文量
48
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