Effective bridge asset management for Local Government. Rudolph Kotze MIEAust, CPEng RPEQ National Technical Leader, ARRB Group Ltd.

Transcription

1 Effective bridge asset management for Local Government Rudolph Kotze MIEAust, CPEng RPEQ National Technical Leader, ARRB Group Ltd.

2 Outline Asset & risk management fundamentals Risks: Condition Loading Environment Levels of service Data capture and management Conclusions 2

3 Code of Hammurabi circa 1750 B.C. If a builder builds a house for a man and does not make its construction firm and the house collapses and causes the death of the owner of the house, that builder shall be put to death 3

4 Background de la Concorde Québec COMMISSION OF INQUIRY the Commission lays most of the blame on the Ministère des Transports du Québec for tolerating ambiguous accountability, for its lack of rigorous record keeping, and for not developing an adequate inspection and maintenance programme despite knowing about the special characteristics of the de la Concorde overpass. 4

5 Background 5 people killed in 2007 Warning signs in 2002 & 2004 but no works undertaken Poor council management systems Coroner blames City Council Failure due to rust of the invert caused erosion The cause of the collapse of the embankment above the culvert was the failure to adequately maintain the culvert. 5

6 Asset management fundamentals Responsibilities of asset owners Knowledge of assets, condition and risks is critical Systematic asset management approach Risk management Inspections (level 2) 6

7 Asset management system Life cycle activities 7

8 Structures information Inventory information Condition information Historic performance Understanding of risks 8

9 Risks faced by civil structures Condition Loading Environment Levels of service Design & construction standards Risk profile 9

10 Condition risk 10

11 Structures information - condition Level 1 routine maintenance Level 2 condition assessment Level 3 detailed engineering inspection 11

12 Condition assessment-level 2 12

13 Loading risks 13

14 Load rating Identification of key routes, including affected assets. Confirmation of specific vehicle rating load to be used. Sourcing of as-built drawings and data. Undertaking structural assessment. Preparation of route/access maps. 14

15 Load rating Comparison with other similar bridge types. Review of research undertaken by state jurisdictions. Evaluation of historical permitted loads as benchmark. Instrumentation and proof loading of structures. 15

16 Environmental risks 16

17 Seismic risks 17

18 Flood and scour risks Inadequate hydraulic design- bridge length. Inappropriate design criteria for protection. Insufficient depth of piles in river channels. In-built scour risks due to location - bends. 18

19 Scour risk assessment 19

20 Environmental risks 20

21 Levels of service Bridge barrier compliance Accident history Existing bridge structural capacity Traffic volumes and vehicles Benefit-cost analysis 21

22 Levels of service Bridge over height strikes Route importance Commercial vehicles Clearances Type of bridge construction Strike history Signage and alternative routes 22

23 Asset management systems 23

24 Structures information - data capture/retention Capture data in Structures Management System Important tool - needs to be fit-for-purpose Essential inventory and condition data Known risks Quality rather than quantity Discreet vs. network view 25

25 Basic structures inventory 26

26 Condition assessment level 2 inspections 27

27 Ability to generate maintenance schedules 28

28 Qualitative risk assessment 29

29 Risk-based maintenance prioritisation 30

30 Valuation and remaining service life 31

31 Tender specifications for L2 inspections General information Inspector experience and qualification Access requirements Safety and environmental Traffic management Timber bridges: To drill or not to drill 32

32 General Information for pre-inspection desktop study Locality plans and as-built drawings Structural data, heights above ground, access requirements Specific deliverables Inspection and final contract report formats Maintenance schedules Load rating of structures specify rating loads Safety and Traffic Management Plans Photographic and electronic data formats 33

33 Inspector experience Specify requirements for inspection staff Relevant experience and track record Engineering qualifications Industry accreditation and training 34

34 UK (Woking) inspection trial 35

35 Access for data collection 36

36 Access requirements Access requirements for visual inspection Vegetation clearance Underbridge Inspection Unit option Two-stage process 37

37 Conclusions Knowledge of assets and risks is critical Systematic approach to asset & risk management Asset risk profile is required Network level risk profile is needed Rational risk-based prioritisation of critical work KISS principle 38