Transcript Issue 4.3.2 – New repair and rehabilitation methods - abr-bwv

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Synthèse des travaux du CT Ponts routiers
Overzicht van de werkzaamheden van het
TC Weggen bruggen
Ir Pierre GILLES
Inspecteur général ff
SPW – DGO1 – Département des Expertises techniques
<POST-SEOUL> Sterrebeek, 18.03.2016
Issues TC Road bridges
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Issue 4.3.1 - Adaptation to climate change
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Identify the technical aspects of road bridges subject to
adaptation to climate change taking into consideration the
assessment produced by Working Group II: Impacts, Adaption and
Vulnerability of the Intergovernmental Panel on Climate Change,
IPCC.
Issue 4.3.2 – New repair and rehabilitation methods
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Examine several degradation problems that can occur on bridges
and compare different innovative repair and rehabilitation
methods that can be applied to solve these problems. Methods can
be innovative by the technique, the way to take traffic into
account and/or the reduction of the ecological footprint.
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Issues TC Road bridges
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Issue 4.3.3 - Risk-based management of the bridge stock
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Review how risk management is used in the management of bridge
stock.
Investigate the existing tools and identify best practice approach
for structures sensitive to each hazard.
Issue 4.3.4 - Estimation of load carrying capacity of bridges
based on damage and deficiency
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Analyze existing estimation methods of load carrying capacity of
bridges based on damage and deficiency.
Identify best practice approach for the use of data in supporting
the estimation of load carrying capacity for reducing damage and
deficiency.
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Reports
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4 reports will be available on www.piarc.org
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Actually only :
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Issue 4.3.2 – New repair and rehabilitation methods
Issue 4.3.4 - Estimation of load carrying capacity of bridges
based on damage and deficiency
Focus on :
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Issue 4.3.2 – New repair and rehabilitation methods
Issue 4.3.3 - Risk-based management of the bridge stock
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I. New repair and rehabilitation methods
Old +
degradation
Many
Bridges
Less
budget
New
rehabilitation
methods
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New repair and rehabilitation methods
TC – group 2 members imagine 22 real degradation
problems
 Ask PIARC members for solutions
 Compare solutions from different countries
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Purpose :
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Guidelines for solutions comparaison
Innovation
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Technical aspects
Trafic impact
Ecological footprint
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How to compare rehabilitation solution ?
6 parameters
3 cotation levels :
+, +/-, Base on
RAMS
Qualitative
comparison
Road
administration or
Contractor
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Parameters
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Reliability
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Availability
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Technical performance of the method
Comply with specification requirements
Throughout the bridge’s lifetime
Traffic hindrance impose by the rehabilitation method
Maintainability
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Minimal maintenance or monitoring during its service life
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Parameters
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Safety
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Finance
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Safe in execution and use?
Specific safety procedures to be followed during the execution,
the inspection and/or the maintenance of the rehabilitation
method ?
Is the method acceptably viable, taking account of both initial and
lifecycle costs ?
Sustainability
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Impact of this rehabilitation method compared to others on the
lifecycle of the bridge?
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Results
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12 countries propose :
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59 standard method
48 innovative method
Conclusion:
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Preserve the structures instead of replace part
of them. Cathodic protection is a good example.
Frequent use in some countries of fibre reinforced
polymer (FRP) plates or sheets (+ sometimes post-tensioning).
If partial replacement => new options : lightweight or high performance
concrete, or reinforcement with fibres.
Innovation must become more numerious and more ambitious
Quality assessment of the product or the method remains not applied
enough
In a large majority of coutries, the rehabilitation method is selected by
the road administration
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II. Risk management embedded in bridge management
Common goal
 Ensure the safety and serviceability of bridges at a
minimum cost
 Implicit or explicit integration in management activities
 Design, inclusion of feedback
 Evaluation, prioritization, and programming operation
and maintenance
 Inspection strategy, surveillance and monitoring
 Responses to vulnerabilities and hazards
 Operating measures, structural assessment,
investigations and operation/maintenance
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Examples of applications in different countries
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Belgium-Wallonia
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In all cases
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Optimal frequency of detailed inspections with respect to specific
hazards or structures
Formal or informal risk-based analyses interfering the bridge
management system
Sétra - CEREMA methodology (France)
 Screen out a large number of structures
facing a set of risks to select those in need
for further investigation
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Risk
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«A potential hazard or threat, more or less predictable, which
may affect the performance of a structure»
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A combination of the hazard and the magnitude of consequences
The expected value (cost) of the consequences
May be assessed by three factors
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Hazards
Vulnerability
Consequences
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Hazard
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Source of risk
4 types : Aging materials
Initial defects
Natural phenomena
Phenomena of human origin
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Vulnerability
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The sensitivity of a structure to hazards
Depends on the structure and the hazard itself
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Intrinsic with respect to unknown hazards
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E.g., a light steel structure is vulnerable to fire, but not
earthquakes
Ability to resist unknown impact
(Almost) opposite of robustness
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Low intensity hazards do not lead to disproportionate
consequences
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Consequences
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Risk evaluation
Hazard
Vulnerability
Consequence
Criticity
Risk
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117 Isostatic precast post-tensioned concrete girder
bridges (France)
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Insufficient bearing capacity due to corrosion of pre-stressing
steel
Hazard criteria
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Initial error:
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Internal hazards:
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Design;
Initial pre-stressing;
Construction (grounting, tendons quality)
Current pre-stressing condition (corrosion) ;
Bridge maintenance (waterproofing replacement) ;
Environment (chlorides) ;
Condition
Three categories of risk : from low (R1) to high (R3) risk
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117 Isostatic precast post-tensioned concrete girder
bridges (France)
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Results
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30 out of 117 bridges ranked as R3
All bridges built before 1960 were R3
Actions required for R2 and R3
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Modification of surveillance programs
Advanced calculation of structural performance
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Climate change as a risk
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Hazards
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Vulnerability
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Temperature rise, cyclones, rainfall, sea level rise, etc.
Costs of considering these in design vary considerably !
Parameters related to technical and cultural evolution
Analysis of climate trends, updating regulations and constant
monitoring of data
Consequences
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Economic impact is huge and largely underestimated
Impossible to estimate a cost on all factors
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New cycle issues
Issue D.3.1 : Bridge design for inspection and maintenance
Issue D.3.2 : Technical and economic considerations of bridge
rehabilitation methods
Issue D.3.3 : Inspections and damage assessment techniques
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Thank you for your attention
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