Mechanical properties of heat-treated high strength steel under fire/post-fire conditions

被引：199
作者：
Chiew, S. P. [1 ]
Zhao, M. S. [1 ]
Lee, C. K. [1 ]
机构：
[1] Nanyang Technol Univ, Sch Civil & Environm Engn, Singapore 639798, Singapore
来源：
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH | 2014年 / 98卷
关键词：
Mechanical properties; Heat-treated high strength steel; Elevated temperatures; Post-fire; Characteristic strength reduction factors; ELEVATED-TEMPERATURES; STRUCTURAL-STEEL; COLUMNS; BEHAVIOR;
D O I：
10.1016/j.jcsr.2014.02.003
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Heat treated high strength steel (HSS) has attracted more and more applications in both on-shore and off-shore structures. According to the classical theories of metallurgy, the hardening effects in the microstructures that grant HSS its high strength may be weakened or eliminated by heat. Structures built using such materials may behave differently after they are heated and cooled down (e.g. during and after a fire situation). This experimental study investigated the mechanical properties of reheated, quenched and tempered (RQT) HSS plate manufactured to grade S690 at elevated temperatures as well as its residual strength after heating and cooling down. It is found out that while RQT-S690 HSS showed good resistance to low temperature (below 400 degrees C) heating, serious deterioration in strength would occur at higher temperatures and its post-fire mechanical properties are different from those of traditional hot-rolled normal strength steels. (C) 2014 Elsevier Ltd. All rights reserved.
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页码：12 / 19
页数：8
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