Cost-effective Highway Bridge Deck for 100 Year Service Life Juan Tzoc Jr. Dr. Sougata Roy, Department of Civil Engineering, Lehigh University, Bethlehem, PA Motivation •Challenge of maintaining highway bridge decks against time dependent deterioration due to repeated loading from passing vehicles, weather elements, and road salts •Commonly used concrete decks are particularly susceptible to corrosion resulting in recurring maintenance and traffic delays •A prefabricated modular steel orthotropic bridge deck (SOBD) can provide a life cycle cost-effective solution providing a 100 year service life with minimal maintenance Background •Main concern with SOBD is fatigue cracking from various welded connections under repeated loading from vehicular traffic •New design implementing economic fabrication •Need to verify 100 year service life design by laboratory and computer simulations Experiment •Full sized specimen was fabricated and installed in the laboratory •A test set-up was developed to reproduce the boundary conditions •Crawl tests were run to determine the most critical live load disposition •Accelerated testing was conducted under repeated simulated truck loading demonstrating 100 year service life without any detectable fatigue damage Computer Simulation •Finite element models was created on ABAQUS to simulate the laboratory test specimen and entire deck •FE models were compared to measured test results to ensure specimen and laboratory set-up was properly modeled Conclusions and Future Work •The study provided insight in the behavior of an orthotropic bridge deck under truck traffic •Stresses were sufficiently managed so that fatigue cracking in service is unlikely •Develop standardized SOBD for life cycle cost-effective infrastructure solutions Acknowledgements Soham Mukherjee, Frank Artmont, ATLSS Staff References: 1. Roy, Alapati, Manandhar , Fisher. “Measurements of a Steel orthotropic Deck under Crawl Loading.” ASCE Structures Congress 2011. 2. Roy, Alapati, Manandhar , Molina. “Fatigue Resistance Investigation for the Replacement Orthotropic Deck at the Verrazano Narrows Bridge.” ATLSS Report No. 12-01. April 2012. Observations • Deck response was local under wheel loads • Local stress at the welded connections are critical for performance • FEA and physical measurements showed good correlation • Design stresses were low enough to provide 100 year service Principal stress contour plot & deformed shape of inner floor beam
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Cost-effective Highway Bridge Deck for
100 Year Service LifeJuan Tzoc Jr.
Dr. Sougata Roy, Department of Civil Engineering, Lehigh University,
Bethlehem, PA
Motivation
•Challenge of maintaining highway bridge decks against time
dependent deterioration due to repeated loading from passing
vehicles, weather elements, and road salts
•Commonly used concrete decks are particularly susceptible to
corrosion resulting in recurring maintenance and traffic delays
•A prefabricated modular steel orthotropic bridge deck (SOBD)
can provide a life cycle cost-effective solution providing a 100
year service life with minimal maintenance
Background
•Main concern with SOBD is fatigue cracking from various welded
connections under repeated loading from vehicular traffic
•New design implementing economic fabrication
•Need to verify 100 year service life design by laboratory and
computer simulations
Experiment
•Full sized specimen was fabricated and installed in the
laboratory
•A test set-up was developed to reproduce the boundary
conditions
•Crawl tests were run to determine the most critical live load
disposition
•Accelerated testing was conducted under repeated simulated
truck loading demonstrating 100 year service life without any
detectable fatigue damage
Computer Simulation
•Finite element models was created on ABAQUS to simulate the
laboratory test specimen and entire deck
•FE models were compared to measured test results to ensure
specimen and laboratory set-up was properly modeled
Conclusions and Future Work
•The study provided insight in the behavior of an orthotropic
bridge deck under truck traffic
•Stresses were sufficiently managed so that fatigue cracking in
service is unlikely
•Develop standardized SOBD for life cycle cost-effective
infrastructure solutions
AcknowledgementsSoham Mukherjee, Frank Artmont, ATLSS Staff
References:1. Roy, Alapati, Manandhar, Fisher. “Measurements of a Steel
orthotropic Deck under Crawl Loading.” ASCE Structures Congress
2011.
2. Roy, Alapati, Manandhar, Molina. “Fatigue Resistance Investigation
for the Replacement Orthotropic Deck at the Verrazano Narrows
Bridge.” ATLSS Report No. 12-01. April 2012.
Observations
• Deck response was local under wheel loads
• Local stress at the welded connections are critical for
performance
• FEA and physical measurements showed good correlation
• Design stresses were low enough to provide 100 year service
Principal stress
contour plot &
deformed shape of
inner floor beam
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