ClientMCM GLOBAL, S.A.
BackgroundThe Bridge of the Americas connects the Americas across the Panama Canal on International Highway 1. Completed in 1962, the 5,427-foot-long bridge features two approach spans and a central tied-arch span over the main canal waterway. It is supported on thirteen concrete piers and end abutments. The steel superstructure consists of two parallel, long-span trusses 42 to 139 feet in height. A nominal 7-inch-thick and 58-foot-wide concrete deck is supported on longitudinal stringers that, in turn, bear on floor beams. Suspended sections of the steel truss system are connected at six locations with a total of twenty-four steel transfer pins ranging in diameter from 9 to 19-5/8 inches.
SolutionWJE bridge engineers performed the visual inspection of the steel superstructure and reinforced concrete piers using industrial rope access techniques (climbing, rappelling, and ascending). Fracture-critical members and their connections were visually inspected at arm's length for evidence of cracking, corrosion, and other indications of distress. The piers were sounded for delaminations. An assessment of the transfer pins included visual observation of pin surfaces and comprehensive nondestructive ultrasonic examination of inaccessible internal pin-hanger assemblies.
Areas within the bridge that exhibited distress or deterioration—primarily due to corrosion, fatigue cracking, and initial concrete shrinkage—were examined in depth and the findings incorporated into the planned rehabilitation of the bridge.