Fire Performance of FRP-RC Flexural Members: A Numerical Study.
Fire Performance of FRP-RC Flexural Members: A Numerical Study.
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FRP-RC 弯曲构件的防火性能：数值研究。
DOI：
10.3390/polym14020346
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发表时间：
2022-01-17
期刊：
影响因子：
5
通讯作者：
Yang J
中科院分区：
文献类型：
--
作者：
Duan D;Ouyang L;Gao W;Xu Q;Liu W;Yang J
纤维增强聚合物（FRP）筋越来越多地被用作混凝土结构建设中钢筋的替代品，主要是由于其优异的耐久性特性。当FRP筋混凝土（简称FRP- rc）构件用于室内应用（如建筑物）时，FRP- rc构件的防火性能需要适当设计以满足安全要求。FRP筋与周围混凝土之间的粘结性能决定了两种材料之间的复合作用以及FRP- rc受弯构件在火灾下的相关结构性能。然而，文献中缺乏可靠的数值模型来量化高温下FRP筋与混凝土界面粘结退化对FRP- rc受弯构件防火性能的影响。本文提出了火灾下FRP- rc受弯构件的三维（3D）有限元（FE）模型，并适当考虑了高温下FRP筋与混凝土界面的温度相关粘结退化。此外，在传热分析中考虑了混凝土和FRP筋的热性能，以预测FRP- rc构件在火灾下的截面温度。在有限元模型中，适当地定义了混凝土和FRP筋在高温下的力学性能和本构规律，以及它们之间的粘结退化，从而准确地预测了FRP- rc构件在火灾下的整体和局部结构响应。通过比较有限元预测（火灾暴露时的温度和跨中挠度响应）和文献中报道的全尺寸火灾试验结果，所提出的有限元模型得到了验证。然后利用验证的有限元模型研究了粘结退化对火灾下FRP-RC构件整体和局部结构响应的影响。结果表明，需要考虑温度相关的粘结退化，以实现对失效模式和挠曲响应的准确预测。
Fiber-reinforced polymer (FRP) bars are increasingly used as a substitute for steel reinforcements in the construction of concrete structures, mainly due to their excellent durability characteristics. When FRP bar-reinforced concrete (referred to as FRP-RC for simplicity) members are used in indoor applications (e.g., in buildings), the fire performance of FRP-RC members needs to be appropriately designed to satisfy safety requirements. The bond behavior between the FRP bar and the surrounding concrete governs the composite action between the two materials and the related structural performance of the FRP-RC flexural member that will be affected when exposed to fire. However, there is a lack of reliable numerical models in the literature to quantify the effect of bond degradations of the FRP bar-to-concrete interface at high temperatures on the fire performance of FRP-RC flexural members. This paper presents a three-dimensional (3D) finite element (FE) model of FRP-RC flexural members exposed to fire and appropriately considers the temperature-dependent bond degradations of the FRP bar-to-concrete interface at high temperatures. In addition, the thermal properties of concrete and FRP bars are considered in the heat transfer analysis to predict the cross-sectional temperatures of the FRP-RC members under fire exposure. In the FE model, the mechanical properties and constitutive laws of concrete and FRP bars at high temperatures in addition to the bond degradations between them have been properly defined, thereby accurately predicting the global and local structural responses of the FRP-RC members under fire exposure. The proposed FE model has been validated by comparing the FE predictions (both temperature and midspan deflection responses during fire exposure) and the full-scale fire test results reported in the literature. The validated FE model is then used to study the effects of bond degradations on the global and local structural responses of the FRP-RC members under fire exposure. It is proved that the temperature-dependent bond degradations need to be considered to achieve accurate predictions of the failure mode and deflection responses.
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