PowerPoint-presentatie

Proof loadingof existing reinforced concrete bridges in The NetherlandsEva Lantsoght, Dick Hordijk, Cor van der Veen, Ane de Boer

Challenge the futureDelftUniversity ofTechnology

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Proof loading of existing reinforced concrete bridges in The Netherlands

Proof loading of bridgesApply predetermined load to bridgeInformation lackingDamage due to ASR,

But: probabilistic analysisMaximum load?Deterministic in load testVariable live load in realityStop criteria?

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Proof loading of existing reinforced concrete bridges in The NetherlandsCurrent codes for proof loadingEurope: DAfStB Richtlinie

North America: Buildings: ACI 437.2M-13Bridges: Manual of Bridge Rating Through Load Testing (1998)

But: stop criteria for cracked structures?

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Proof loading of existing reinforced concrete bridges in The NetherlandsResearch needGuideline for proof loading of existing bridges for The Netherlands

Flexure + shear

Stop criteria? Different for flexure + shear!

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Proof loading of existing reinforced concrete bridges in The NetherlandsMethodsProof load tests:Vlijmen-OostHalvemaans Bridge, AlkmaarRuytenschildt BridgeViaduct in the Zijlweg

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Proof loading of existing reinforced concrete bridges in The NetherlandsVlijmen-OostLoading: BELFAViaduct with ASRTesting while viaduct was in serviceMeasurements:LasersAcoustic emissionsLVDTs

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Proof loading of existing reinforced concrete bridges in The NetherlandsHalvemaans Bridge AlkmaarLoad application: counter weightFlexural capacityBridge closed for 1 nightMeasurements:LasersAcoustic emissionsLVDTs

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Proof loading of existing reinforced concrete bridges in The Netherlands Ruytenschildt Bridge (1)Load application: counter weightMeasurements:LasersAcoustic emissions (2 teams)LVDTsSawcut for testingTesting to failure

More details today 1pm: Recent Developments in Two-way Slabs: Design, Analysis, Construction, and Evaluation

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Proof loading of existing reinforced concrete bridges in The NetherlandsRuytenschildt Bridge (2)Study cracks and deformations for applied loadsCrack formation: acoustic emissions measurementsControl load process

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Proof loading of existing reinforced concrete bridges in The NetherlandsViaduct in the ZijlwegLoading: counter weightViaduct with ASRViaduct closed for 1 weekMeasurements:LasersAcoustic emissionsLVDTs

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Proof loading of existing reinforced concrete bridges in The NetherlandsResults of proof load tests (1)Load application method:Hydaulic jacks: allows higher load on wheel printsBELFA: limited to total load of 90 metric tons

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Proof loading of existing reinforced concrete bridges in The NetherlandsResults of proof load tests (2)Determination of maximum load in test:Moment due to applied load= moment due to Eurocode loadsFind critical locationSame procedure for shearUse LFEA

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Proof loading of existing reinforced concrete bridges in The NetherlandsResults of proof load tests (3)Different reliability levelsAs prescribed by NEN 8700:2011Different requirements for structureDifferent partial load factorsCasePtot (kN)Ptot (metric ton)EC4,3 (?)1259128RBK Design4,31257128RBK Reconstuction + 5%1146117RBK Reconstruction3,6-3,81091111RBK Usage3,31050107RBK Disapproval3,11049107SLS?81583

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Proof loading of existing reinforced concrete bridges in The NetherlandsResults of proof load tests (4)

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Proof loading of existing reinforced concrete bridges in The NetherlandsResults of proof load tests (5)Measurements: experienceDevelopment of aluminum frameResearch on Acoustic EmissionsNecessary for stop criteriaLoad cells at jacks

LVDTLaser distance finder

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Proof loading of existing reinforced concrete bridges in The NetherlandsSummary and conclusionsResearch in The NetherlandsExecuted load testsLoading with hydraulic jacksMeasurement and interpretationCurrent work:Determination of maximum loadStop criteria for bending and shear

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Proof loading of existing reinforced concrete bridges in The Netherlands

Contact:Eva LantsoghtE.O.L.Lantsoght@tudelft.nl // elantsoght@usfq.edu.ec+31(0)152787449

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Proof loading of existing reinforced concrete bridges in The Netherlands