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Journal of Zhejiang University SCIENCE A
ISSN 1673-565X(Print), 1862-1775(Online), Monthly
2016 Vol.17 No.5 P.366-377
Static and dynamic behavior of concrete slabs reinforced with chemically reactive enamel-coated steel bars and fibers
Abstract: In this study, the effect of steel fibers coated with chemically reactive enamel (CRE) on the system response of concrete structures with reinforcing bars has been investigated for the first time. In particular, the ultimate strength, ductility, and failure mechanism of 24 reinforced concrete slabs were experimentally characterized under static and blast loads. CRE coating applied on steel bars reduced the crater area of slabs under blast loads by up to 20%; it slightly increased the strength of slabs and significantly reduced the strength degradation of slabs when increasingly deflected under static loads, making the slabs more ductile. CRE coating applied on steel fibers increased the strength of slabs by up to 16% under static loads. The influence of CRE coating applied on both steel fibers and bars may be taken into account by introducing a coating factor in the range of 0.57<β<1.0 in the American Concrete Institute (ACI) development length equation.
Key words: Chemically reactive enamel (CRE) coating, Blast load, Fracture pattern, Steel fibers
创新点：1. 对活性瓷釉涂层钢筋混凝土板的动、静力学性能进行系统研究；2. 探究活性瓷釉钢纤维在混凝土结构中的作用机理。
方法： 1. 通过对活性瓷釉涂层钢筋混凝土板进行爆炸实验（图3），揭示活性瓷釉涂层钢筋混凝土结构的动力破坏特征（图5和6）；2. 通过对活性瓷釉涂层钢筋混凝土板进行静力实验（图4），研究在"点"荷载和"线"荷载作用下混凝土板的力学性能；3. 通过分析钢纤维在钢筋混凝土结构中的传力机理，提出活性瓷釉涂层钢纤维在钢筋混凝土结构中的设计方法（图13）。
结论：1. 活性瓷釉涂层能够显著改善钢筋在混凝土结构中的传力性能；在动力荷载作用下，涂层钢筋混凝土结构的破坏程度明显减轻。2. 活性瓷釉涂层能够显著改善钢筋混凝土结构的变形特性，大大增强其耗能能力。3. 采用活性瓷釉涂层的钢纤维，其纤维长度可适当减小。
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DOI:
10.1631/jzus.A1500301
CLC number:
TH161.12
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On-line Access:
2016-05-04
Received:
2015-11-04
Revision Accepted:
2016-02-26
Crosschecked:
2016-04-07