Bridges

Transport for New South Wales (TfNSW) interfaces with multiple states via a network of major highways and subsidiary roads, predominantly linked by road bridges. These bridges serve as crucial conduits for facilitating interstate transportation, particularly for heavy vehicles. Maintaining these bridges in good condition is of critical importance for the state, assets managers and the road user. In the Southwest region of NSW, which borders Victoria, this paper focuses on two key border bridges which span over the Murray River: Heywood Bridge (B07331) in Wodonga and Mulwala Bridge (B05819) in Mulwala.

Heywood Bridge, built around 1984, exhibits significant concrete deterioration, spalling, and exposed reinforcement on the bridge parapets and planks. Cracks are also prevalent on the plank soffits. On the other hand, Mulwala Bridge, originally constructed in 1919 with subsequent extensions, faces challenges like deteriorating beam ends and headstocks in the simply supported spans. Concrete beams and pier headstocks around the seated areas display cracks and severe spalling.

Comprehensive structural inspections have identified common deterioration patterns near the beam supports and headstocks in both cases. While both assets remain safe and operational, an action plan has been proposed, encompassing strengthening and rehabilitation measures aimed at ensuring the continued safe functionality of these critical bridges. To oversee this initiative, a robust monitoring system has been implemented until the completion of rehabilitation efforts, focusing on maintaining the load-bearing capacity suitable for heavy vehicular traffic.

This paper aims to provide valuable insights to bridge asset managers tasked with overseeing similar conditions, aiding in effective bridge management and maintenance practices.