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SLGAAP Phase 2 (Round 2)

Project Overview

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Nominations for SLGAAP Phase 2 Round 2 are now open, closing 8 June 2022.

Road Managers are encouraged to nominate assets under the project.

Please consider the strategic importance of your asset when applying as the following criteria will be used in selecting and prioritising the assets to receive funded assessments provided by engineering consultants.

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What's On

FAQS

A Level 2 inspection to any of the state asset inspection manuals. These types of inspections are detailed inspections where every element is inspected and systematically given a condition rating (1-4) and all major defects are systematically logged and described using a supplied template/format.

In terms of currency, an inspection needs to have been undertaken within the current inspection cycle for a structure. The recommended intervals between inspections are documented in state manuals and can vary from jurisdiction to jurisdiction and often based on the condition that the structure was in during the previous inspection.

As a guide:

  • Concrete: No more than 5 years since last inspection
  • Steel: No more than 3 years since last inspection
  • Timber: No more than 2-3 years since the last inspection

The asset assessment is undertaken by engineering consultants, who are funded through SLGAAP. Although no monetary contributions will be required from participating councils, there is a time cost to participate in an onboarding session, ad hoc progress meetings, and a completion meeting with NHVR SLGAAP Team and the engineering suppliers. A post-assessment meeting will also be required.

The key difference between a Level of Inspection Report and Tier of Assessment is purpose:

  • Inspection reports detail asset condition and maintenance.
  • Tiers of Assessment detail the asset capacity for vehicles and loads.

     Report     

 Detail
Tier 1
  • Tier 1 bridge assessments are performed using the reference vehicle technique, comparing the worst load effects of an application vehicle on a given structure compared to a  reference vehicle that would be considered suitable to travel over the structure. Key inputs to the assessment are:
  • Span Length
  • Span Continuity
  • Design Vehicle or known Acceptable Loading Configuration
  • Level 2 Structure Condition (includes design drawings fully defining all geometry and reinforcing, any material specifications used that define required material performance and as-built records – whether as-built drawings if available).
Tier 1/2D  
Tier 2

A Tier 2 bridge assessment focuses on using structural engineering principles to identify the theoretical maximum load effects the structure can withstand as governed by the material and configuration (capacity assessment). Two-dimensional analysis techniques such as a grillage analysis or a line model analysis using girder distribution factors are typically used to determine the theoretical loads from the application vehicle load case. The results of the loading analysis are then compared to a theoretical estimate of the structural capacity of each member of the bridge.

Key inputs to the assessment are:

  • As-Built Drawings (if available),
  • Component Geometries and Material Properties to construct analytical models,
  • Site Measurements (if necessary),
  • Assessment Vehicles, and
  • Level 2 Structure Condition.
Tier 3  
Level 1 Routine Maintenance Inspection (Level 1) - a visual inspection to check the overall serviceability of the structure and identify maintenance issues.
Level 2

Detailed component Condition Inspection (Level 2) - consists of a detailed report outlining the condition state of every structural component.
Level 3

Detailed Structural Engineering and Material Inspection (Level 3) - analytical analysis of a structure with suitable defect identification and investigation.

 

The SLGAAP team funds external engineering consultants to work with participating road managers. The SLGAAP team, in collaboration with the engineering consultant, will decide what tier of assessment can be completed based on the asset information available to them and submitted at time of nomination.