Reliability-based development of torsional strength equations for the CSA S16 Standard

Greene, Aaron (2021) Reliability-based development of torsional strength equations for the CSA S16 Standard. Masters thesis, Memorial University of Newfoundland.

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Abstract

Steel structures are designed to specific governing design codes which have incorporated reliability parameters that predetermine the required target reliability and margin of safety depending on which country the structure is engineered. The approved steel design codes ensure each structure is designed with the same quality, recommended loading conditions and safety standards for the design life of the structure. In Canada steel structures are governed by the Canadian Standards Association (CSA) and designed to CAN/CSA S16-19 – Design of Steel Structures [1]. The current Canadian steel design standard (CSA S16-19) gives no specific guidance on methodology with respect to torsional design. This thesis proposes a reliability-based method that, subject to further research and approval by experts in the field, could allow the adoption of strength formulas from other sources for use alongside the CSA S16 Standard while maintaining the desired target reliability. A series of reliability analyses are performed first to verify the target reliabilities of both the CSA S16 Standard and the AISC 360 specification. Then, an iterative reliability-based approach is used to calibrate the proposed strength formulas in accordance with the desired target reliability of the CSA S16 standard. Updated resistance factors are then recommended for use with the AISC 360 torsional strength formula for round and rectangular HSS sections so that they can be adopted for use by the CSA S16 standard while maintain the appropriate target reliability index.

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