Abstract
One of the main results of increasing globalization is that nowadays design, fabrication and erection of steel structures can take place at different locations potentially separated by several thousand kilometres. As a consequence, owners might require the use of widely accepted steel design codes and designers should therefore be familiar with alternative specifications that may be substantially different from one another.The paper deals with unbraced steel frames, and presents a comparison between the rules adopted by the European and United States design provisions. After a brief discussion on the key features of both codes, attention is focussed mainly on the different approaches to structural analysis. Furthermore, the results of a parametric study are described, highlighting the differences associated with the permissible design alternatives in terms of load carrying capacity. Reference is made to planar frames with differing geometry, load conditions, imperfection modelling and degree of the rotational stiffness of beam-to-column joints. Finally, Appendix A proposes a benchmark example reporting all details associated with the application of the design approaches under consideration.
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