A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Performance-Based Approach for Selection of Overhead Cantilever Sign Support Structures
Overhead sign support structures number in the tens of thousands throughout the trunk-line roadways in the U.S. A recent two-phase study sponsored by the National Cooperative Highway Research Program resulted in the most significant changes to the AASHTO design specifications for sign support structures to date. The driving factor for these substantial changes was fatigue related cracks and some recent failures. This paper presents the results of a subsequent study sponsored by the Michigan Department of Transportation (MDOT) to develop a performance-based procedure to rank overhead sign support structures around the country based on their expected fatigue life and an approximate measure of cost. This was accomplished by combining a random vibrations approach with six degree-of-freedom linear dynamic models for fatigue life estimation. Then, expert opinion of a panel formed especially for this project was used to determine the importance, i.e. weighting, of cost and an optimization function was developed. The optimization function was used to rank selected sign support structures from around the country with the goal of maximizing the optimization function, thus selecting the structures most likely to meet the new AASHTO design criteria. Sixteen possible candidates were considered from around the country.
Performance-Based Approach for Selection of Overhead Cantilever Sign Support Structures
Overhead sign support structures number in the tens of thousands throughout the trunk-line roadways in the U.S. A recent two-phase study sponsored by the National Cooperative Highway Research Program resulted in the most significant changes to the AASHTO design specifications for sign support structures to date. The driving factor for these substantial changes was fatigue related cracks and some recent failures. This paper presents the results of a subsequent study sponsored by the Michigan Department of Transportation (MDOT) to develop a performance-based procedure to rank overhead sign support structures around the country based on their expected fatigue life and an approximate measure of cost. This was accomplished by combining a random vibrations approach with six degree-of-freedom linear dynamic models for fatigue life estimation. Then, expert opinion of a panel formed especially for this project was used to determine the importance, i.e. weighting, of cost and an optimization function was developed. The optimization function was used to rank selected sign support structures from around the country with the goal of maximizing the optimization function, thus selecting the structures most likely to meet the new AASHTO design criteria. Sixteen possible candidates were considered from around the country.
Performance-Based Approach for Selection of Overhead Cantilever Sign Support Structures
van de Lindt, J. W. (author) / Ahlborn, T. M. (author) / Lewis, M. E. (author)
Structures Congress 2004 ; 2004 ; Nashville, Tennessee, United States
Structures 2004 ; 1-8
2004-05-21
Conference paper
Electronic Resource
English
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