Resumé

Fatigue of reinforced concrete is often not considered for civil engineering structures since the self-weights of reinforced concrete structures are very high (in case of normal strength concrete) while live loads are relatively small, which leads to very small stress variations during service duration of the structure. However, particularly for bridge structures with increased use of high strength concrete and increase in traffic loads, this scenario is reversed and fatigue verification becomes much more important for the safety. This paper presents a probabilistic approach for reliability assessment of existing bridges along with reliability-based calibration of fatigue-design-factors based on the S-N approach, calibration of S-N approach with fracture-mechanics approach and reliability updating using inspections along with a case study for the Crêt de l’Anneau viaduct in Switzerland. It has been observed that, a designer needs to design the structure for fatigue life of 3.5–4.5 times the planned service life, in order to achieve the target annual reliability index of 3.7 at the end of the service life. Further, the presented framework can easily be extended to any other viaducts to estimate the fatigue reliability and maintain the safety level throughout the entire service duration.

OriginalsprogEngelsk
TidsskriftStructure & Infrastructure Engineering
ISSN1573-2479
DOI
StatusE-pub ahead of print - 12 jul. 2019

Fingerprint

viaduct
reliability analysis
Reliability analysis
fatigue
Fatigue of materials
reinforced concrete
Service life
Reinforced concrete
Calibration
Concretes
safety
calibration
fracture mechanics
concrete structure
civil engineering
Civil engineering
Fracture mechanics
Concrete construction
Inspection
services

Emneord

  • Reliability
  • Fatigue
  • Fracture mechanics
  • Reinforced concrete
  • Bridges
  • Calibration

Citer dette

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title = "Fatigue Reliability analysis of Cr{\^e}t De l’Anneau Viaduct: a case study",
abstract = "Fatigue of reinforced concrete is often not considered for civil engineering structures since the self-weights of reinforced concrete structures are very high (in case of normal strength concrete) while live loads are relatively small, which leads to very small stress variations during service duration of the structure. However, particularly for bridge structures with increased use of high strength concrete and increase in traffic loads, this scenario is reversed and fatigue verification becomes much more important for the safety. This paper presents a probabilistic approach for reliability assessment of existing bridges along with reliability-based calibration of fatigue-design-factors based on the S-N approach, calibration of S-N approach with fracture-mechanics approach and reliability updating using inspections along with a case study for the Cr{\^e}t de l’Anneau viaduct in Switzerland. It has been observed that, a designer needs to design the structure for fatigue life of 3.5–4.5 times the planned service life, in order to achieve the target annual reliability index of 3.7 at the end of the service life. Further, the presented framework can easily be extended to any other viaducts to estimate the fatigue reliability and maintain the safety level throughout the entire service duration.",
keywords = "Reliability, Fatigue, Fracture mechanics, Reinforced concrete, Bridges, Calibration, Reliability, Fatigue, Fracture mechanics, Reinforced concrete, Bridges, Calibration",
author = "Amol Mankar and Sima Rastayesh and S{\o}rensen, {John Dalsgaard}",
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T2 - a case study

AU - Mankar, Amol

AU - Rastayesh, Sima

AU - Sørensen, John Dalsgaard

PY - 2019/7/12

Y1 - 2019/7/12

N2 - Fatigue of reinforced concrete is often not considered for civil engineering structures since the self-weights of reinforced concrete structures are very high (in case of normal strength concrete) while live loads are relatively small, which leads to very small stress variations during service duration of the structure. However, particularly for bridge structures with increased use of high strength concrete and increase in traffic loads, this scenario is reversed and fatigue verification becomes much more important for the safety. This paper presents a probabilistic approach for reliability assessment of existing bridges along with reliability-based calibration of fatigue-design-factors based on the S-N approach, calibration of S-N approach with fracture-mechanics approach and reliability updating using inspections along with a case study for the Crêt de l’Anneau viaduct in Switzerland. It has been observed that, a designer needs to design the structure for fatigue life of 3.5–4.5 times the planned service life, in order to achieve the target annual reliability index of 3.7 at the end of the service life. Further, the presented framework can easily be extended to any other viaducts to estimate the fatigue reliability and maintain the safety level throughout the entire service duration.

AB - Fatigue of reinforced concrete is often not considered for civil engineering structures since the self-weights of reinforced concrete structures are very high (in case of normal strength concrete) while live loads are relatively small, which leads to very small stress variations during service duration of the structure. However, particularly for bridge structures with increased use of high strength concrete and increase in traffic loads, this scenario is reversed and fatigue verification becomes much more important for the safety. This paper presents a probabilistic approach for reliability assessment of existing bridges along with reliability-based calibration of fatigue-design-factors based on the S-N approach, calibration of S-N approach with fracture-mechanics approach and reliability updating using inspections along with a case study for the Crêt de l’Anneau viaduct in Switzerland. It has been observed that, a designer needs to design the structure for fatigue life of 3.5–4.5 times the planned service life, in order to achieve the target annual reliability index of 3.7 at the end of the service life. Further, the presented framework can easily be extended to any other viaducts to estimate the fatigue reliability and maintain the safety level throughout the entire service duration.

KW - Reliability

KW - Fatigue

KW - Fracture mechanics

KW - Reinforced concrete

KW - Bridges

KW - Calibration

KW - Reliability

KW - Fatigue

KW - Fracture mechanics

KW - Reinforced concrete

KW - Bridges

KW - Calibration

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