The Structural Engineer > Archive > Volume 66 (1988) > Issues > Issue 16 > False Mechanisms in Elastic-Plastic Analysis
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False Mechanisms in Elastic-Plastic Analysis

Many low-rise steel frames are designed in practice on the basis of plastic theory. This factor is recognised by the purveyors of computer software, and programs for the plastic analysis and design of plane frames are proliferating. There are evident advantages in offering elastic-plastic analysis as an item on the menu, and some packages on the market now do this. However, there is a fundamental problem in elastic-plastic analysis of which the profession should be aware. The writer, and no doubt other readers of The Structural Engineer, would be interested to know whether any of the programs that are currently on commerical offer incorporate a solution. The problem in question concerns the ‘false mechanism’. Professor J.M. Davies