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Volume Title: ICASGE2023

DOI: ICASGE-STL

Maha Hassan ; Ibrahim M. Mustafa; Sherif S Mourad; Ibrahim M. Mustafa

Cairo University

Circular hollow steel sections (CHS) are widely used as structural supports for highway signs, luminaires, and traffic signals. These are commonly designed as overhead cantilever or bridge based on the available space. The structural system to support the sign may be space truss, cantilever pole, or frame. Failure of sign supports imposes a high risk to public safety. Hence, their design should be approached with care and accuracy. A circular splice connection is typically used to connect different parts of the structure. It consists of upper and lower circular plates welded to the CHS column. Stiffeners are used to strengthen the connection between circular plate and pipe. In this research, different alternatives for this connection are investigated. This is followed by a series of experimental tests to investigate the effect of lateral loads on circular splice connection considering different parameters including connection configurations, use of internal ring stiffeners, and concrete filling. The experimental program includes a new proposed connection configuration. The control samples consist of two identical circular hollow sections connected through the circular splice connection. Test set-up was set such that splice connection is subjected to shear and flexure to simulate a cantilever sign support. Results showed that circular splice connection can fail due to many reasons including insufficient thickness of circular end plates, buckling of elements, and improper detailing. Load-displacement curves for the different tested cases are investigated. It was found that the proposed connection configuration resulted in an increase in ultimate connection load by percentages reaching 12%.

Splice; Connection; Hollow section; steel; Concrete filling; Lateral load

Steel Structures (STL)