Test of Slip-Critical Connection System with Embedded Nuts for Aluminum Bridge Application

Abstract

Aluminum is a common material in construction and relatively new in infrastructure, such as bridges. One advantage of aluminum is the production of complex geometry extrusions, which optimizes the mass of components. In order to assemble aluminum deck panels, a mechanical assembly method must be used. One solution is to access the fasteners (nuts) in closed areas of the extrusions. As was found, to embed the nuts in an aluminum flat bar, the goal was to assure non-slip grip at maximum torque and minimum fabrication cost. Full-scale physical tests were performed to verify the compliance with standardized turn-of-nut tightening requirements. The good test results will help introduce this solution in future aluminum bridge construction projects and improve bridge standards.

Keywords

• aluminum bridge
• embedded fastener
• non-slip grip
• turn-of-nut