Strain localization and its impact on the ductility of reinforced concrete slabs containing welded wire reinforcement

被引:22
作者
Gilbert, RI [1 ]
Smith, ST
机构
[1] Univ New S Wales, Dept Civil & Environm Engn, Sydney, NSW, Australia
[2] Univ Technol Sydney, Fac Engn, Ctr Built Infrastruct Res, Sydney, NSW 2007, Australia
关键词
ductility; failure mode; reinforced concrete slabs; strain localization; welded wire fabric;
D O I
10.1260/136943306776232837
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Welded wire fabric (WWF) is commonly used in reinforced concrete (r.c.) slabs. WWF is classified in Australia as Class L or low ductility reinforcement and, as such, the characteristic strain at peak stress (termed the uniform elongation) is not less than 0.015 and the ratio of tensile strength to yield stress (0.2% proof stress) is not less than 1.03. A r.c. slab containing low ductility steel usually fails in bending by fracture of the tensile reinforcement at the critical section, well before the concrete in the compression zone becomes overstressed, and the conventional understanding of ductile under-reinforced flexural failure is not valid. The failure is brittle and results ill complete collapse of the span, often with little or no warning. This paper explores the collapse load behaviour of slabs containing WWF, highlighting the great significance of strain localization in lightly reinforced slabs and its adverse impact on ductility. The results of tests on several simply-supported and continuous one-way slabs reinforced with WWF are used to illustrate the discussion.
引用
收藏
页码:117 / 127
页数:11
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