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首页> 外文期刊>Journal of structural engineering >Posttensioned Concrete Bridge Beams Exposed to Hydrocarbon Fire
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Posttensioned Concrete Bridge Beams Exposed to Hydrocarbon Fire

机译：被掩盖的混凝土桥梁暴露于碳氢化合物火

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This paper presents the experimental and numerical investigations of two types of bonded posttensioned concrete bridge beams under hydrocarbon fire, including the box and tee beams. The factors considered included the load level and fire exposure duration. Six specimens were tested. The surface temperatures, strand temperatures, and midspan deflection of specimens were measured. Results showed that the box beam under service load could sustain fire for 184 min, while the tee beam could only endure for 105 min before collapse. The overloaded box beam could withstand fire for around 165 min. For exposure to fire for 90 min followed by cooling down to ambient temperature, the box and tee beams lost 11% and 38% of load-carrying capacity, respectively. Postfire observation also showed severe spalling at the midspan and support regions of the specimens. The test results were also used to validate the finite element models established for predicting the thermal and structural responses of the bridge beams under hydrocarbon fire. (C) 2020 American Society of Civil Engineers.
机译：本文介绍了碳氢化合物火灾下两种粘结的壁重桥梁的实验和数值研究，包括箱和三通梁。考虑的因素包括负载水平和火灾曝光持续时间。测试了六种样品。测量样品的表面温度，链温度和半轴偏转。结果表明，箱梁下的服务负荷可以维持火灾184分钟，而TEE梁只能在坍塌之前恢复105分钟。过载的盒子梁可以承受大约165分钟的火灾。为了暴露于火灾90分钟，然后冷却至环境温度，盒子和三通梁分别损失了11％和38％的承载能力。后火灾观察还显示出在模型的严重剥落和标本的支持区域。测试结果还用于验证建立的有限元模型，用于预测碳氢化合物火灾下桥梁梁的热和结构响应。 （c）2020年美国土木工程师协会。

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