Determination of Second-Order Effects and Design for Stability Using the Drift Limit

Authors

  • Rafael Sabelli
  • Lawrence Griffis
  • Louis F. Geschwindner

DOI:

https://doi.org/10.62913/engj.v58i3.1179

Keywords:

stability design, drift limit, second-order analysis, amplifier

Abstract

Buildings for which second-order effects are significant are often governed by drift limits. Amplifier-based approximate second-order analysis, as presented in AISC Specification Appendix 8 (2016), typically utilizes factors based on first-order drift, for which a preliminary design and an analysis are required. This paper derives equations for the amplifier used in approximate second-order analysis, B2, based on the second-order drift. Upper-bound values of amplifiers based on the drift limit can thus be determined in advance of design, eliminating the need for iteration and simplifying the design process; these values are not excessively conservative for drift-governed designs.

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Published

09/30/2021

How to Cite

Sabelli, R., Griffis, L., & Geschwindner, L. F. (2021). Determination of Second-Order Effects and Design for Stability Using the Drift Limit. Engineering Journal, 58(3), 185–196. https://doi.org/10.62913/engj.v58i3.1179

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