Zhang, Chengcheng2023-04-262023-04-2620232023-04-26http://hdl.handle.net/1828/14993This paper presents a study to evaluate the effective geometric property approach in AISC 360-22 for design of welds in circular hollow section (CHS)-to-CHS moment T-connections under in-plane bending. Experimental data from previous full-sized connection tests is used to verify a finite element (FE) modelling approach for weld-critical connections. A subsequent FE parametric study, including 137 fillet and partial-joint-penetration groove welded CHS-to-CHS connection models, is performed to cover wide ranges of nondimensional design parameters: branch-to-chord diameter ratio (0.4 to 1.0), branch-to-chord thickness ratio (0.2 to 1.0), and chord slenderness ratio (10 to 50). New formulae in recent research for calculation of the weld effective elastic section modulus for in-plane bending are evaluated, and modifications are proposed. The proposed modifications provide more accurate predictions of weld strength yet still achieve sufficient safety margins.enAvailable to the World Wide WebHollow structural sectionsCircular hollow sectionsFinite element analysisFillet weldsGroove weldsConnectionsEffective geometric propertiesThesis