Approach for Establishing Approximate Load Carrying Capacity for Bridges with Unknown

[mahyarov]

Approach for Establishing Approximate Load Carrying Capacity for Bridges
with Unknown Material and Unknown Design Properties

Author: Taylor, Zach Amini, Omar | Size: 4.24 MB | Format: PDF | Quality: Original preprint | Publisher: Colorado State University, Fort Collins | Year: 2011 | pages: 86

There are 16 small to medium simple span bridges in Larimer County that are currently load rated solely based on visual inspections. Most of these bridges are prestressed concrete bridges. The objective of this project is to load rate these bridges using structural analysis with very little to no information available related to their design. Larimer County provided everything available, which essentially was very limited plans and inspection reports for the bridges. The plans lacked details concerning prestress, cross-section dimensions, and material properties. The bridge (prestress concrete) manufacturer does not have records of the bridges built in the 1960’s or earlier. Due to these limitations, a basic structural analysis was performed using a program developed for the Colorado Department of Transportation (CDOT) in 2007 with rating-conservative assumptions in order to determine the capacities of the bridges. The influence of these assumptions on the conclusions is also discussed.

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