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Challenge the future
Delft
University of
Technology
Proof load testing in the Netherlands
Eva Lantsoght
Overview of curren...
2
Overview
• Introduction
• Why proof loading?
• Existing guidelines?
• Pilot proof load tests
• Laboratory experiments
• ...
3
Why load testing? (1)
Bridges from 60s and 70s
The Hague in 1959
Increased live loads
common heavy and long truck (600 k...
4
Safety philosphy of proof load testing
• Safety philosophy
• Stop criteria:
• Further loading not permitted
• Failure ne...
5
Existing Guidelines for proof loading
• Europe: DAfStB Richtlinie
• Originally derived for
buildings
• Plain and reinfor...
6
Existing Guidelines for proof loading
• North America:
• Buildings: ACI 437.2M-13
• Bridges: Manual of Bridge
Rating Thr...
7
Research need
• Guideline for proof loading of existing RC slab bridges for
the Netherlands
• Flexure + shear
• Measurem...
8
TU Delft Proof Load Tests
• Proof load tests:
• Heidijk 2007
• Medemblik 2009
• Vlijmen-Oost 2013
• Halvemaans Bridge 20...
9
Beam tests
• Ruytenschildt beams
• Cyclic loading protocol
• Analysis of stop criteria
• Beams with plain bars
• Effect ...
10
Preparation steps (1)
• Preliminary inspection and
rating
• Determination of dimensions
• Live load: EN 1991-2:2003
• R...
11
Preparation steps (2)
• Critical position
• Bending moment: largest
moment
• Shear: 2.5d from support
• Required proof ...
12
Preparation steps (3)
• Sensor plan:
• Deflection profiles in longitudinal
and transverse direction
• Deflection at sup...
13
Execution steps (1)
• Cyclic loading scheme
• Acoustic emission measurements
• Check linearity and reproducibility of m...
14
Execution steps (2)
15
Analysis Steps (1)
• Data analysis
• Correct for T
• Correct for support
displacements
• Make final plots for report
16
Discussion and future research
• Minimum measurements
• “Quick and easy” method
for practice
• Improvement of stop crit...
17
Summary and conclusions
• Proof loading to approve existing
bridges, also for shear
• Pilot proof load tests in the Net...
18
Contact:
Eva Lantsoght
E.O.L.Lantsoght@tudelft.nl // elantsoght@usfq.edu.ec
+31(0)152787449
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Proof load testing in the Netherlands - overview of current research

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presentation given at ACI Spring Convention 2017 during 437 meeting

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Proof load testing in the Netherlands - overview of current research

  1. 1. Challenge the future Delft University of Technology Proof load testing in the Netherlands Eva Lantsoght Overview of current research
  2. 2. 2 Overview • Introduction • Why proof loading? • Existing guidelines? • Pilot proof load tests • Laboratory experiments • Recommendations • Preparation of proof load tests • Execution of proof load tests • Analysis of proof load tests • Summary and conclusions Slab shear experiments, TU Delft
  3. 3. 3 Why load testing? (1) Bridges from 60s and 70s The Hague in 1959 Increased live loads common heavy and long truck (600 kN) End of service life + larger loads
  4. 4. 4 Safety philosphy of proof load testing • Safety philosophy • Stop criteria: • Further loading not permitted • Failure near • Irreversible damage near MSc Thesis W. Vos
  5. 5. 5 Existing Guidelines for proof loading • Europe: DAfStB Richtlinie • Originally derived for buildings • Plain and reinforced concrete • For flexure
  6. 6. 6 Existing Guidelines for proof loading • North America: • Buildings: ACI 437.2M-13 • Bridges: Manual of Bridge Rating Through Load Testing (1998) • ACI 437.2M-13: • Proof load testing load combination • Acceptance criteria for flexure • Cyclic loading protocol
  7. 7. 7 Research need • Guideline for proof loading of existing RC slab bridges for the Netherlands • Flexure + shear • Measurements? Target proof load?
  8. 8. 8 TU Delft Proof Load Tests • Proof load tests: • Heidijk 2007 • Medemblik 2009 • Vlijmen-Oost 2013 • Halvemaans Bridge 2014 • Ruytenschildt Bridge 2014 • Viaduct Zijlweg 2015 • Viaduct De Beek 2015 Load test to failure of Ruytenschildt Bridge, summer 2014
  9. 9. 9 Beam tests • Ruytenschildt beams • Cyclic loading protocol • Analysis of stop criteria • Beams with plain bars • Effect of number of cycles • Effect of loading speed • Load levels • Analysis of stop criteria Beams RSB01 after failure (Yang, 2015) Yang, Y. (2015). "Experimental Studies on the Structural Behaviours of Beams from Ruytenschildt Bridge," Stevin Report 25.5-15-09, Delft University of Technology, Delft, 76 pp. Beams RSB02B after failure (Yang, 2015)
  10. 10. 10 Preparation steps (1) • Preliminary inspection and rating • Determination of dimensions • Live load: EN 1991-2:2003 • RBK load levels • Different β • Different load factors
  11. 11. 11 Preparation steps (2) • Critical position • Bending moment: largest moment • Shear: 2.5d from support • Required proof load • Same shear or bending moment as with load combination • Value → considered safety level
  12. 12. 12 Preparation steps (3) • Sensor plan: • Deflection profiles in longitudinal and transverse direction • Deflection at supports • Strain on bottom of cross-section • Reference strain measurements to correct for T • Opening existing cracks • Opening new cracks • Applied load => load cells • Acoustic emission measurements (current research)
  13. 13. 13 Execution steps (1) • Cyclic loading scheme • Acoustic emission measurements • Check linearity and reproducibility of measurements • Check residual deformations => no non-linearity • Load levels ≈ safety levels CC3 RBK: • Low level to check instrumentation • SLS • Intermediate level • Target proof load
  14. 14. 14 Execution steps (2)
  15. 15. 15 Analysis Steps (1) • Data analysis • Correct for T • Correct for support displacements • Make final plots for report
  16. 16. 16 Discussion and future research • Minimum measurements • “Quick and easy” method for practice • Improvement of stop criteria for shear • Draft guidelines submitted to RWS in December
  17. 17. 17 Summary and conclusions • Proof loading to approve existing bridges, also for shear • Pilot proof load tests in the Netherlands + beam tests • Current recommendations • First draft guidelines for practice submitted Viaduct Zijlweg
  18. 18. 18 Contact: Eva Lantsoght E.O.L.Lantsoght@tudelft.nl // elantsoght@usfq.edu.ec +31(0)152787449

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