091115_bridge maintenance_javad_akhtar

© Hyder Consulting Middle East Ltd Javad Akhtar Technical Director

Maintenance Management of

Bridges and Underpasses

Javad Akhtar - Technical Director - Bridges

15 Nov 2009


The Challenges

• Large proportion of infrastructure built since 1980

• Recognition of particular threats to local infrastructure

• Need increased emphasis to maintenance whilst new construction continues apace

• Need to feedback maintenance issues to improve designs


The Threats

• Environment – Flood, temperature changes, ground

• Breakdown of protective defences – paints, cover

concrete, waterproofing

• Structural Material Deterioration – degradation of

concrete, steel corrosion

• Traffic/Usage – Cyclic-fatigue damage, overloading,

impact

• Human – malicious damage, vandalism

• Failure of Secondary Elements – Parapets, joints,

drains, lights, bearings, monitoring systems


Particular Threats to Structures

in The Middle East• Extreme Temperatures

• Arid environment & salty ground – rapid build up of salts due to evaporation/suction cycle and consequent concrete deterioration.

• Require high integrity waterproofing to protect buried concrete


General Threats – Examples

Impact Damage


Impact


Threats – Ground Conditions,

Cavities


Threats – Hillside Movement


Threats - Earthquake


Threats - Terrorist


Threats - Rockfall


Threats - Landslide


Threats – Flood-Scour


Threats – Poor Workmanship


Threats - Corrosion


So how do we Ensure safety

of our Bridges?

• Data collection about the Bridges

• Establish Routine and Operational

Maintenance Organisation

• Establish a cycle of Condition Inspections,

Load Capacity Assessments and

Refurbishment for Long-term Asset

Management


Steps in attaining Bridge Maintenance Management System

2. Maintenance Operations System Full Asset Management1. Data Collation and

Requirements

Collect and

collate

Structure Data

Requirements

of concerned

external

authorities

ADM

Requirements

and

Management

controls

Basic Structure InventorySuperficial

Inspections

and

Photographs

Maintenance Operations Centre

Inspectors

Works Contractor

Full Bridge Management Database

Implement Principal

Inspections of all Structures

and additional data collection

ADM Asset management

requirements

Procure Principal Inspections

and additional data collection -

surveys

Engineering Management Team


Maintenance Category

• Routine and Operational

Maintenance

• Full Long Term Asset

Management


Routine and Operational Maintenance

Aims

• To keep structure serviceable

• Respond to complaints and queries

• Manage Maintenance Contractor

• Program regular and preventative maintenance

• Emergency responce to accident damage by

“making safe”


• Preventative maintenance

• Innovation in products, equipment and

methods

• Anti-Graffiti coatings

• Durable finishes

• Environmentally friendly lighting and controls

• Automated data capture


Best Value Maintenance Strategies



Essential Data For BMMS/Inventory


• Intelligent Lighting

• Remote Monitoring – automated defect reporting

• Website

• Aesthetic Enhancements

• Integration with Public Transport Systems

• Architectural & Structural Refurbishments


Potential Future Service Developments


Long Term Asset Management

AIMS

• Assurance of Safety

• Assurance of reliable

service availability

• Maintain Asset Value

• Plan for major

refurbishment or

replacement



Approach• Condition Classification of structures using Engineer-

led inspection cycles

• Assessment of the load carrying capacity

• Development of a framework for a bridge management system.

• Asset Valuation and whole-life maintenance cost evaluation to inform decision making

• Planned refurbishment – replacement

• Financial Planning


• Undertake at commencement and annually

• Aim is to visually inspect readily accessible parts of

structure (and particularly critical areas requiring

inspection in-between Principal Inspection cycle)

• Special access equipment or traffic closure usually

avoided

• Establish reference markers for settlement monitoring

• Identify and assess/monitor any cracks


General Inspections


• Undertake every 6-10 years

• Aim is to get within touching distance of all parts of structure

• Special access equipment or traffic closure may be involved

• May need to be done at off-peak traffic period

• Underwater Inspection/bed survey of River Crossings

• Concrete Testing for assessment of reinforcement corrosion risk


Principal Inspections


• Establish condition of the structure

• Evaluate load carrying capacity


Load Assessment


• Assess rate of deterioration

• Evaluate maintenance/refurbishment treatments available and their effectiveness, lifetime and cost

• traffic management costs (accounting for traffic flow rates and the

associated delay costs)

• cost of maintenance in the future discounted to present day values

• implications for safety and traffic flow if the work is not carried out immediately.

• Evaluate Residual Service life with/without refurbishment


Planned Major Refurbishments


• Asset Database

• Inspection Module

• Works Management Module

• Abnormal Load Management

• Deterioration Prediction Models

• Whole Life Costing

• Performance Measures, including Bridge Condition Indicator

• Asset Valuation


Bridge Management System - Components

091115_bridge maintenance_javad_akhtar

Documents

hyder consulting middle

threats environment

maintenance issues

maintenance operations

longterm asset management

structure data requirements

cover concrete

buried concrete