Branch plate-to-CHS T-connections: Finite element study and design recommendations

To evaluate the suitability of current international design recommendations for transverse and longitudinal T-type plate-to-CHS connections subjected to branch plate tension or compression, a parametric numerical finite element study was undertaken. Finite element modelling and analysis techniques used in the parametric study were validated against previously tested experimental results. A total of 99 connections with varied geometric properties were modeled and analyzed using commercially available software, ANSYS. An evaluation of current CIDECT partial design strength functions (Q(u)) concluded that general conservatism and under-utilization of branch tension-only connection capacity exists. Partial design strength functions are proposed based on a regression analysis of numerical finite element results and existing international experimental data. Lower bound reduction (resistance) factors are applied to these guidelines.