Computational Mechanics and Design Group

Department of Civil & Structural Engineering

Half Day Workshop: The Yield-line Method for Concrete Slabs: Automated at Last.


26/02/2015 - 14:00 to 17:00


Prof. Matthew Gilbert (CMD), Dr Angus Ramsay (Ramsay Maunder Associates), Dr Jon Shave (Parsons Brinckerhoff), Dr Tom Pritchard (LimitState)


Institution of Structural Engineers Headquarters, 47-58 Bastwick Street, London, EC1V 3PS

About the event

This free to attend afternoon workshop is designed to communicate to engineers a recent breakthrough in concrete slab analysis: following research in the CMD research group, the well known 'yield-line' method for concrete slabs has finally been systematically automated.

Benefits of the yield-line method are that it will often identify additional reserves of strength when applied to the analysis of existing slabs, and to highly economic slabs when used in design. The term 'yield-line' was first coined in the very first issue of The Structural Engineer, way back in 1923, but in recent times the method has eluded systematic automation, reducing its attractiveness in our modern computer age. At the event, details of the new automated method - which is conceptually very simple - will be briefly outlined. The method will then be used to determine the critical failure mechanism and associated collapse load for a wide range of benchmark and 'real world' problems. A complementary lower bound analysis tool will also be briefly outlined, and practical scenarios where plastic methods of analysis can prove particularly useful will be described.

Also, to ensure that structural engineers can take advantage of the breakthrough, University of Sheffield spin out company LimitState has now developed the software program, LimitState:SLAB. This software allows practical slabs with real-world geometries and loading conditions to be analysed quickly and easily. The event will serve as the 'launch' event for the software, and will enable its application to various benchmark and real-world problems to be clearly demonstrated.

Presentation slides now available - see links below.