Asset Management Plan for Bridges

1. Introduction

1.1 Scope

The bridges asset class comprises;

1.2 Asset Hierarchy

1.3 Quantative Data

As at June 2011 there were 134 bridges & culverts recorded in the bridge register.

2. Service Levels

2.1 Strategic/Community Service Levels

2.2 Maintenance Service Levels

3. Future Demand

3.1 Future requirements associated with corporate plans or operational plans

3.2 Known or possible areas for expansion

3.2.1 New Subdivisions

3.2.2 Population Growth

3.2.3 Changes in Land Use

3.2.4 Changes to Government Policy & Regulations

3.3 Asset classes and potential acquisition dates

3.4 Cost estimates

3.5 Impact of future demand on service levels, asset lifecycle and financial considerations

3.6 Technological Change Forecast

3.6.1 Energy

3.6.2 New Materials & Construction Techniques

3.6.3 Increased Collaboration & Knowledge Sharing

3.6.4 Artificial Intelligence & Expert Systems

4. Lifecycle Management and Financial Considerations

4.1 Useful Life

The estimated useful life of bridges depends on the type and material of the bridge.

Table 4.1 - Bridge Useful Lives
Type of Bridge Useful Life
RC Road Bridge 100 Years
RC Footbridge 80 Years
Timber Footbridge 40 Years
Small Timber Footbridge 25 Years

4.2 Condition

The City of Whittlsea appears to use a three point condiiton scoring system for bridges.

  • Good
  • Fair
  • Poor

In May 2003 a general review of bridge condition identified that 3 bridges were in poor condition, 1 was in fair condition, and that the remainder (including all VicRoads bridges) were in good condition.

Bridges are subject to an inspection regime that comprises a bi-annual routine maintenance inspection (Level one) in addition to inspections to assess current condition of the bridges.
The frequency of level two condition inspections is based on the age and known condition of the bridges. That is, older bridges and those that are showing signs of structural deterioration are inspected more frequently (annually) than those with minimal signs of deterioration (up to 5 years)
Level three inspections are drawn from the level two inspection where structures are reported in poor condition, showing signs of accelerated deterioration and where significant work is proposed for a structure.
Level one condition inspections are carried out by the Operations Engineer and Rural Works Foreman twice a year. Level two condition inspections are carried out by the Assets Engineer on a programmed basis up to five years apart. Level three condition inspections are carried out by a qualified Bridge Engineer.

4.3 Valuations

4.3.1 Unit Rates

4.3.2 Valuation

The value of Council's bridges as at 30 June 2011 was as per the table below:

Table 4.3.2 - Bridge Valuation
Replacement Cost Accumulated Depreciation Written Down Replacement Cost
$20,192,725 $3,945,867 $16,246,858

A spreadsheet detailing the value of indicidual bridged is stored in the directory below

4.4 Maintenance

Maintenance work is managed by Operations using Council or contracted resources.
A significant proportion of the bridge maintenance is identified from bridge inspections.

4.4.1 Maintenance Activities Bridge Inspections

4.4.3 Maintenance Expenditure

4.5 Renewal & Replacement

4.5.1 Renewal Treatments

4.5.2 Renewal Expenditure

4.5.3 Intervention Levels

4.6 New Works & Upgrades

4.7 Disposals

4.8 Risk Management

5. Asset Management Practices

5.1 Asset Management Systems

A range of software systems are used to store and manipulate bridge data.

  • The official bridge register is located within Authority;
  • The location of bridges is recorded in the GIS;
  • Additional information is located in various excel spreadsheets on K-drive
  • Data from Authority is imported into the Moloney Asset Management System Bridge Module for analysis.

5.2 Standards & Guidelines

5.3 Work Instructions

5.4 Reporting Requirements

5.4.1 Grants Commission Return

6. Improvement and Monitoring

6.1 Data Quality

6.2 Road data quality mitigation

6.3 Estimate of Reliability

7. References

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