Portal and cantilever sign/signal gantries – Inspection and retrofitting

This paper presents an experimental work about the condition and maintenance ratings of portal and cantilever sign gantries in Portugal, in which an extensive inspection campaign (about 1500 structures) was carried out. According to the results obtained, approximately 35% of the sign structures present insufficient condition rating, requiring priority repair works. The critical anomalies registered were lack of tightening/absence of connection elements, incorrect geometry of connection system and structural collapse of steel plates and profiles. Additionally, an inventory campaign was carried out, allowing to perform a structural design verification of approximately 80% of the inspected structures. Based on the structural analysis performed, a significant part of the existing portal and cantilever frames present structural strengthening or replacement needs and, consequently, these of structures require monitoring actions.