Spall strength of steel-fiber-reinforced concrete under one-dimensional stress state

被引：8

作者：

Zhang, Ji-ye ^{[1
,2
]}

Ren, Hui-qi ^{[2
]}

Han, Feng ^{[1
]}

Sun, Gui-juan ^{[2
]}

Wang, Xing ^{[2
]}

Zhao, Qiang ^{[2
]}

Zhang, Lei ^{[2
]}

机构：

[1] Beijing Inst Technol, Sch Mechatron Engn, 5 South Zhongguancun St, Beijing 10081, Peoples R China

[2] AMS, Inst Def Engn, PLA 3 Courtyard,Longmen Xishan Rd, Luolong Dist 471023, Luoyang, Peoples R China

来源：

MECHANICS OF MATERIALS | 2020年 / 141卷

关键词：

Hopkinson (Kolsky) bar; Steel-fiber-reinforced concrete; Spall strength; Strain rate effect; DYNAMIC TENSILE-STRENGTH; HOPKINSON PRESSURE BAR; STRAIN-RATE; NUMERICAL-ANALYSIS; CEMENTITIOUS COMPOSITES; COMPRESSIVE BEHAVIOR; IMPACT TEST; HIGH-RATES; FRACTURE; SIMULATION;

D O I：

10.1016/j.mechmat.2019.103273

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A specially designed large-scale Hopkinson bar (phi 100 mm) with hollow aluminum alloy bar as transmitted bar was used to measure the dynamic spall strength of steel-fiber-reinforced concrete (SFRC). The experimental results indicate that the steel fibers significantly enhance the spall strength of the SFRC. The enhancement of the spall strength from the steel fibers is linear with the product of the fiber influencing coefficient (alpha), the slenderness ratio (l/d), and the fiber volume fraction (V-f). Under dynamic loading, the value of alpha is higher than that observed under quasi-static loading, which is due to the enhancement of the dynamic bond strength between the fiber and the cement matrix. Furthermore, undulated fibers bring about a higher alpha than hooked fibers. Finally, an empirical formula is built to estimate the dynamic spall strength of SFRC under one-dimensional stress. The prediction was shown to be consistent with the experimental results. The steel fiber enhanced spall strength can be regarded as an important guideline in the design of high-performance concrete for improving the penetration resistance of protective structures.

引用

页数：9

共 56 条

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