Structural Performance of CHS Joints with Double Brackets: Analysis and Case Study

Textile membranes are widely used in architecture for their aesthetic and structural efficiency. They are typically fixed to circular hollow sections (CHS) via cables and welded steel brackets. Often, multiple brackets are employed to support the forces exerted by the membrane. However, the local stresses generated in these joints are not well-defined in international standards. This study investigates stress distribution and characteristics near welded bracket connections. The membrane structure of a newly constructed stadium in Egypt’s New Capital serves as the primary motivation for this research. Numerical finite element modeling is utilized to analyze the stresses and deformations in these joints, verified by experimental data. The study examines various parameters, including the spacing of brackets in the longitudinal and transverse direction, bracket thickness and the diameter-to-thickness ratio of CHS columns. A proposed simplified design formula is introduced to account for these factors. Finally, the case study for stadium façade column supporting membrane is presented in comparison with the studied cases.