Ronald D. Ziemian


Ronald D. Ziemian is a professor at Bucknell University. He received his BSCE, MENG, and PhD degrees from Cornell University. In addition to authoring papers on the design and analysis of steel and aluminum structures, Ron is co‐author of the textbook Matrix Structural Analysis (Wiley, 2000), the developer of the educational analysis software MASTAN2, and the editor for the 6th edition of the Guide to Stability Design Criteria for Metal Structures (Wiley, 2010). He is the Co-Editor in Chief of Elsevier’s Journal of Constructional Steel Research. Ron is a member of AISC’s Committee on Specifications, chairs AISC’s TC3 – Loads, Analysis and Stability, and previously chaired AISC’s TG on Inelastic Analysis and Design. He also serves on the AISI and Aluminum Association Specification Committees, is active with the Steel Joist Institute, and the former chair of the Structural Stability Research Council. Ron was awarded the ASCE Norman Medal (1994), an AISC Special Achievement Award (2006), the ASCE Shortridge Hardesty Award (2013), and AISC’s TR Higgins Award (2019) for his contributions to the profession related to the stability analysis and design of metal structures


Design by Advanced Analysis – 2016 AISC Specification

Ronald D. Zieman
Department of Civil and Environmental Engineering
Bucknell University, Pennsylvania, USA

At the heart of the provisions for assessing structural stability within the American Institute of Steel Construction’s Specification for Structural Steel Buildings is the requirement that the following effects be considered: (a) flexural, shear, and axial member deformations, and all other component and connection deformations that contribute to the displacements of the structure; (b) second-order effects; (c) geometric imperfections; (d) stiffness reductions due to inelasticity, including the effect of partial yielding of the cross section, which may be accentuated by the presence of residual stresses; and (e) uncertainty in system, member, and connection strength and stiffness. Recognizing that there exists a range of possibilities for how the above effects, especially (b), (c), and (d), can be incorporated within the design process, AISC’s direct analysis method can be re-interpreted as a more general procedure. The fundamental concept is that the more behavior that is explicitly modeled within the analysis, the simpler it is to define the terms within the Specification’s design equations, and/or perhaps the fewer Specification equations that need to be checked.  In other words, the direct analysis method consists of calculating strength demands and available strengths according to a range of well-defined and fairly detailed analysis requirements. This presentation provides an overview of two logical extensions to AISC’s direct analysis method, both of which are now provided in the Specification’s Appendix 1 – Design by Advanced Analysis. In addition to the details and background of these extensions to the direct analysis method, examples that demonstrate key features of AISC’s Appendix 1 will be provided. The presentation concludes with identifying topics in research that will need to be addressed in order to expand further opportunities for design by advanced analysis.