Static and dynamic characterization of tied arch bridges

<p>"Tied arch bridges have been designed and constructed since the late 19th century. With their open vista owing to minimalist features tied arch bridges continue to appeal the public. Tied arch bridges are both aesthetic and economical alternates to long span bridges holding a place in the hierarchy of major bridges. They fit in a niche between viable and economical plate girder spans and short cable stayed bridge spans. There are several variations of the tied arch with the most common form being those having vertical hangers, stiff tie girders and slender arch ribs. This tied arch variation is examined in-depth using three-dimensional finite element analysis to determine both static and dynamic characteristics. Moreover, contemporary evolutions and innovations are presented as are comparisons between Load Factor Design and Load and Resistance Factor Design.</p><p>Four bridges, all spanning major rivers in the Midwest, are at the core of this study. The bridges have different spans, widths, arch rise, hanger number and spacing as well as wind bracing arrangements. The spans for these bridges range from 535 feet to just over 900 feet. The weight of structural steel per square foot of bridge deck ranges from 111 lb_f/square feet to 184 lb_f/square feet. The total dead load ranges from 244 lb_f/square feet to 311 lb_f/square . Though there is an increase in the live load for the current AASHTO LRFD code over those codes used to design these bridges, the older member sections have acceptable capacity-demand ratios. This is especially true for bridges designed using the HS20 modified live load. The fundamental frequency for the bridges ranges from 0.282 Hz to 0.514 Hz with a corresponding mode shape of a full sine wave. Additional frequencies and mode shapes are reported based on their mass participation. The influence of key element stiffness on frequency is also examined"--Abstract, page iii.</p>

Name thesis:degree_name

Ph. D. in Civil Engineering

Grantor

Missouri University of Science and Technology

Author dc:creator

• Finke, John Edward

• Bridge
• Dynamics
• Tied Arch
• Civil Engineering

Repository record dc:identifier

https://scholarsmine.mst.edu/doctoral_dissertations/2535

OAI identifier oai:identifier

oai:scholarsmine.mst.edu:doctoral_dissertations-3540