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首页> 外文期刊>Journal of structural fire engineering >Unbonded Post Tensioned Concrete Slabs in Fire - Part I - Experimental Response of Unbonded Tendons under Transient Localized Heating
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Unbonded Post Tensioned Concrete Slabs in Fire - Part I - Experimental Response of Unbonded Tendons under Transient Localized Heating

机译：火灾中无粘结后张拉混凝土板-第I部分-瞬态局部加热下无粘结筋的实验响应。

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The fire-safe structural design and construction of unbonded post-tensioned (UPT) flat plate concrete structures has recently come under debate in the UK, and questions are being raised regarding the response to fire of post-tensioned concrete slabs. Related to these concerns is the real world response of continuous UPT tendons inside such structures both during and after a fire, which is largely unknown and depends on many potentially important factors which are not currently accounted for in standard fire tests. Several credible concerns exist for UPT concrete structures in fire, most notably the potential for premature tendon rupture due to localized heating which may result from a number of possible causes (discussed herein). The research presented in this paper deals specifically with the time-temperature-stress-strength interdependencies of stressed UPT tendons under localized transient heating, as may be experienced by tendons in a real UPT building in a real fire. Nineteen high temperature stress relaxation tests on UPT tendons of realistic length and parabolic longitudinal profile are reported. It is shown that localized heating of UPT tendons is likely to induce premature tendon rupture during fire, even in structures which meet the prescriptive concrete cover requirements imposed by available design codes.
机译：最近，英国对无粘结后张紧（UPT）平板混凝土结构的防火结构设计和施工进行了辩论，并且人们对后张拉混凝土板的火灾响应提出了疑问。与这些问题相关的是，在火灾期间和火灾之后，此类结构内部连续的UPT肌腱在现实世界中的反应，这在很大程度上尚不清楚，并且取决于目前在标准火灾测试中未考虑的许多潜在重要因素。对于着火的UPT混凝土结构，存在一些可信的问题，最值得注意的是，由于多种可能的原因（在此讨论），局部加热可能导致腱过早断裂。本文中提出的研究专门针对局部瞬态加热下受压UPT钢筋的时间-温度-强度-强度相互依赖性，这可能是在真实火灾中的真实UPT建筑物中的钢筋所经历的。报告了对UPT腱的实际长度和抛物线形纵剖面进行了19次高温应力松弛测试。结果表明，即使在满足可用设计规范规定的混凝土覆盖要求的结构中，UPT筋的局部加热也可能在火灾中引起筋的过早破裂。

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