Structural behaviour of FRP reinforced concrete slabs in fire
Structural behaviour of FRP reinforced concrete slabs in fire
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DOI：
10.1016/j.engstruct.2020.111058
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发表时间：
2020-10-15
影响因子：
5.5
通讯作者：
Nigro, Emidio
中科院分区：
文献类型：
--
作者：
Bilotta, Antonio;Compagnone, Alberto;Nigro, Emidio
钢筋混凝土(RC)结构的耐久性是工程师在设计过程中要解决的一个基本问题。一种相对较新的结构型式用纤维增强聚合物(FRP)取代了传统的钢筋，纤维增强聚合物是一种不容易腐蚀的材料。另一方面，这些材料也有缺点，其中包括施工问题(FRP钢筋不容易在现场弯曲)和对火灾的机械敏感性。多项研究表明，高温会导致基质分解(即纤维周围的树脂)，从而阻止FRP筋与混凝土之间的剪切传递。作者建立了一个三维有限元模型来研究第二个问题，同时考虑了几何和材料的非线性。基于ISO834标准火灾下FRP-RC玻璃板的试验结果验证有限元模型后，通过改变(I)钢筋类型(即钢、GFRP、CFRP)、(Ii)防止热膨胀的冗余边界条件和(Iii)跨数和跨度，对有限元模型进行参数分析。
The durability of reinforced concrete (RC) structures is a fundamental issue that engineers address in design procedures. A relatively new structural typology replaces traditional steel reinforcing bar with fiber reinforced polymers (FRP), which is a material less prone to corrosion. On the other hand, these materials have disadvantages, among which construction issue (the FRP rebar cannot be easily bent on site) and mechanical susceptibility to fire. Several studies have shown that high temperatures cause the matrix decomposition (i.e. the resin that surrounds the fibers), which precludes the shear transfer between FRP bars and concrete. Authors built a 3D finite element model to investigate this second issue, considering both geometric and material non-linearities. Once the finite element model was validated based on the outcomes of experimental tests performed on glass FRP-RC slabs exposed to ISO834 standard fire, a parametric analysis has been carried out by varying (i) the reinforcement type (i.e. steel, GFRP, CFRP) (ii) redundant boundary conditions that prevent the thermal expansion and (iii) number and length of the spans.