Dr Tian Sing Ng
Engineering Manager, BOSFA Pty Ltd
Advanced Manufacturing & Design Centre
(NOT Melbourne Uni)
Swinburne University Main Campus
461 Burwood Road, Hawthorn
Application and research in steel fibre reinforced concrete (SFRC) has a history of more than 50 years and its adoption in Australian practice is rapidly developing. Structural steel fibre reinforced concrete applications differ mainly from well-known fibre applications like floors and pavements. In structural applications, steel fibres are the main or the secondary reinforcement to take up bending moments and the shear stresses. In March 2017 the Australian Standard for the design of Concrete bridges was released (AS5100.5); this is the first standard in Australia, and one of the few national standards in the world, to include design procedures for SFRC in a comprehensive way. It is well established that the strength of unreinforced concrete in tension reduces quickly to zero after cracking. In SFRC the fibres are capable of bridging cracks and transmitting tensile force across them to enhance the post-cracking tensile behaviour. Steel fibres transfer tensile forces across cracks similar to rebar reinforcement. This property can be utilised both in Serviceability Limit State and Ultimate Limit State. However, the residual tensile strength due to the effect of the steel fibres typically decreases with increasing crack opening. This presentation presents some basic principles governing the structural design of SFRC. Starting from classification of various types of steel fibres, which have profound effect on the performance of concrete structures, the simple constitutive models were presented, allowing engineer and designer to design with SFRC. Numerous steel fibre reinforced concrete structural application projects have been carried out in Australia and abroad. A few of them will be presented, giving insight information on where steel fibre only reinforcement and combined steel fibre and conventional reinforcement were used.
Dr Tian Sing Ng is BOSFA Dramix Engineering Manager. Tian holds a PhD from the University of New South Wales with specific area of technical expertise in steel fibre reinforced concrete and concrete technology. Tian has more than 10 years of professional experience as owner engineer, engineering consultant and researcher. Tian is a Chartered Professional Engineer, a visiting research fellow at Curtin University in Western Australia, National Councillor of Concrete Institute of Australia and Deputy Chair of Engineers Australia Western Sydney Region. In addition to BOSFA representation in the new Australian Standard AS5100.5 and AS3600 for steel fibre reinforced concrete, Tian is also a member of the BD02-002 Committee reviewing Sections 3 & 4 of Australian Standard AS 3600 and a member in the Concrete Institute of Australia Durability Technical Committee.
A tour of the Swinburne Smart Structures lab is available after the presentation.
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