Prediction of fire spalling behaviour of fiber reinforced concrete

IF 1.8 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY
Jingtai Jiang, Ming Wu, M. Ye
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引用次数: 0

Abstract

Fire spalling prediction of fiber reinforced concrete containing polypropylene (PP) fiber and steel fiber at elevated temperature is a challenging problem. The conventional methods such as FEM and DEM are difficult to deal with the problem as a result of complicate coupling mechanism of polypropylene (PP) fiber and steel fiber in concrete. To this end, two artificial neural network (ANN) models, one (ANN1) is on the basis of concrete mix study and the other one (ANN2) is based on compressive strength study, are introduced in current study to assess the resistance of concrete to explosive spalling. A number of 321 and 318 test data gathered from literature are utilized to train the two proposed ANN models. Twenty-four concrete mixes (96 groups), i.e., seven plain concrete (PC) mixes, four high performance concrete (HPC) mixes reinforced with PP fiber, three ultra-high-performance concrete (UHPC) with reinforced PP fiber and ten ultra-high-performance concrete (UHPC) mixes reinforced with PP and steel hybrid fiber are designed and tested to validate the accuracy of the two models. It demonstrates that ANN1 and ANN2 can achieve a predictive accuracy of 89.6% and 84.4% for the explosive spalling respectively, which indicates the feasibility of proposed ANN models for predicting explosive spalling threat of the hybrid fiber reinforced concrete.
纤维混凝土火灾剥落行为的预测
含聚丙烯(PP)纤维和钢纤维的纤维混凝土在高温下的火灾剥落预测是一个具有挑战性的问题。由于聚丙烯(PP)纤维与钢纤维在混凝土中的耦合机理复杂,传统的有限元法和离散元法难以解决这一问题。为此,在目前的研究中,引入了两个人工神经网络(ANN)模型,一个是基于混凝土配合比研究的人工神经网络模型(ANN1),另一个是根据抗压强度研究的人工神经元网络模型(ANN2),来评估混凝土的抗爆炸剥落性能。利用从文献中收集的321和318个测试数据来训练所提出的两个ANN模型。设计并测试了24种混凝土混合物(96组),即7种素混凝土混合物、4种聚丙烯纤维增强高性能混凝土混合物、3种聚丙烯纤维超高性能混凝土和10种聚丙烯和钢混合纤维增强超高性能混凝土混合物,以验证两个模型的准确性。结果表明,ANN1和ANN2对爆炸性层裂的预测精度分别为89.6%和84.4%,这表明所提出的ANN模型预测混合纤维混凝土爆炸性层剥落威胁的可行性。
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来源期刊
Magazine of Concrete Research
Magazine of Concrete Research 工程技术-材料科学:综合
CiteScore
4.60
自引率
11.10%
发文量
102
审稿时长
5 months
期刊介绍: For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.
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