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Challenge the future
DelftUniversity ofTechnology
Shear and Moment Capacity of the Ruytenschildt Bridge
Eva Lantsoght, Cor van der Veen, Ane de Boer, Karen Flores
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Overview
• Introduction to case• Prediction of capacity• Test results• Discussion• Summary & Conclusions
Slab shear experiments, TU Delft
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Proof loading Case Ruytenschildt Bridge
• Proof loading to assess capacity of existing bridge• ASR affected bridges• Insufficient information
• Study cracks and deformations for applied loads
• Crack formation: acoustic emissions measurements• Control load process
• Ruytenschildt Bridge: testing to failure in 2 spans
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Proofloading Ruytenschildt Bridge
Existing bridge Partial demolition and building new bridge
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Cross-sections Ruytenschildt Bridge
• Testing in span 1 and span 2• close to end support• close to mid support
• Critical position for shear
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Predicted bending moment capacity
Flexural capacity
Span 1 Span 2, support
Span 2, span
Mcr (kNm) 1816 1690 1592My (kNm) 3925 5662 3717Mu (kNm) 4964 7064 4705Corresponding tandem loadPcr (kN) 880 1278 1460Py (kN) 2368 7720 3532Pu (kN) 3102 9940 4496
Moment at cracking, yielding, and ultimate + corresponding tandem load
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Predicted shear capacity
Span Span 1 Span 2Shear capacity
Ptot (kN)
Ptot,slab (kN)
Ptot (kN)
Ptot,slab (kN)
bstr 3760 7606 4020 8132bpara 3236 6546 3432 6943bskew 4804 9718 5328 10779
• Effective width for skewed viaducts?
• Slab factor of 2.023 from slab shear experiments
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ProofloadingCase Ruytenschildt Bridge
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Test results proofloadingSpan 1
• Maximum load 3049 kN• Maximum available load for
span 1• Flexural cracks• No failure• Order additional load for
test 2!
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Test results proofloadingSpan 2
• Maximum load 3991 kN• Large flexural cracks• Flexural failure• yielding of
reinforcement• Settlement of bridge pier
with 1.5cm• Elastic recovery to 8mm
0 2000 4000 6000 8000 100000
500
1000
1500
2000
2500
3000
3500
4000
4500
Time(s)Lo
ad (k
N)
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Discussion
• Loads larger than estimated capacities prior to test• uncertainties about
material properties• Flexure as governing
failure mode• Shear: further research
on skewed slabs is necessary
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Conclusions• Ruytenschildt Bridge• Testing to failure in 2 spans• Measurements
• Shear and moment capacity determined• moment capacity: need for
material parameters• shear capacity: effective width for
skewed slabs?
• Observed failure mode: flexure
