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Concrete In Australia : September 2014
TECHNICAL NOTE 20 Concrete in Australia Vol 40 No 3 In the theory of plasticity for complex structures like slabs, exact solutions are rare, and thus we mostly have to use upper or lower bound values of the theoretical collapse load. For slabs the yield-line theory is used for upper bounds and the strip method for lower bounds. The new bimoment proposed by Colin Gurley does not belong solely to one or the other of these types. In some ways it can be said to give lower bounds, and most of the examples given in the book can be regarded as such. As the bimoment solutions do not automatically fulfil the equilibrium conditions at each point the solutions are however no strict lower bound solutions. The fact that virtual work equations for large slab parts are studied also shows that the method may be regarded as a kind of upper bound solution. The bimoment method thus can be looked upon as a new and original way of applying the theory of plasticity to slab design, where use is made of both upper and lower bound principles. A very noticeable property of the bimoment method is the simplicity of the numerical calculations for many cases met with in everyday design work. Therefore, it can be remembered as a useful tool in design offices. Lund, Sweden February 1980 LESS THAN 8 WEEKS TO GO TO SUBMIT YOUR ABSTRACT! With only 8 weeks to go until the abstract submission deadline don’t miss out on your chance to be a part of a brilliant program. Come and join international and national keynote speakers and connect face to face and share your innovative and interesting ideas! To submit an abstract or find out more information, scan the QR code or visit www.concrete2015.com.au SPONSORSHIP AND EXHIBITION We are delighted to announce Reid as the official Conference Partner for Concrete 2015! Reid is an extremely well known organisation in Australia and its support of the conference and the concrete industry is greatly appreciated. For all our major partners, sponsors and supporters, Concrete 2015 will provide the perfect platform to position your brand before a leading and highly sought-after audience from the concrete industry. To express your interest in the Conference please contact the Concrete 2015 Sponsorship Manager, Kirsty Winning on +61 29 265 0776 or alternatively email email@example.com. Venue: Pullman Albert Park, Melbourne Web: www.concrete2015.com.au www.RILEM2015.com concrete 2015 Dates: 30 August - 2 September 2015 Email: firstname.lastname@example.org Hosts: concrete-2015.indd 1 1/08/14 11:15 AM A technical note on bimoment method Following the Concrete Institute of Australia’s recent seminars on topics related to plastic design of concrete structures, a letter from Prof Arne Hillerborg (Lund Institute of Technology, Sweden) on the bimoment method is included below for interested readers. Further details of the method are available in the below listed references. References: Gurley, C.R . (1979) Bimoment equilibrium of finite segments of Hillerborg plate. Magazine of Concrete Research: Vol. 31, No. 108. Discussions of this paper published in Magazine of Concrete Research: Vol. 32, No. 112, 1980. Gurley, C.R . (1980) The First Bimoment Report: Plastic Design of Slabs. Auckland University School of Engineering Research Report No. 210. Gurley, C.R . (1983) Bimoment design of some rectangular slabs. Magazine of Concrete Research: Vol. 35. No. 122. Discussions of this paper published in Magazine of Concrete Research: Vol. 36, No. 126, 1984. Gurley CR (2009) Plastic yield-line analysis of torsion-free two-way and flat slabs. Australian Journal of Structural Engineering, online. CIA 40-3 FINAL.indb 20 CIA 40-3 FINAL.indb 20 26/08/14 9:18 AM 26/08/14 9:18 AM