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首页> 外文期刊>Journal of Composites for Construction >Fire Behavior of Thin CFRP Pretensioned High-Strength Concrete Slabs
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Fire Behavior of Thin CFRP Pretensioned High-Strength Concrete Slabs

机译：薄CFRP预应力高强度混凝土板的防火性能

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摘要

More sustainable precast concrete structural elements are emerging from the research community utilizing high-strength, self-consolidating fiber-reinforced concrete (HPSCC) reinforced with noncorroding prestressed carbon-fiber-reinforced polymer (CFRP). An example of this is a new type of precast CFRP pretensioned HPSCC panel intended as load-bearing beams or columns for use in building envelopes. Such elements have recently been applied to architectural facade elements in Europe. A key issue in the implementation of these elements as load-carrying members in buildings is demonstrating satisfactory performance in fire. It is well known that the bond between FRP reinforcing bars and concrete deteriorates at elevated temperatures. It is also known that high-strength concrete is susceptible to explosive spalling when subjected to fire. Reductions in FRP reinforcement tensile and bond strength during fire, effects on the load-bearing capacity of prestressed concrete structures, and the explosive spalling response of HPSCC during fire all remain largely unknown. This paper provides insights into the fire behavior of CFRP prestressed HPSCC slabs through an experimental study on thin slabs exposed to a standard fire while subjected to sustained service loads. It is shown that the fire resistance of these elements is governed by fire-induced spalling or, if spalling is prevented by the use of high dosages of polypropylene microfibers in the concrete, by thermal splitting-crack-induced bond failure of the CFRP tendons in their prestress transfer zone. Neither reductions in tensile strength of the tendons nor reductions in bond strength due to resin softening at high temperature appeared to play critical roles for the tests described in this paper. Key areas for future research are highlighted.
机译：越来越多的可持续预制混凝土结构构件正在研究领域中出现，它们采用了高强度，自固结的纤维增强混凝土（HPSCC），并由不腐蚀的预应力碳纤维增强聚合物（CFRP）增强了强度。这样的一个例子是一种新型的预制CFRP预应力HPSCC面板，旨在用作建筑围护结构的承重梁或柱。此类元素最近已在欧洲应用于建筑立面元素。在建筑物中作为承重构件实施这些要素的关键问题是证明其在火灾中的表现令人满意。众所周知，FRP加强筋和混凝土之间的粘结在高温下会变差。还已知，高强度混凝土在遭受火灾时易发生爆炸剥落。火灾期间FRP增强抗拉强度和粘结强度的降低，对预应力混凝土结构的承载能力的影响以及火灾期间HPSCC的爆炸剥落响应都仍是未知数。本文通过对承受持续服务负荷的标准火情的薄板进行实验研究，提供了CFRP预应力HPSCC板的防火性能的见解。结果表明，这些元素的耐火性是由火灾引起的剥落控制的，或者，如果通过在混凝土中使用高剂量的聚丙烯超细纤维来防止剥落，则由CFRP筋的热裂裂缝引起的粘结破坏来控制。他们的预应力传递区。在高温条件下，由于树脂的软化，腱的抗拉强度的降低或粘结强度的降低均未对本文所述的测试起关键作用。突出了未来研究的关键领域。

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