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首页> 外文期刊>Journal of structural fire engineering >Explosive spalling of ultra-high performance fibre reinforced concrete beams under fire
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Explosive spalling of ultra-high performance fibre reinforced concrete beams under fire

机译：火灾下超高性能纤维混凝土梁的爆炸剥落

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Purpose - The purpose of the study was to investigate the spalling phenomenon in ultra-high performance fibre reinforced concrete (UHPFRC) beams on exposure to a standard fire curve (ISO 834) under a sustained load. Design/methodology/approach - The variables in this study were steel fibre dosage, polypropylene (PP) fibres and loading levels. The research investigated seven beams - three of which contained steel fibres with 2 vol.%, another three had steel fibres with 4 vol.% dosage and the seventh beam had a combination of steel fibres (2 vol. %) and PP fibres (4 kg/m~3). The beams were tested for 1 h under three loading levels (20, 40 and 60 per cent) based on the ambient temperature ultimate flexural strength of the beam. Findings - Spalling was affected by the loading levels; it exacerbated under the load level of 40 per cent, whereas under the 60 per cent load level, significantly less spalling was recorded. Under similar loading conditions, the beams containing steel fibres with a dosage of 4 vol.% spalled less than the beams with fibre contents of 2 vol. %. This was attributed to the additional tensile strength provided by the excess steel fibres. The presence of PP fibres eliminated spalling completely. Originality/value - There is insufficient research into the performance of UHPFRC beams at elevated temperature, as most studies have largely focussed on columns, slabs and smaller elements such as cubes and cylinders. This study provides invaluable information and insights of the influence of parameters such as steel fibre dosage, PP fibres, loading levels on the spalling behaviour and fire endurance of UHPFRC beams.
机译：目的-研究的目的是研究超高性能纤维增强混凝土（UHPFRC）在持续载荷下暴露于标准燃烧曲线（ISO 834）下的剥落现象。设计/方法/方法-这项研究中的变量是钢纤维用量，聚丙烯（PP）纤维和负载量。研究调查了七根梁，其中三根包含2％（体积）的钢纤维，另外三根包含剂量为4％（体积）的钢纤维，第七根梁包含了钢纤维（2％（体积））和PP纤维（4 kg / m〜3）。根据梁的环境温度极限弯曲强度，在三种载荷水平（20％，40％和60％）下对梁进行了1小时的测试。调查结果-剥落受到载荷水平的影响；在40％的负载水平下加剧了这种情况，而在60％的负载水平下，记录的剥落明显减少了。在相似的负载条件下，含有4％（体积）的钢纤维的梁比含有2％（体积）的纤维的梁散裂。 ％。这归因于过量钢纤维提供的额外拉伸强度。 PP纤维的存在完全消除了剥落。原创性/价值-对UHPFRC梁在高温下的性能没有足够的研究，因为大多数研究都集中在圆柱，平板和较小的元素（例如立方体和圆柱体）上。这项研究提供了宝贵的信息和洞察力，例如钢纤维用量，PP纤维，载荷水平对UHPFRC梁的剥落行为和耐火性的影响。

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