Mechanical behaviour of ultra-high strength concrete at elevated temperatures and fire resistance of ultra-high strength concrete filled steel tubes
Mechanical behaviour of ultra-high strength concrete at elevated temperatures and fire resistance of ultra-high strength concrete filled steel tubes
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DOI：
10.1016/j.matdes.2016.05.050
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发表时间：
2016-08
影响因子：
8.4
通讯作者：
M. Xiong;J. Liew
中科院分区：
文献类型：
--
作者：
M. Xiong;J. Liew
本文介绍了高温下超高强度混凝土的力学性能试验研究，并在此基础上提出了一种预测超高强度混凝土填充管状柱耐火性能的简单计算方法。室温下，UHSC的筒体抗压强度为166 N/mm2。在800℃温度下测量了UHSC的抗压强度和弹性模量。然后，将其与欧洲规范2和ANSI/AISC 360-10中规定的普通/高强度混凝土的力学性能以及文献中混凝土的力学性能进行比较。结果表明，高温作用下UHSC的抗压强度和弹性模量的降低幅度普遍小于普通/高强混凝土。提出了用温度随力学性能的变化来评价钢管柱的耐火性能。在这个项目中调查的UHSC被证明在许多情况下显著提高耐火性能，这些情况在文献中有很好的记录，涉及填充普通和高强度混凝土的管状柱。
This paper introduces experimental study on mechanical behaviour of an ultra-high strength concrete (UHSC) at elevated temperatures and then a simple calculation method to predict the fire resistance of tubular column infilled with the UHSC. The cylinder compressive strength of the UHSC was 166 N/mm2at room temperature. The compressive strength and modulus of elasticity of the UHSC were measured up to 800 °C. Then the temperature-dependent mechanical properties were compared with those of normal/high strength concretes provided in Eurocode 2 and ANSI/AISC 360-10, and with those of concretes in literature. The comparisons showed that the compressive strength and elastic modulus of the UHSC were generally reduced less than those of normal/high strength concretes at the elevated temperatures. The temperature-dependent mechanical properties were proposed for evaluating fire resistance of steel tubular columns infilled with the UHSC. The UHSC investigated in this project was shown to markedly improve the fire resistance in a number of cases well documented in the literature concerning tubular columns filled with the normal- and high-strength concretes.